Russell Morris wrote:
Hi,
I have been measuring data throughput and RTT on my OpenVPN link (client to
server), and while data throughput has been quite consistent (in the 25-30 Mb/s
range), RTT (ping) has shown a strange artifact.
If I run ping continuously (1 second interval), I may see 10 or 20 very
consisten runs, at ~ 10 ms ... but then a single point at 200-250 ms. If I let
it keep running this keeps happening - not with a consistent pattern, but about
this rate.
Has anyone else seen a similar artifact?
ping RTT times over a VPN link can vary quite a bit, as I've noticed,
esp after a lack of activity for some time. If the spikes happen every
10 to 20 seconds , however, then I suspect the openvpn pings are getting
in the way - try changing the 'ping' (or 'keepalive') options to
ping 20
or
keepalive 20 120
if the spikes now occur very 20 to 40 seconds then you've found the culprit.
HTH,
JJK
