netdev - Re: IPV6 ndisc:: Bad NIC causing IPV6 NDP to stop working

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Message-ID: <1340266972.4604.4404.camel@edumazet-glaptop>
Date:	Thu, 21 Jun 2012 10:22:52 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Menny_Hamburger@...l.com
Cc:	netdev@...r.kernel.org
Subject: Re: IPV6 ndisc::  Bad NIC causing  IPV6 NDP to stop working

On Thu, 2012-06-21 at 08:59 +0100, Menny_Hamburger@...l.com wrote:
> Hi,
> 
> Our machines runs EL5.8 x86_64.
> We have witnessed several cases where we suspect that a bad NIC on the machine caused IPV6 neighbour discovery to stop working on all the other NICs - when this happens ping6 fails on every NIC we try it.
> From looking into the code I see that there is only a single socket assigned for NDP; Does it sound logical to allocate a socket per interface instead of a single global socket.
> I have found the following thread in LKML: https://lkml.org/lkml/2006/11/29/335, and it seems that this allocation issue still exists in EL5 based kernels - could this cause the above problem?
> 

What is a bad NIC, and why not fixing it ?



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