Very slow network speed using Tinc

[Florent Bautista]

On 10/23/2013 03:53 PM, Florent Bautista wrote:
> On 10/23/2013 01:06 PM, Guus Sliepen wrote:
>> That's correct, those files are generated by running:
>>
>> autoreconf -fsi
>>
>> Afterwards, just run ./configure and make as usual. See also the README.git file.
>>
>>
> Thank you, it's OK.
>
> 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 15:46:15 host2 tinc.tincnetwork[8999]: Got MTU probe request 1518
> from host1 (192.168.0.71 port 655)
> Oct 23 15:46:15 host2 tinc.tincnetwork[8999]: Got MTU probe request 1518
> from host1 (192.168.0.71 port 655)
> Oct 23 15:46:15 host2 tinc.tincnetwork[8999]: Got MTU probe request 1518
> from host1 (192.168.0.71 port 655)
> 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]: Sending MTU probe length
> 1518 to host1 (192.168.0.71 port 655)
> 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)
> Oct 23 15:46:16 host2 tinc.tincnetwork[8999]: Got type 2 MTU probe reply
> 1518 from 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)
> Oct 23 15:46:16 host2 tinc.tincnetwork[8999]: host1 (192.168.0.71 port
> 655) RTT 0.18 ms, burst bandwidth 476.235 Mbit/s, rx packet loss 100.00 %
>
>
> Interfaces are all MTU 1500...
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Now I see errors when I ping -s 1470...


Oct 23 17:18:42 host2 tinc.tincnetwork[3724]: Error while decrypting:
error:00000000:lib(0):func(0):reason(0)
Oct 23 17:18:42 host2 tinc.tincnetwork[3724]: Failed to decrypt and
verify packet