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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: "Павел Коколемин" <pavelkok@gmail.com>
Cc: netfilter@lists.netfilter.org
Subject: Re: nfnl_listen: recvmsg overrun: No buffer space available" in	nfct_event_conntrack() call
Date: Thu, 01 Feb 2007 09:58:15 +0100	[thread overview]
Message-ID: <45C1ABA7.80600@netfilter.org> (raw)
In-Reply-To: <42261c2c0701311431t6211428uffa34273c4dcc112@mail.gmail.com>

Hi,

Павел Коколемин wrote:
> I am using libnetfilter_conntrack for log all connections passing via my 
> router (new & destroy messages).
> 
> When LAN users start network scanners (NetLook, for example),
> sometimes I receive error in console:
> "nfnl_listen: recvmsg overrun: No buffer space available"
> generated in nfct_event_conntrack() (recvmsg() returns ENOBUFS error code).
> This message generated in nfnl_listen().

Increase netlink buffer size via nfnl_rcvsiz() (libnfnetlink), the 
default size is available in /proc/sys/net/core/rmem_max. BTW, this 
message means that you have probably lost some log messages because the 
rate was so high that the buffer could not back off.

-- 
The dawn of the fourth age of Linux firewalling is coming; a time of 
great struggle and heroic deeds -- J.Kadlecsik got inspired by J.Morris


  reply	other threads:[~2007-02-01  8:58 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-31 22:31 nfnl_listen: recvmsg overrun: No buffer space available" in nfct_event_conntrack() call Павел Коколемин
2007-02-01  8:58 ` Pablo Neira Ayuso [this message]
2007-02-01 13:56   ` Pablo Neira Ayuso
2007-02-01 17:31     ` Павел Коколемин

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