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StanTastic
Asked: 2016-12-23 02:24:31 +0800 CST

Measure RTT for SSH

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I'm trying to figure out a way to measure RTT for SSH connection, but my google-fu is too weak (perhaps I'm asking wrong questions?).

Something akin to ping , for cases where SSH works, but ICMP does not.

ssh ping

1 Answers

  1. HPing is a tool that performs the equivalent of ping but does so over TCP, so works around networks where ICMP is blocked.

    http://backdrift.org/tcp-ping-ping-tcp-port and http://www.hping.org/ describe it in more detail.

    From the former:

    $ hping -S -p 80 google.com
HPING google.com (eth0 66.249.92.104): S set, 40 headers + 0 data bytes
len=44 ip=66.249.92.104 ttl=47 id=10442 sport=80 flags=SA seq=0 win=5720 rtt=97.7 ms
len=44 ip=66.249.92.104 ttl=47 id=40838 sport=80 flags=SA seq=1 win=5720 rtt=97.7 ms
len=44 ip=66.249.92.104 ttl=47 id=64607 sport=80 flags=SA seq=2 win=5720 rtt=97.7 ms
len=44 ip=66.249.92.104 ttl=47 id=10443 sport=80 flags=SA seq=3 win=5720 rtt=97.7 ms

    In your case you'd use -p 22 to target SSH.

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