netdev - Re: After many hours all outbound connections get stuck in SYN

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Date:	Thu, 20 Dec 2007 11:08:45 -0500
From:	"James Nichols" <jamesnichols3@...il.com>
To:	"Eric Dumazet" <dada1@...mosbay.com>
Cc:	"Jan Engelhardt" <jengelh@...putergmbh.de>,
	linux-kernel@...r.kernel.org,
	"Linux Netdev List" <netdev@...r.kernel.org>
Subject: Re: After many hours all outbound connections get stuck in SYN_SENT

> I still dont understand.
>
> "tcpdump -p -n -s 1600 -c 10000" doesnt reveal User data at all.
>
> Without any exact data from you, I am afraid nobody can help.

Oh, I didn't see that you specified specific options.  I'll still have
to anonymize 2000+ IP addresses, but I think there is an open source
tool that will do this for you.



> >> 2) Are you sure you are not using connection tracking, and hit a limit on it ?
> >
> > I'm using ip_conntrack, but the limit I have for max entries is 65K.
> > The most I've seen in there are a couple thousand- that was one of the
> > first things I monitored very closely.
>
> Now please try without conn tracking module. I saw many failures in the past
> that were trigered by conntrack.
>
> Do you have some firewall rules, using some netfilter modules like hashlimit ?

I will have to look into this.
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