Re: [B.A.T.M.A.N.] two-way-tunnel quirks

[Axel Neumann <axel@open-mesh.net>]

Hi,

perhaps this has something to do with the reduced maximum-transfer-unit (mtu) 
which ist left for the tunnel interfaces. Since the one-way-tunnel do only 
tunnel the upling-traffic but NOT tunnel the downlink traffic this is not a 
problem when trying to connect to a intractable www server.

Did I understand you correct, that these problems only occurs when surfing to 
a few webservers, but not to all webservers?

Can you try what happens if you reduce the mtu of the outgoing interface at 
the upstream gateway (e.g. ifconfig ethX mtu 1400). I think there might be 3 
possible results:
 1) everything remains as before, there is another reason
 2) the hotmai/msn/live.com or pop services are not reachable anymore from the 
upstream gw. Then we have at least a hint. 
 3) Now these services also work inside the mesh. Maybe the icmp messages 
which are supposed to communicate the path-mtu-problem were not correctly 
transmitted from the tunnel interface but succeed from the upstream gw 
interface to the server. 

ciao,
axel


On Samstag 01 Dezember 2007, Marek Lindner wrote:
> > now i found an issue which i didn't relate with batman
> > first. I got several reports of users, hotmail/msn/live.com
> > not being accessible anymore...
> > Yesterday i found out theres also problems with some pop server
> > not beeing accessible, but everything works fine directly at the
> > upstream gw, without any batmand involved.
>
> Unfortunately, it is too few information to do anything about it. Could you
> describe your experiences in more detail. Here some questions on the way:
>
> - When did you notice the problem for the first time ?
> - Which revision was used ?
> - What exactely is your problem ?
> - Can you describe it in way that i can reproduce it ?
>
> Greetings,
> Marek
>
>
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