Thanks for sharing, I have also been running WG tunnels over T-Mobile home internet and haven’t seen any of the jitter you are reporting.
Did you try the same tests (outbound) without running them via WG? Which modem do you have? How many signal bars are you getting? Also, what does an non-tunneled speed test report? Cheers > On Apr 10, 2021, at 10:31, Lonnie Abelbeck <[email protected]> wrote: > > Greetings, > > I have been testing the T-Mobile Home Internet (4G/5G fixed wireless) service > to a Linode VM via WireGuard. > > The TMHI service uses CGNAT plus an additional NAT in their modem/gateway > with a MTU of 1420, so WireGuard is configured with a 1340 MTU. > > Everything works, but I thought I would share some jitter results that > readers here might find interesting. > > [gw-lan WGIP:10.4.1.1] -- [TMHI modem/gateway] -- 4G/5G/CGNAT -- [linode > WGIP:10.4.1.10] > > gw-lan ~ # mtr -wn -c 30 -s 1340 10.4.1.10 > ... > HOST: gw-lan Loss% Snt Last Avg Best Wrst StDev > 1.|-- 10.4.1.10 0.0% 30 88.7 88.9 77.2 99.2 5.4 > > Looks to be as expected, in the direction of the CGNAT, now the other > direction, against the grain of the CGNAT ... > > linode ~ # mtr -wn -c 30 -s 1340 10.4.1.1 > ... > HOST: linode Loss% Snt Last Avg Best Wrst StDev > 1.|-- 10.4.1.1 0.0% 30 206.1 243.5 73.8 393.9 97.9 > > Huge jitter, and is very reproducible. But no packet loss. > > Further investigation shows for low traffic rates (linode->gw-lan) the jitter > over WireGuard is huge, here are some UDP iperf3 tests showing how the jitter > goes down as the traffic rate is increased. > > linode ~ # iperf3 -c 10.4.1.1 -u -b 5k -t 30 > ... > [ ID] Interval Transfer Bitrate Jitter Lost/Total > Datagrams > [ 5] 0.00-30.25 sec 18.9 KBytes 5.11 Kbits/sec 68.428 ms 0/15 (0%) > receiver > > linode ~ # iperf3 -c 10.4.1.1 -u -b 10k -t 30 > ... > [ ID] Interval Transfer Bitrate Jitter Lost/Total > Datagrams > [ 5] 0.00-30.30 sec 37.7 KBytes 10.2 Kbits/sec 82.411 ms 0/30 (0%) > receiver > > linode ~ # iperf3 -c 10.4.1.1 -u -b 50k -t 30 > ... > [ ID] Interval Transfer Bitrate Jitter Lost/Total > Datagrams > [ 5] 0.00-30.14 sec 184 KBytes 49.9 Kbits/sec 7.532 ms 0/146 (0%) > receiver > > linode ~ # iperf3 -c 10.4.1.1 -u -b 100k -t 30 > ... > [ ID] Interval Transfer Bitrate Jitter Lost/Total > Datagrams > [ 5] 0.00-30.10 sec 367 KBytes 100 Kbits/sec 4.182 ms 0/292 (0%) > receiver > > linode ~ # iperf3 -c 10.4.1.1 -u -b 500k -t 30 > ... > [ ID] Interval Transfer Bitrate Jitter Lost/Total > Datagrams > [ 5] 0.00-30.11 sec 1.79 MBytes 498 Kbits/sec 1.308 ms 0/1456 (0%) > receiver > > > So using VoIP a higher bitrate CODEC is actually better w.r.t jitter. > > Hope others find this interesting. > > Lonnie >
