[corosync] information request

Vladislav Bogdanov bubble at hoster-ok.com
Fri Nov 29 05:22:14 UTC 2013

26.11.2013 23:22, Slava Bendersky wrote:
> Hello Honza,
> Thank you for exact instruction how to find the trouble.
> I followed step by step. Corosync-objectctl is not reporting errors I
> was be able see data which you described earlier.
> And I see interfaces both ends are bounded to proper ip address. Also I
> see on tcpdump valid traffic which quite chatty.
> > [bad udp cksum 6a0!] UDP, length 107
> 14:52:09.333729 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto
> UDP (17), length 135)

This ^^^ could be a source of the issue.
Bad UDP checksumm usually means you have broken ethernet hardware or IP
stack (and main reason for this could be a broken DIMM) somewhere on the

Such packets are dropped by a kernel, so corosync wont see them.

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