I'm running openvpn on a Digital Ocean VPN running Centos 7.
Empirical MTU test completed [Tried,Actual] local->remote=[1525,1525]
remote->local=[1522,1522]
From the log file:
Thu May 17 03:32:20 2018 us=740472 tun_mtu = 1500
Thu May 17 03:32:20 2018 us=740480 tun_mtu_defined = ENABLED
Thu May 17 03:32:20 2018 us=740488 link_mtu = 1500
Thu May 17 03:32:20 2018 us=740496 link_mtu_defined = DISABLED
Thu May 17 03:32:20 2018 us=740503 tun_mtu_extra = 0
Thu May 17 03:32:20 2018 us=740511 tun_mtu_extra_defined = DISABLED
Thu May 17 03:32:20 2018 us=740518 mtu_discover_type = -1
Thu May 17 03:32:20 2018 us=740526 fragment = 0
Thu May 17 03:32:20 2018 us=740534 mssfix = 1450
There doesn't seem to be a definitive guide regarding how to use the MTU test output. Can this setup be further tuned?
System info:
Server:
Linux ctvpn 3.10.0-693.21.1.el7.x86_64 #1 SMP Wed Mar 7 19:03:37 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
OpenVPN 2.4.5 x86_64-redhat-linux-gnu [Fedora EPEL patched] [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Mar 1 2018
Client:
Openvpn for Android 0.7.5 running on Android 8.1
