Re: High-latency link & tunnels: strange problem

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Herbert Xu <herbert@gondor.apana.org.au> wrote:

> > 09:39:25.563302 80.x.x.177.41280 > 62.x.x.217.http: . ack 5841 win 0
> > 09:39:25.776159 62.x.x.217.http > 80.x.x.177.41280: . ack 109 win 5840
(DF)
> > 09:39:25.793513 80.x.x.177.41280 > 62.x.x.217.http: . ack 5841 win 0
> > .....................
>
> That's clearly a NOC spoofing proxy which improves performance over
> satellite, especially in the presence of non-congestive packet loss.

BTW, does anybody know if such a proxy is available in open-source?
I've been searching google for a while, nothing found, that seems quite
unreal.

> > And this is the tunnel one:
> > [root@ve0 root]# tcpdump -i tun0 -n port http
> > tcpdump: listening on tun0

> This is too short.  Please send me the complete dump privately or
> put it up on the web.

You can see full logs here:

Direct transfer: http://www.vtx.ru/no_tunnel.txt
OpenVPN transfer: http://www.vtx.ru/tunnel.txt

> > My end runs at linux 2.4.27. Server end runs the same system currently,
but
> > I've tried another server wich I have access to, it runs linux 2.4.20 or
so.
>
> OK, I suspect packet loss might be playing a role here.  The complete
> dump should tell us what the problem is.

Ok, thanks a lot!

-- vlad


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