I'm connecting to an openvpn server using SSL over an LTE link from a client running openwrt on a netgear router. If you're still here after that description, I'm witnessing some strange behavior that I can't figure out. While pings from the client (router) over the LTE modem to the openvpn server are nice and consistent:

ping 172.16.2.14
PING 172.16.2.14 (172.16.2.14): 56 data bytes
64 bytes from 172.16.2.14: seq=0 ttl=64 time=93.543 ms
64 bytes from 172.16.2.14: seq=1 ttl=64 time=97.719 ms
64 bytes from 172.16.2.14: seq=2 ttl=64 time=84.322 ms
64 bytes from 172.16.2.14: seq=3 ttl=64 time=86.741 ms
64 bytes from 172.16.2.14: seq=4 ttl=64 time=84.384 ms
64 bytes from 172.16.2.14: seq=5 ttl=64 time=92.789 ms
64 bytes from 172.16.2.14: seq=6 ttl=64 time=92.552 ms
64 bytes from 172.16.2.14: seq=7 ttl=64 time=85.477 ms
64 bytes from 172.16.2.14: seq=8 ttl=64 time=84.115 ms
64 bytes from 172.16.2.14: seq=9 ttl=64 time=82.746 ms
64 bytes from 172.16.2.14: seq=10 ttl=64 time=82.404 ms
64 bytes from 172.16.2.14: seq=11 ttl=64 time=83.059 ms
64 bytes from 172.16.2.14: seq=12 ttl=64 time=82.839 ms
64 bytes from 172.16.2.14: seq=13 ttl=64 time=84.569 ms
64 bytes from 172.16.2.14: seq=14 ttl=64 time=82.126 ms
64 bytes from 172.16.2.14: seq=15 ttl=64 time=84.781 ms
64 bytes from 172.16.2.14: seq=16 ttl=64 time=81.558 ms
64 bytes from 172.16.2.14: seq=17 ttl=64 time=92.970 ms


Pings from the server to the client gradually decrease then spike in a repeating pattern:

PING 172.16.2.30 (172.16.2.30) 56(84) bytes of data.
64 bytes from 172.16.2.30: icmp_req=1 ttl=64 time=79.0 ms
64 bytes from 172.16.2.30: icmp_req=2 ttl=64 time=358 ms
64 bytes from 172.16.2.30: icmp_req=3 ttl=64 time=317 ms
64 bytes from 172.16.2.30: icmp_req=4 ttl=64 time=275 ms
64 bytes from 172.16.2.30: icmp_req=5 ttl=64 time=236 ms
64 bytes from 172.16.2.30: icmp_req=6 ttl=64 time=201 ms
64 bytes from 172.16.2.30: icmp_req=7 ttl=64 time=150 ms
64 bytes from 172.16.2.30: icmp_req=8 ttl=64 time=110 ms
64 bytes from 172.16.2.30: icmp_req=9 ttl=64 time=389 ms
64 bytes from 172.16.2.30: icmp_req=10 ttl=64 time=348 ms
64 bytes from 172.16.2.30: icmp_req=11 ttl=64 time=306 ms
64 bytes from 172.16.2.30: icmp_req=12 ttl=64 time=265 ms
64 bytes from 172.16.2.30: icmp_req=13 ttl=64 time=224 ms
64 bytes from 172.16.2.30: icmp_req=14 ttl=64 time=182 ms
64 bytes from 172.16.2.30: icmp_req=15 ttl=64 time=140 ms
64 bytes from 172.16.2.30: icmp_req=16 ttl=64 time=100 ms
64 bytes from 172.16.2.30: icmp_req=17 ttl=64 time=378 ms
64 bytes from 172.16.2.30: icmp_req=18 ttl=64 time=337 ms
64 bytes from 172.16.2.30: icmp_req=19 ttl=64 time=297 ms
64 bytes from 172.16.2.30: icmp_req=20 ttl=64 time=254 ms
64 bytes from 172.16.2.30: icmp_req=21 ttl=64 time=214 ms
64 bytes from 172.16.2.30: icmp_req=22 ttl=64 time=172 ms
64 bytes from 172.16.2.30: icmp_req=23 ttl=64 time=130 ms
64 bytes from 172.16.2.30: icmp_req=24 ttl=64 time=89.1 ms
64 bytes from 172.16.2.30: icmp_req=25 ttl=64 time=367 ms


I've enabled logging at level 7 on both client and server, but don't see anything interesting. This one-way graduating latency is quite consistent. I'm hoping someone will see this pattern and know what's causing it.

Thanks.

-Randall

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