Higher packet loss after upgrade to Debian 11

[eKrajnak]

Hello,

I recently upgraded server from Debian 10 to 11, Zabbix 4.0.39 from zabbix.com repos.

After upgrade I see higher packet loss on graphs (measured by simple check / fping). I reviewed changelogs and I found that Debian 10 uses fping 4.2 and Debian 11 uses fping 5.0.

Fping 5.0 introduces an incompatible change:

In non-quiet loop and count mode, a line is printed for every lost packet (#175, thanks @kbucheli):

$ fping -D -c2 8.8.8.8 8.8.8.7
[1596092373.18423] 8.8.8.8 : [0], 64 bytes, 12.8 ms (12.8 avg, 0% loss)
[1596092374.18223] 8.8.8.7 : [0], timed out (NaN avg, 100% loss)
[1596092374.18424] 8.8.8.8 : [1], 64 bytes, 12.3 ms (12.5 avg, 0% loss)
[1596092375.18344] 8.8.8.7 : [1], timed out (NaN avg, 100% loss)

8.8.8.8 : xmt/rcv/%loss = 2/2/0%, min/avg/max = 12.3/12.5/12.8
8.8.8.7 : xmt/rcv/%loss = 2/0/100%

Are we sure that Zabbix 4.0.X correctly handle this behaviour of fping 5?


Thanks,
Blažej

[tim.mooney]

I have a vague recollection that there was a patch to support fping 3.1 in some version of Zabbix, but I don't recall seeing any changes related to fping 4 or fping 5.

You may want to do some searching in on the bug-report site, to see if the issue is mentioned there.