[corosync] information request

Slava Bendersky volga629 at networklab.ca
Fri Nov 29 05:36:45 UTC 2013

Yes, this possible since everything running on vmware. Another point that might mtu problem involved, because vm located in two different geo locations. We tried many think so far, include lower netmtu to 1000, but it is not really helped. Corosync still unstable and right now it is only vmware left on the way. 


----- Original Message -----

From: "Vladislav Bogdanov" <bubble at hoster-ok.com> 
To: discuss at corosync.org 
Sent: Friday, November 29, 2013 12:22:14 AM 
Subject: Re: [corosync] information request 

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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