Openvpn link mtu is used inconsistently local link mtu 1569 remote link mtu 1570 6. I am using OpenVPN 2. The local and remote VPN endpoints must exist within the same 255. J Webster 2012-08-15 12:15:58 UTC. Using OpenVPN For Android, I'm having the following alerts, although I can connect, I have no response from any internal IP Connection establish usury systems. WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1449', remote='link-mtu 1421' Option inconsistency warnings triggering disconnect due to --opt-verify Any reason why the OpenVPN called --mtu-test kind regards, David Sommerseth. I receive the following warnings in the router system log that I am having trouble fixing. 2 ECDHE-RSA-AES256-GCM-SHA384, 2048 bit RSA: 1537 One thing that is also pretty odd is: The OpenVPN documentation recommends leaving tun-mtu and link-mtu to defaults and use mssfix and fragmentation options instead. 212:10248 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' 2022-04-22 17:07:37 109. warn openvpn-server1[11595]: ip_address:port WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1464', remote='link-mtu 1521' Aug 13 12:17:11 ROUTER Please use the [oconf] BB tag for openvpn Configurations. 250. 50, remote=255. 193. 'link-mtu' is used inconsistently, local='link-mtu 1573', remote='link-mtu 1541' Mon Jul 28 19:23:18 2014 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' Mon Jul 28 19:23:18 2014 Data Channel Encrypt: Cipher 'BF-CBC' initialized with 128 bit key But I can only access local internet and openvpn server machine. yy. enterprise business solutions; ↳ The OpenVPN Access Server; ↳ CloudConnexa (previously OpenVPN Cloud) ↳ OpenVPN Connect (Windows) ↳ OpenVPN Connect (macOS) ↳ OpenVPN Connect (Android) ↳ OpenVPN Connect (iOS) Off Topic, Related; Braggin' Rights; ↳ My VPN; ↳ Doh! Pay OpenVPN Service Provider Reviews/Comments OpenVPN Inc. I am not currently using any of these. 0/16 --log-driver json-file --log-opt max-size=10m -p 9091:9091 haugene/transmission-openvpn" Current Behavior. port 4567 proto udp sndbuf 0 rcvbuf 0 dev tun Using OpenVPN For Android, I'm having the following alerts, although I can connect, I have no response from any internal IP Connection establish usury systems. when connecting to my OpenVPN I am getting the following warnings in the client log: Sat Mar 09 06:52:57 2019 WARNING: 'link-mtu' is used inconsistently, local='link-mtu I read that it is not recommended to lower the link-mtu or tun-mtu, so I don't think lowering to 1472 should be tried. . WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1449', remote='link-mtu 1421' Option inconsistency warnings triggering disconnect due to --opt-verify Any reason why the May 13 07:39:28 ovpn-client1[14184]: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1606', remote='link-mtu 1634' WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1504', remote='tun-mtu 1532' somebody said: Re: Annoying warning Post by janjust » Tue May 31, 2011 3:06 pm this warning is there for a reason: remove May 13 07:39:28 ovpn-client1[14184]: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1606', remote='link-mtu 1634' WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1504', remote='tun-mtu 1532' somebody said: Re: Annoying warning Post by janjust » Tue May 31, 2011 3:06 pm this warning is there for a reason: remove When I launch my . port WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1544', remote='link-mtu 1536'' 2011-09-09 22:59:01+0300 [-] OVPN 0 OUT: 'Fri Sep 9 19:59:01 2011 IP:port WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1500', remote Code: Select all server 10. Is it Hi, I always have this Warning when I connect iphone or android to OpenVPN server : WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1569', remote WARNING: 'keysize' is used inconsistently, local='keysize 128', remote='keysize 256' I use Torguard VPN (CBC256/SHA512) on AC86U, Merlin 382. "ping -M do -4 -c 1 -s 1472 www. ios_1. 2021-08-26 15:04:53 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1582', remote='link-mtu 1569' 2021-08-26 15:04:53 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' 2021-08-26 15:04:53 WARNING: 'comp-lzo' is Thu Nov 21 17:15:01 2024 172. 4 and newer will usually negotiate to upgrade to the AES-GCM cipher, which is far more efficient on most modern hardware. TCP. View Original Server Config. 4. 7-4 peer info: IV_VER=3. 158. xxx. 77:36953 WARNING: 'mtu-dynamic' is present in remote config but missing in local config, remote='mtu-dynamic' Aug 26 Please use the [oconf] BB tag for openvpn Configurations. Using newer 2. WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1449', remote='link-mtu 1421' Option inconsistency warnings triggering disconnect due to --opt-verify Any reason why the 连接到我的 OpenVPN 时，我在客户端日志中收到以下警告： Sat Mar 09 06:52:57 2019 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1469', remote='link-mtu 1569' Sat Mar 09 06:52:57 2019 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu Using OpenVPN For Android, I'm having the following alerts, although I can connect, I have no response from any internal IP Connection establish usury systems. Moderators: TinCanTech 'link-mtu' is used inconsistently, local='link-mtu 2028', remote='link-mtu 1528' Tue May 17 18:54:31 2011 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 2000', remote='tun-mtu 1500' don't specify 'tun-mtu 2000' in the Openvpn questions - Installing and Using OpenWrt - OpenWrt Forum Loading Business solution to host your own OpenVPN server with web management interface and bundled clients. Community Project , key-method 2,tls-client' 2017-08-20T23:38:36+00:00 RV50 openvpn-1[8692] Expected Remote Options String: 'V4,dev-type tun,link-mtu 1573,tun-mtu 1500,proto UDPv4,mtu-dynamic,cipher AES-128-CBC,auth SHA256,ke ysize 128,key-method 2,tls-server' 2017-08-20T23:38:36+00:00 RV50 openvpn-1 Please use the [oconf] BB tag for openvpn Configurations. Sat Nov 12 09:09:54 2011 us=23000 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1526', remote='link-mtu 1558' 'link-mtu' is used inconsistently, local='link-mtu 1526', remote='link-mtu 1558' How to set tun-mtu/link-mtu/mssfix? Post by nobaq » Mon Mar 16, 2020 6:52 pm Hi, I am using OpenVPN 2. I also know that -fragment option is not applicable to the How can I fix both of these warnings? I know that the tun and link mtu are related to each other, however, I noticed locally they are 50 bytes apart, while remotely they are 69 bytes apart. 8. 'link-mtu' is used inconsistently, local='link-mtu 1558', remote='link-mtu 1590' 2020-12-20 20:27:11 us=26874 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1500', remote='tun-mtu 1532' 2020-12-20 20:27:11 us=27855 Control Channel: TLSv1, cipher SSLv3 DHE-RSA-AES256-SHA Sat Mar 25 20:20:23 2017 WARNING: using --fragment and --mtu-test together may produce an inaccurate MTU test result Sat Mar 25 20:20:24 2017 TCP/UDP: Preserving recently used remote address: [AF_INET]95. The alerts are: 'dev-type' is used inconsistently, Local = 'dev-type tap' 'link-mtu' is used inconsistently, Local = 'link-mtu1542' remote = 'link-mtu 1547' My first hunch is I should use parameters like : " link-mtu, tun-mtu, mssfix and maybe more ". 176. I'm seeing this warning in the server-side log when using the OpvenVPN Connect app for iOS: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1602', remote='link-mtu 1603' The clien Please use the [oconf] BB tag for openvpn Configurations. 25:10240 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1338', remote='tun-mtu 1418 Hello, I have an OpenVPN 2. Expected Remote Options String (VER=V4): 'V4,dev-type tun,link-mtu 1550,tun-mtu 1500, May 13 07:39:28 ovpn-client1[14184]: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1606', remote='link-mtu 1634' WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1504', remote='tun-mtu 1532' somebody said: Re: Annoying warning Post by janjust » Tue May 31, 2011 3:06 pm this warning is there for a reason: remove May 13 07:39:28 ovpn-client1[14184]: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1606', remote='link-mtu 1634' WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1504', remote='tun-mtu 1532' somebody said: Re: Annoying warning Post by janjust » Tue May 31, 2011 3:06 pm this warning is there for a reason: remove May 13 07:39:28 ovpn-client1[14184]: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1606', remote='link-mtu 1634' WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1504', remote='tun-mtu 1532' somebody said: Re: Annoying warning Post by janjust » Tue May 31, 2011 3:06 pm this warning is there for a reason: remove Please use the [oconf] BB tag for openvpn Configurations. 117:443 Jan 3 11:49:37 unknown daemon. 1 2021/10/08 09:02:01 WARN dns over tls: DNS Using OpenVPN For Android, I'm having the following alerts, although I can connect, I have no response from any internal IP Connection establish usury systems. I couldn't find where the problem is. The alerts are: 'dev-type' is used inconsistently, Local = 'dev-type tap' 'link-mtu' is used inconsistently, Local = 'link-mtu1542' remote = 'link-mtu 1547' Hi All. conf Hello. correct i use the same command. OpenVPN credentials were created on the server at various times, running various CU versions, including today (CU v. 3. xxx:9200 Tue May 31 11:55:03 2011 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this Tue May 31 11:55:08 2011 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1542', remote='link-mtu 1574' Please use the [oconf] BB tag for openvpn Configurations. The alerts are: 'dev-type' is used inconsistently, Local = 'dev-type tap' 'link-mtu' is used inconsistently, Local = 'link-mtu1542' remote = 'link-mtu 1547' One thing that is also pretty odd is: The OpenVPN documentation recommends leaving tun-mtu and link-mtu to defaults and use mssfix and fragmentation options instead. 139. So this warning is misleading. Moderators: TinCanTech, TinCanTech, TinCanTech, 'link-mtu' is used inconsistently, local='link-mtu 1554', remote='link-mtu 1550' Thu May 11 11:37:03 2023 WARNING: 'auth' is used inconsistently, local='auth SHA256', remote='auth [null-digest]' Thu May 11 11:37: Code: Select all IV_GUI_VER=net. 168. key comp-lzo verb 3 ;link-mtu 1472 fragment 1400 mssfix ;mtu-test Wed Aug 15 13:09:36 2012 WARNING: No server certificate verification method has When connecting to my OpenVPN server with iOS, I get the following lines in the router's logs. 0. 24. The AC1900 connects and routes all traffic to an OpenVPN tunnel. hostname openvpn[15260]: TCPv4_SERVER link local (bound): [AF_INET]xx. Therefore seeking help from community, basically what to do when MTU size on both ends differs ? As a side note openvpn 2. X:31945 Control Channel: TLSv1. If enter the container I cannot push a 1500 byte frame through the port. 0]. Try 'openvpn --show-valid-subnets' option for more info. I rather not have any warnings. x apparently leaves the (unused) auth in its settings. 242. 3 and 2. 4 is used on debian stretch platforms ( client: regular PC and server: NanoPiNEO2 ) 1/ hello, I've searched everywhere but I see that there is no mtu change in the wan settings, the problem is that there is a loss of packets in the openvpn connection, WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1601', remote='link-mtu 1581' Aug 12 21:38:29 vpnclient5[5251]: WARNING: 't 2021/10/08 11:14:57 WARN openvpn: 'link-mtu' is used inconsistently, local='link-mtu 1633', remote='link-mtu 1634' 2021/10/08 09:14:56 WARN openvpn: 'comp-lzo' is present in remote config but missing in local config, remote='comp-lzo' 2021/10/08 09:02:01 INFO dns over tls: falling back on plaintext DNS at address 1. 3, cipher TLSv1. ovpn" I receive three warnings that I am having trouble fixing. 7 and server is 2 Please use the [oconf] BB tag for openvpn Configurations. key dh dh1024. 0 (64 bit) on Windows 7 Ultimate (64 bit). 5. Moderators: TinCanTech 'link-mtu' is used inconsistently, local='link-mtu 1604', remote='link-mtu 1572' Sun Mar 31 14:31:40 2019 127. 66. 141:31792 WARNING: ‘cipher’ is used inconsistently, local=‘cipher BF-CBC’, remote=‘cipher AES-128-CBC’ WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1550', remote='link-mtu 1558' OpenVPN 2. Jul 29 04:08:38 openvpn 36204 68. X OpenVPN clients does not work. xxx:9200 Tue May 31 11:55:03 2011 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this Tue May 31 11:55:08 2011 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1542', remote='link-mtu 1574' Fri May 20 19:29:56 2011 UDPv4 link remote:xxx. 6:58768 WARNING: 'cipher' is used inconsistently, local='cipher AES-256-CBC', remote='cipher AES-256-GCM' Wed Apr Tue May 31 11:55:01 2011 UDPv4 link remote: 64. 2, cipher SSLv3 DHE-RSA-AES256-SHA, 4096 bit RSA My first hunch is I should use parameters like : " link-mtu, tun-mtu, mssfix and maybe more ". remote x. 'link-mtu' is used inconsistently, local='link-mtu 1558', remote='link-mtu 1590' 2021-08-02 16:58:51 us=392832 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1500', remote='tun-mtu 1532' 2021-08-02 16:58:51 us=393788 Control Channel: TLSv1, cipher SSLv3 DHE-RSA-AES256-SHA 2023-11-9 01:00:07 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1549', remote='link-mtu 1541' 'link-mtu' is used inconsistently, local='link-mtu 1549', remote='link-mtu 1541' these warnings are no longer logged with OpenVPN version >2. 0 dev tun port 11094 proto udp #tun-mtu 1500 #fragment 1300 #mssfix ca ca. Please use the [oconf] BB tag for openvpn Configurations. 'link-mtu' is used inconsistently, local='link-mtu 1586', remote='link-mtu 1578' Thu Oct 4 07:32:33 2018 WARNING: 'cipher' is used inconsistently, local='cipher AES-256-GCM', remote='cipher BF-CBC' Thu Oct 4 07:32:33 2018 WARNING: 'auth' is used inconsistently, local='auth [null I keep getting the following warnings from my OpenVPN client and I'd prefer to fix them so it stops filling up my logs. 'link-mtu' is used inconsistently, local='link-mtu 1574', remote='link-mtu 1542' Sun Jul 7 02:08:13 2013 us=192501 84. x 1194;remote my-server-2 1194 # Choose a random host from the remote # list for load-balancing. I need 2. WARNING: peer-id set, but link-mtu fixed by config - reducing tun-mtu to 1383, expect MTU problems (currently it is 1306) Mon Jan 30 11:56:59 2017 130. (4292). 0 255. WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1449', remote='link-mtu 1421' Option inconsistency warnings triggering disconnect due to --opt-verify Any reason why the Please use the [oconf] BB tag for openvpn Configurations. x codebase sets auth to 'none' when AEAD ciphers are used, because the auth is already provided by the cipher. I even set the tap0 device to 1500 under Network> Interfaces > Devices to 1500. Here is what a client logs: OpenVPN: NOTE: Empirical MTU test completed [Tried,Actual] local->remote=[1512,1512] remote->local=[1461,1461] Please use the [oconf] BB tag for openvpn Configurations. 255 Please use the [oconf] BB tag for openvpn Configurations. 6 x86_64-w64-mingw32 [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [AEAD] built on Apr 26 2018 'link-mtu' is used inconsistently, local='link-mtu 1552', remote='link-mtu 1572' Mon May 21 23:12:13 2018 WARNING: 'cipher' is used inconsistently, local='cipher AES-256-GCM', remote='cipher AES-256-CBC' -e OPENVPN_PASSWORD=pass -e LOCAL_NETWORK=192. notice openvpn[1149]: TCPv4_CLIENT link remote: [AF_INET]50. Users are prompted for private key Hi, it happened to me that on the OpenVPN server there is MTU9000 and clients cannot figure out that properly. crt key key. enterprise business solutions; ↳ The OpenVPN Access Server; ↳ CloudConnexa (previously OpenVPN Cloud) ↳ OpenVPN Connect (Windows) ↳ OpenVPN Connect (macOS) ↳ OpenVPN Connect (Android) ↳ OpenVPN Connect (iOS) Off Topic, Related; Braggin' Rights; ↳ My VPN; ↳ Doh! Pay OpenVPN Service Provider Reviews/Comments Hi everybody, I have some problem to set up openvpn in linux, I guess it's a mtu problem. 3 TLS_AES_256_GCM_SHA384, peer certificate: Quick links. Error persists only on Server. I'm trying to make the dev TUN implementation of OpenVPN act as though it were plugged into an Ethernet port on my LAN. client dev tun proto tcp verify-x509-name "[]" route remote_host 255. 3063]: 44. IV_SSO=webauth,openurl 2022-11-26 12:48:03 X. 213:34765 WARNING: 'tun-mtu' is used inconsistently, Quick links. Per Spectrum, who recently updated my modem and router, I had Using OpenVPN For Android, I'm having the following alerts, although I can connect, I have no response from any internal IP Connection establish usury systems. WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1449', remote='link-mtu 1421' Option inconsistency warnings triggering disconnect due to --opt-verify Any reason why the Note that it will do for all traffic (not just TCP) originating from the client, because the link-mtu value is used by OpenVPN as an upper-bound size for its own (UDP port 1194) payloads sent to the remote endpoint, hence the remote client's actual MTU (as discovered manually) minus 20 (outer IP header size without options) minus 8 (outer UDP Please use the [oconf] BB tag for openvpn Configurations. The problem is: All clients will likely have some incompatible settings because Openvpn is free and nobody has the time to make this work as intended. 3_2 sitting behind a separate Spectrum wireless router and a separate Spectrum cable modem. 2) I'm getting MTU warnings saying the client and server don't match. xxx:9200 Fri May 20 19:29:57 2011 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this Fri May 20 19:30:06 2011 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1526', remote='link-mtu 1562' WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1633', remote='link-mtu 1634' WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' WARNING: 'cipher' is present in local config but missing in remote config, local='cipher AES-256-CBC' WARNING: 'comp-lzo' is present in remote config 当连接到我的OpenVPN时，我在客户机日志中得到以下警告：Sat Mar 09 06:52:57 2019 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1469', remote='link-mtu 1569'Sat Mar 09 06:52:57 2019 WARNING: 'tun-mtu' is used inco I had to comment out option data_ciphers_fallback 'CHACHA20-POLY1305' as it causes the config to disappear from the OpenVPN Luci interface. 1:553: P_ACK_V1 kid=0 [ 6 ] 1536: Control Channel: TLSv1. 4 is used on debian stretch platforms ( client: regular PC and server: NanoPiNEO2 ) 1/ OpenVPN Inc. The alerts are: 'dev-type' is used inconsistently, Local = 'dev-type tap' 'link-mtu' is used inconsistently, Local = 'link-mtu1542' remote = 'link-mtu 1547' WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1590', remote='link-mtu 1558' 1534: WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' 1535: UDP WRITE [22] to [AF_INET]1. xxx:9200 Tue May 31 11:55:03 2011 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this Tue May 31 11:55:08 2011 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1542', remote='link-mtu 1574' I use openvpn with my own server and it's work(as a proxy). Moderators: TinCanTech 'link-mtu' is used inconsistently, local='link-mtu 1574', remote='link-mtu 1542' 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' Now that's strange because dev-type was tap Tue Jan 15 04:45:34 2019 WARNING: 'comp-lzo' is present in remote config but missing in local config, remote='comp-lzo' For this Warning my settings on pfSense is lz4-v2 and I have ticked also Push Compression I am not sure why this option is not exported into my client config file. For example HackTheBox or TryHackMe. notice openvpn[1149]: TLS: Initial packet from [AF_INET]50. 77:43198 WARNING: 'mtu-dynamic' is present in remote config but missing in local config, remote='mtu-dynamic' OpenVPN Inc But nothing seems to work. WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1560' Please use the [oconf] BB tag for openvpn Configurations. Thu Feb 16 08:57:45 2017 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1369', remote='link-mtu 1370' Thu Feb 16 08:57:45 2017 WARNING: 'comp-lzo' is present in remote config but missing in local config, remote='comp-lzo' Code: Select all client dev tap #dev-node MyTAP #If you renamed your TAP interface or have more than one TAP interface then remove the # at the beginning and change "MyTAP" to its name proto udp remote 8*. 'link-mtu' is used inconsistently, local='link-mtu 1560', remote='link-mtu 1544' Sat Nov 01 10:25:50 2014 us=347813 WARNING: 'cipher' is used inconsistently, local='cipher AES-128-CBC', remote='cipher BF-CBC' Sat Nov 01 10:25:50 2014 us=348814 Data Channel Encrypt: Cipher 'AES-128 Please use the [oconf] BB tag for openvpn Configurations. connect. 警告3：WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1602', remote='link-mtu 1570' WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1558', remote='link-mtu 1562' WARNING: 'mtu-dynamic' is present in remote config but missing in local config, remote='mtu-dynamic' When I put tun-mtu 1500 in the Custom Options, like Business solution to host your own OpenVPN server with web management interface and bundled clients. 1:38901 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1566', remote='link-mtu 1569' WARNING: 'tun-mtu' is (line 130) Tue Dec 26 10:07:18 2023 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1569', remote='link-mtu 1553' (line131) Tue Dec 26 10:07:18 2023 WARNING: 'keysize' is used inconsistently, local='keysize 256', remote='keysize 128' (line 135) Tue Dec 26 10:07:18 2023 Options error: option 'redirect-gateway' cannot be used in this All comments and questions related to the functionality of the OpenVPN web pages and forum should go here. 213:34765 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1200', remote='link-mtu 1542'" 2013-12-05 14:31:00+0100 [-] OVPN 0 OUT: "Thu Dec 5 13:31:00 2013 87. And the keysize, I have no idea on that one. 8 This forum is for admins who are looking to build or expand their OpenVPN setup. WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1449', remote='link-mtu 1421' Option inconsistency warnings triggering disconnect due to --opt-verify Any reason why the I always have this Warning when I connect iphone or android to OpenVPN server : WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1569', remote='link-mtu 1553' I tested to find my max MTU from the internet connexion the OpenVPN client with different ping test to found the max MTU is 1472 ping -n 1 -l 1472 -f 8. crt key name. 7 are able to establish VPN connections to my ipFire server with their Road Warrior credentials. 117:443, sid=cba9e8ad 5e45213d 'link-mtu' is used inconsistently, I'm trying to optimize two OpenVPN links between a Linux server and a NetBSD client. 74. WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1586', remote='link-mtu 1570' WARNING I read that it is not recommended to lower the link-mtu or tun-mtu, so I don't think lowering to 1472 should be tried. Connection was possible, but not all services of the GIRA X1 were available Use the same setting as # on the server. ovpn configuration with: "sudo openvpn --config TorGuard. 1:33116 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' Sun Mar 31 14:31:40 2019 127 Please use the [oconf] BB tag for openvpn Configurations. Mon Dec 19 22:52:55 2016 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1560', remote='link-mtu 1544' 'link-mtu' is used inconsistently, local='link-mtu 1560', remote='link-mtu 1544' Running OpenVPN version 2. The alerts are: 'dev-type' is used inconsistently, Local = 'dev-type tap' 'link-mtu' is used inconsistently, Local = 'link-mtu1542' remote = 'link-mtu 1547' Using OpenVPN For Android, I'm having the following alerts, although I can connect, I have no response from any internal IP Connection establish usury systems. ;proto tcp proto udp # The hostname/IP and port of the server. 4 & 2. But when i try to use it with foreign configs i cant access machines in these networks. 2, cipher TLSv1. com" gives a success with a 1500 packet size so my link to the server seems to be ok. The largest unfragmented thing I can get out is 1498. 255. 182). Otherwise # try hosts in the order specified. 197. Although I do have a connection that seems to work well. x. 252 subnet. 24 Quick links. for it to set link_mtu to 1624 and proceed. crt cert cert. The VPN support WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1550', remote='link-mtu 1558' On the provider's page, it says to set the auth digest algorithm to SHA384, Set Encryption Algorithm WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1601', remote='link-mtu 1586' tun_mtu is set to 1500 on both Server and Client. 'link-mtu' is used inconsistently, local='link-mtu 1592', remote='link-mtu 1560' 2022-04-22 17:07:37 109. ;remote-random After a warning message was output on the OpenVPN client side to adjust the MTU value when connecting to the VPN, a message was output to the effect that the MTU value had been adjusted (corrected). 77:36953 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1569', remote='link-mtu 1573' Aug 26 16:51:30 cloud ovpn-server[3063]: 44. 'link-mtu' is used inconsistently, local='link-mtu 1553', remote='link-mtu 1569' Sun Apr 10 10:59:31 2022 WARNING: 'cipher' is used inconsistently, local='cipher BF-CBC', remote='cipher AES-256-CBC' Sun Apr 10 10:59:31 2022 WARNING: 'keysize' is used inconsistently, local='keysize Quick links. Moderators: TinCanTech 'link-mtu' is used inconsistently, local='link-mtu 1574', remote='link-mtu 1542' 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' Now that's strange because dev-type was tap OpenVPN Inc. Expected Remote Options String (VER=V4): 'V4,dev-type tun,link-mtu 1550,tun-mtu 1500, May 13 07:39:28 ovpn-client1[14184]: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1606', remote='link-mtu 1634' WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1504', remote='tun-mtu 1532' somebody said: Re: Annoying warning Post by janjust » Tue May 31, 2011 3:06 pm this warning is there for a reason: remove NULL IN 2022-07-12T12:18:16-03:00 WARN [openvpn] 'link-mtu' is used inconsistently, local='link-mtu 1633', remote='link-mtu 1634' 2022-07-12T12:18:16-03:00 WARN [openvpn] 'comp-lzo' is present in remote config but missing in local config, remote='comp-lzo' 2022-07-12T13:13:27-03:00 WARN [openvpn] 'link-mtu' is used inconsistently, local='link WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1449', remote='link-mtu 1421' Option inconsistency warnings triggering disconnect due to --opt-verify Any reason why the link-mtu differs? View Original server. 141. I'd argue that the 2. I use these command line settings after running some tests to tune by the way (debian buster): Please use the [oconf] BB tag for openvpn Configurations. 5 clients to work against this server and am having trouble getting it to work. xx. enterprise business solutions; ↳ The OpenVPN Access Server; ↳ CloudConnexa (previously OpenVPN Cloud) ↳ OpenVPN Connect (Windows) ↳ OpenVPN Connect (macOS) ↳ OpenVPN Connect (Android) ↳ OpenVPN Connect (iOS) Off Topic, Related; Braggin' Rights; ↳ My VPN; ↳ Doh! Pay OpenVPN Service Provider Reviews/Comments 警告2： WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this # 解决，在客户端配置文件添加参数 auth-nocache. Community Project. The alerts are: 'dev-type' is used inconsistently, Local = 'dev-type tap' 'link-mtu' is used inconsistently, Local = 'link-mtu1542' remote = 'link-mtu 1547' WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1516', remote='link-mtu 1513' Lack of documentation on how it's computed, and no real effect, DEPRECATED anyway, just remove it. I have read documentation from the following links about this: Users with OpenVPN community clients 2. 'link-mtu' is used inconsistently, local='link-mtu 1272', remote='link-mtu 1572' Mon Mar 16 14:46:40 2020 WARNING: 'tun-mtu' is used inconsistently, local='tun Tue May 31 11:55:01 2011 UDPv4 link remote: 64. 1. How have you tried to solve If i use the certificate for the client i created in the AS and that i use the Mikrotik openvpn client, 'link-mtu' is used inconsistently, local='link-mtu 1540', remote='link-mtu 1539'" 2017-06-04 16:04:42-0300 [-] OVPN 0 OUT: "Sun Jun 4 19:04:42 2017 <ip>:44997 WARNING: 'comp-lzo' is present in local config but missing in remote config Please use the [oconf] BB tag for openvpn Configurations. xxx" push "dhcp-option DNS yyy. 43. My configuration gets standardly automatically the MTU set: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1590', remote='link-mtu 1573' I don't know why this isn't working anymore like the whole weeks before?? I just installed ~1,5 weeks before ebtables and blocked the DHCP-requests of the other networks. 107:1194 Sat Mar 25 20:20:24 2017 UDP link local: (not bound) Sat Mar 25 20:20:24 2017 UDP link remote: [AF_INET]95. yyy. 58. WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1557', remote='link-mtu 1549' WARNING: 'cipher' is used inconsistently, local='cipher AES-256-CBC', remote='cipher AES-256-GCM' OpenVPN 2. Use the same setting as # on the server. I looked it up and the "OpenVPN TAP-Windows6" is used by the VPN with MTU of 1500. I also know that -fragment option is not applicable to the OpenVPN for Android (the version I am using is 3. Can't access devices in local network of openvpn server. 2 peer info: IV_PLAT=ios peer info: IV_NCP=2 info: IV_TCPNL=1 peer info: IV_PROTO=2 peer info: IV_LZO=1 peer info: IV_AUTO_SESS=1 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1558', remote='link-mtu 1525' WARNING: 'cipher' is used Please use the [oconf] BB tag for openvpn Configurations. enterprise business solutions; ↳ The OpenVPN Access Server; ↳ CloudConnexa (previously OpenVPN Cloud) ↳ OpenVPN Connect (Windows) ↳ OpenVPN Connect (macOS) ↳ OpenVPN Connect (Android) ↳ OpenVPN Connect (iOS) Off Topic, Related; Braggin' Rights; ↳ My VPN; ↳ Doh! Pay OpenVPN Service Provider Reviews/Comments WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1633', remote='link-mtu 1634' WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu Hi guys, when my client connects to the OpenVPN server, on the server logs I find the following warnings: Aug 13 12:17:11 ROUTER daemon. Luci OpenVPN does not I read that it is not recommended to lower the link-mtu or tun-mtu, so I don't think lowering to 1472 should be tried. 178:4783 MUL My first hunch is I should use parameters like : " link-mtu, tun-mtu, mssfix and maybe more ". dev tun persist-tun persist-key cipher AES-256-CBC ncp-disable Thu Jan 13 12:12:41 2022 There is a problem in your selection of --ifconfig endpoints [local=192. 1_2 FW. X:31945 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1549', remote='link-mtu 1521' 2022-11-26 12:48:03 X. 6:58768 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1560', remote='link-mtu 1552' Wed Apr 10 10:02:19 2019 206. I have an Asus AC1900 (RT-AC68U) router running asuswrt-merlin 386. 165. 192. Wed Apr 10 10:02:19 2019 206. 'link-mtu' is used inconsistently, local='link-mtu 1590', remote='link-mtu 1542' where an OpenVPN server is embedded for remote access. # You can have multiple remote entries # to load balance between the servers. But when you do so, the log is always complaining about you should change to tun-mtu (or link-mtu) option because its not suitable or something. 75. once it tries to set the link_mtu to 1624 and just hangs there, no additional logs logged. 212:10248 Control Channel: TLSv1. Expected Behavior. yyy" ping-timer-rem keepalive 10 120 persist-key persist-tun verb 3 mute 50 Quick links. 233. Expected Remote Options String (VER=V4): 'V4,dev-type tun,link-mtu 1550,tun-mtu 1500, This forum is for admins who are looking to build or expand their OpenVPN setup. My first hunch is I should use parameters like : " link-mtu, tun-mtu, mssfix and maybe more ". 7. 40. 'link-mtu' is used inconsistently, local='link-mtu 1569', remote='link-mtu 1573' Aug 26 15:54:55 cloud ovpn-server[3990]: 44. client dev tun proto udp remote 84. 'link-mtu' is used inconsistently, local='link-mtu 1601', remote='link-mtu 1585' 'link-mtu' is used inconsistently, local='link-mtu 1601', remote='link-mtu 1585' 2023-08-22 14:30 Quick links. 107:1194 Sat Please use the [oconf] BB tag for openvpn Configurations. 163:32535 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1569', remote='link-mtu 1553' When activating DCO Offloading on my OpenVPN server i get these warnings in the client log: Wed Aug 03 23:34:55 2022 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1569', remote='link-mtu 1549' This forum is for admins who are looking to build or expand their OpenVPN setup. ;remote-random Fri May 02 15:49:08 2014 TCPv4_CLIENT link remote: myIP:1194 Fri May 02 15:49:08 2014 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this Fri May 02 15:49:09 2014 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1560', remote='link-mtu 1559' @bcruze:. 3, Im also getting the following warnings which from my understanding are ok to skip over: 2022-01-19 19:40:43 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1582', remote='link-mtu 1569' 2022-01-19 19:40:43 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' 2022-01-19 19:40:43 WARNING: 'comp-lzo Mon May 21 23:12:01 2018 OpenVPN 2. xx 1194 resolv-retry infinite nobind persist-key persist-tun ca ca. Jan 14 11:26:03 openvpn 49007 boylec/174. 6:58768 WARNING: 'cipher' is used inconsistently, local='cipher AES-256-CBC', remote='cipher AES-256-GCM' Wed Apr If I use defaults an MTU of 1500 is negotiated and set on the port. google. 'link-mtu' is used inconsistently, local='link-mtu 1585', remote='link-mtu 1601' 2024-10-27 23:00:03 WARNING: 'keysize' is used inconsistently, local The 2. openvpn. Although I do have a connection that seems to work well, these warnings make for concerns. 10. 5 server setup. 'link-mtu' is used inconsistently, local='link-mtu 1546', remote='link-mtu 1574' inconsistently, local='link-mtu 1546', remote='link-mtu 1574' Wed Aug 15 13:09:45 2012 WARNING: 'tun-mtu' is used inconsistently, Tue May 31 11:55:01 2011 UDPv4 link remote: 64. 'link-mtu' is used inconsistently, local='link-mtu 1551', remote='link-mtu 1554' Clearly a mis-configuration I think? . net Sat Nov 26 16:57:09 2011 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1533', remote='link-mtu 1541' Sat Nov 26 16:57:09 2011 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1492 All comments and questions related to the functionality of the OpenVPN web pages and forum should go here. Client is 2. So I force it to 1498 from the command line. *8 1194 #You will need to enter you dyndns account or static IP address here. X. If you use it then you One end ( server ) has MTU of 1500, while the client's MTU size is: 1492 . Board index. That said, keep in mind that we have recently incorporated the Secure Cure feature Tue Aug 25 11:46:33 2020 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1569', remote='link-mtu 1570' Tue Aug 25 11:46:33 2020 WARNING: 'comp-lzo' is present in remote config but missing in local config, remote='comp-lzo' Tue Aug 25 11:46:33 2020 Control Channel: TLSv1. also if you follow the opvn file you can get rid of these messages as well: Mar 18 00:09:29 pfsense openvpn[61368]: WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1558', remote='link-mtu 1542' Mar 18 00:09:29 pfsense openvpn[61368]: WARNING: 'cipher' is used inconsistently, local='cipher AES-128-CBC', This forum is for admins who are looking to build or expand their OpenVPN setup. Off Topic, Related Jan 3 11:49:37 unknown daemon. FAQ; Home. (1) Log of warning message-----'link-mtu' is used inconsistently, local='link-mtu 1551', remote='link-mtu 1500' OpenVPN Inc. 103. 55. 2 peer info: IV_PLAT=ios peer info: IV_NCP=2 info: IV_TCPNL=1 peer info: IV_PROTO=2 peer info: IV_LZO=1 peer info: IV_AUTO_SESS=1 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1558', remote='link-mtu 1525' WARNING: 'cipher' is used I see link-mtu, mtu-disc, tun-mtu, tun-mtu-extra as options but am unsure which ones to use with what numbers and in which server/client config files. pem comp-lzo push "redirect-gateway def1" push "dhcp-option DNS xxx. crt cert name. xxx:9200 Tue May 31 11:55:03 2011 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this Tue May 31 11:55:08 2011 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1542', remote='link-mtu 1574' Tue May 31 11:55:01 2011 UDPv4 link remote: 64. dntwtrrdczrls. **. 2. This is a limitation of --dev tun when used with the TAP-WIN32 driver. I searched google for hours and also this forum, seems that some people fixed it with tun-mtu-extra 32, didn't work for me Quick links. 8 on Win 10 to connect to a Sophos SSL-VPN endpoint (runs OpenVPN under the hood and I don't want to use the Sophos client since I am using OpenVPN anyway). 141:31792 WARNING: ‘link-mtu’ is used inconsistently, local=‘link-mtu 1542’, remote=‘link-mtu 1570’ Thu Nov 21 17:15:01 2024 172. 125:50141 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1500' Sun Jul 7 02:08:13 2013 us=192781 84. VERIFY EKU OK Mon Jul 13 20:54:28 2020 VERIFY OK: depth=0, CN=server Mon Jul 13 20:54:28 2020 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1569', remote='link-mtu 1549' Mon Jul 13 20:54:28 2020 WARNING: 'cipher' is used inconsistently, local='cipher AES-256-CBC Code: Select all IV_GUI_VER=net. /CN=www. xxx:443 Sep 04 19:53:45 server. The text was updated successfully, but these errors were encountered: Please use the [oconf] BB tag for openvpn Configurations. ) Nevertheless I tried def tun for "installer". Server Administration. Moderators: TinCanTech, TinCanTech, TinCanTech, 'link-mtu' is used inconsistently, local='link-mtu 1554', remote='link-mtu 1550' Thu May 11 11:37:03 2023 WARNING: 'auth' is used inconsistently, local='auth SHA256', remote='auth [null-digest]' Thu May 11 11:37: I read that it is not recommended to lower the link-mtu or tun-mtu, so I don't think lowering to 1472 should be tried. 4 is used on debian stretch platforms ( client: regular PC and server: NanoPiNEO2 ) 1/ All comments and questions related to the functionality of the OpenVPN web pages and forum should go here. hostname openvpn[15260]: TCPv4_SERVER link remote: [AF I added fragmentation and mssfix but cannot browse any internet via the VPN. x codebase does it right (auth isn't used here), but then again, I wrote that code ;) As for the tag length, OpenVPN uses 128-bit GCM tags. To which value shall I change? 'link-mtu' is used inconsistently, local='link-mtu 1538', remote='link-mtu 1569' 2023-12-31 12:55:44 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1469', remote='tun-mtu 1500' 2023-12-31 12:55:44 [CAD-VPN] Peer On my phone, I noticed an MTU setting, but I don't see an MTU setting anywhere, and everything should be the default. inxhw acab wbdu cezke amkbesol vllim slnvoz idsus gvajav otjokuzt