[mrtg] How to measure latency and packet loss?

Rune Mossige Rune.Mossige at waii.com
Wed Feb 2 14:36:10 MET 2000

We have a VPN link from two sites, across the Internet (usually 18-20 hops
away), and I would like MRTG to measure the latency on this line.

Also, several of our users complain, from time to time, that an ordinary
'ping remote-host', have lots of packet loss, as the example show:

64 bytes from XXX.YYY.ZZZ.51: icmp_seq=23 ttl=252 time=389 ms
64 bytes from XXX.YYY.ZZZ.51: icmp_seq=24 ttl=252 time=429 ms
64 bytes from XXX.YYY.ZZZ.51: icmp_seq=25 ttl=252 time=393 ms
--- XXX.YYY.ZZZ.com ping statistics ---
28 packets transmitted, 18 packets received, 35% packet loss
round-trip min/avg/max = 388/399/429 ms

35% packet loss seems a bit steep......How do I measure this?

The VPN-link is 512Kbits/s, and MRTG is monitoring it, showing traffic. On
the 'Yearly' graph, I get these numbers:

Max  In:           Average  In:     Current  In:
230.6 kb/s (2.3%)  92.7 kb/s (0.9%) 60.4 kb/s (0.6%) 

Max  Out:          Average  Out:    Current  Out:
35.9 kb/s (0.4%)   12.4 kb/s (0.1%) 22.5 kb/s (0.2%)

To me, this does not look like the VPN link is overloaded. I am not quite
sure where to start looking, so any help would be appreciatecd.

What is the recommended way to get MRTG to measure latency?
What is the recommended way to get MRTG to measure packet loss?

(-: Hiroshima 45, Chernobyl 86, Windows 95 :-)
Our ultimate goal is to make overloaded machines appear to be idle.
High performance, High reliability, Low cost -------- Pick any two.
Rune Mossige, Systems Support, Western Geophysical, Stavanger, Norway
Tel: (+47)51598922    Fax:(+47)51598999    Mobile:(+47)90871024

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