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On Dec 17, 2007, at 22:35 , Christos Zoulas wrote:

> In article <47671AF1.3010201@flame.org>, M Graff   
> <explorer@flame.org> wrote:
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>> This has started happening both in a -current to -current setup, and
>> between a 4.0 BETA 2 box to whatever cvs.netbsd.org is running.
>>
>> There seems to be no common reason for this; I've had it happen when
>> ssh'ing locally to a box on the same wire as me, and when ssh'ing  
>> over a
>> IP tunnel which is probably making packets fragment.
>>
>> netsat -s reports no packets with bad checksums in any protocol, and
>> nothing else that jumps out at me as a potential cause.
>>
>> Until today, every time this occurred it was between a machines I  
>> own on
>> both sides.  Today, it happened with the sshd that comes from the
>> 4.0_BETA2 install I made (and did not compile myself) and  
>> cvs.netbsd.org.
>>
>
> I've seen that with IPSEC tunnels...  Are you running over an IPSEC  
> tunnel?


I see this with gre(4) tunnels, IPSEC transport over gre(4) tunnels to  
be precise. Switching the VPN configuration to use IPSEC tunnels  
without gre(4) interfaces works fine.

-- 
    aew


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