Hi All For the last few weeks my Wireguard link which I use to as my default gateway has been having issues with TCP connections stalling.
I've been trying to work out what is wrong. I just noticed that the Wireguard link has dropped packets at both ends. wg-p2p Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:104.127.123.10 P-t-P:103.127.123.10 Mask:255.255.255.248 inet6 addr: 2506:c500:ff4:1::ab/64 Scope:Global inet6 addr: fe80::e6/64 Scope:Link UP POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 RX packets:141849 errors:0 dropped:5915 overruns:0 frame:0 TX packets:141626 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:33771496 (33.7 MB) TX bytes:14348632 (14.3 MB) wg-p2p Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:104.127.123.9 P-t-P:103.127.123.9 Mask:255.255.255.248 inet6 addr: 2506:c500:ff4:1::aa/64 Scope:Global inet6 addr: fe80::dc/64 Scope:Link UP POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 RX packets:663287 errors:1 dropped:1433 overruns:0 frame:1 TX packets:1023948 errors:594 dropped:13 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:110192140 (110.1 MB) TX bytes:872273836 (872.2 MB) Note the above is after a reboot of both end points (about 4 mins) One end is running a 4.4.0 kernel ii wireguard 1.0.20200510-1~16.04 all fast, modern, secure kernel VPN tunnel (metapackage) ii wireguard-dkms 1.0.20200429-2~16.04 all fast, modern, secure kernel VPN tunnel (DKMS version) ii wireguard-tools 1.0.20200510-1~16.04 i386 fast, modern, secure kernel VPN tunnel (userland utilities) The other is ii wireguard 1.0.20200319-1ubuntu1~14.04 all fast, modern, secure kernel VPN tunnel (metapackage) ii wireguard-dkms 1.0.20200429-1~14.04 all fast, modern, secure kernel VPN tunnel (DKMS version) ii wireguard-tools 1.0.20200319-1ubuntu1~14.04 amd64 fast, modern, secure kernel VPN tunnel (userland utilities) I was thinking of rebuilding the ubuntu 14.04 to a 16.04 (18.04 uses netplan and can be a real pain to setup) I've done my best to check the underlying Internet and I do not think packets are be dropped in general or between the two end points. How do I tell why the packets have been dropped ? What do I need to look at to try to fix this ? Thanks Mike