On Wed, Oct 23, 2013 at 05:21:01PM +0200, Florent Bautista wrote: > > But... with Tinc 1.1 (git), I have a big MTU problem... > > > > Tinc does not seem to handle packets of 1500 bytes... > > > > ping -s 1400 is OK > > ping -s 1500 is not OK. > > > > with 1.0.23, both were OK. > > > > 1469 bytes packet is OK, 1470 is not. > > > > Same parameters (defaults, except addresses of hosts). > > > > In logs, it does not seem to get errors but I can see that : > > > > Oct 23 15:46:16 host2 tinc.tincnetwork[8999]: Sending MTU probe length > > 1518 to host1 (192.168.0.71 port 655) > > Oct 23 15:46:16 host2 tinc.tincnetwork[8999]: Got type 2 MTU probe reply > > 1518 from host1 (192.168.0.71 port 655)
Do you have jumbograms enabled on your physical network, or are the two VMs
running on the same machine connected by a virtual network?
That aside, tinc should handle that case, so that is definitely a bug. I'll try
to find out what is happening.
> > Interfaces are all MTU 1500...
Hm, but somehow tinc things that it can send packets with a payload up to 1518
bytes between the two hosts, and that is excluding the tunneling and encryption
overhead. On a real network with MTU set to 1500 tinc normally responds that
the PMTU is 1451 bytes.
--
Met vriendelijke groet / with kind regards,
Guus Sliepen <[email protected]>
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