netdev - Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround

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Date:	Fri, 15 Aug 2008 18:59:40 -0300
From:	Dâniel Fraga <fragabr@...il.com>
To:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Cc:	David Miller <davem@...emloft.net>, thomas.jarosch@...ra2net.com,
	billfink@...dspring.com, Netdev <netdev@...r.kernel.org>,
	Patrick Hardy <kaber@...sh.net>, sr@...urenet.de,
	netfilter-devel@...r.kernel.org, kadlec@...ckhole.kfki.hu
Subject: Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility
 workaround

On Fri, 15 Aug 2008 10:06:39 +0300 (EEST)
"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> wrote:

> I would be better to have tcpdump running at least a bit back (2-3 windows 
> back is long enough for me), but obviously that might not be possible 
> option because it occurs so rarely. ...It should be possible to have 
> tcpdump restarted once in a while to avoid a one huge log if you'd just 
> keep running tcpdump from beginning.

	Ok.

> What do you mean by "come back alive"...? ...In eth0 log I found this 
> connection 189.38.18.122.995 > 192.168.0.2.35477, the ip matches with 
> abusar's. But I'm not sure if the connection in the tunnel is the 
> interesting one, since it's going to/from port 119 but the ip addresses 
> (10.195.195.2 and 10.195.195.1) don't tell anything to me, I guess you 
> know their meaning (ie., if 10.195.195.2 is the one with which the 
> connection stalls)? ...You're probably right that this wasn't very useful 
> log, the longest "stall" I find is only 1.111328 seconds long (and it 
> might be due to some processing that is made by 10.195.195.2).

	By "come back alive" I mean when the connection isn't stalled
anymore.

189.38.18.122 -> server

10.195.195.1 -> my local VPN ip (tun1)

10.195.195.2 -> remote VPN ip (on the server)

192.168.0.2 -> my local ip (eth0)

	Should I run tcpdump on the server too, or is it sufficient to
dump just on my client machine?

	Thank you very much again.

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