netdev - Re: BUG: IPv6 stops working after a while, needs ip ne del command to reset

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Date:	Tue, 17 Aug 2010 08:00:02 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Habets <thomas@...ets.pp.se>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: BUG: IPv6 stops working after a while, needs ip ne del command
 to reset

Le mardi 17 août 2010 à 07:35 +0200, Thomas Habets a écrit :
> On Mon, 16 Aug 2010, Thomas Habets wrote:
> > Am I not allowed to add addresses to lo? That I've deconfigured this address 
> > and rebooted the box to check if this matters.
> 
> It didn't help.
> 
> > I will re-check ethtool and Cisco router output for mismatches when it breaks 
> > again to make sure that there's no change or errors counting up.
> 
> IPv6 is currently not working and it's still 1000 Full on both sides 
> ("show int GiX/Y" and "ethtool eth0").
> No errors in "ethtool -S eth0" or "show int GiX/Y".
> 
> "ethtool eth0" output is the same as yesterday.
> 
> Here's the addresses and routing table as they are now, and have been 
> since reboot:
> 
> $ ip -6 a
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436
>      inet6 ::1/128 scope host
>         valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
>      inet6 2a00:800:752:1::5c:2/112 scope global
>         valid_lft forever preferred_lft forever
>      inet6 fe80::224:81ff:fea3:4424/64 scope link
>         valid_lft forever preferred_lft forever
> 
> 
> $ ip -6 r sh
> 2a00:800:752:1::5c:0/112 dev eth0  proto kernel  metric 256  mtu 1500
> advmss 1440 hoplimit 4294967295
> 
> fe80::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440
> hoplimit 4294967295
> 
> default via 2a00:800:752:1::5c:1 dev eth0  metric 1024  mtu 1500 advmss
> 1440 hoplimit 4294967295
> 
> $ ip -6 ne sh
> 2a00:800:752:1::5c:1 dev eth0 lladdr 00:22:55:17:4b:80 router STALE
> 
> [try ping6 again, no reply]
> 
> $ ip -6 ne sh
> 2a00:800:752:1::5c:1 dev eth0 lladdr 00:22:55:17:4b:80 router DELAY
> 
> [try ping6 again, no reply]
> 
> $ ip -6 ne sh
> 2a00:800:752:1::5c:1 dev eth0 lladdr 00:22:55:17:4b:80 router REACHABLE
> 

This seems a bit different than previous mail. Apparently discovery now
works ?

Could you have a tcpdump on both sides ?

Maybe your host is OK, but other side drops your ICMP packets ?

> [try ping6 again, no reply]
> 
> Configured network with /etc/network/interfaces:
> 
> auto lo
> iface lo inet loopback
> 
> allow-hotplug eth0
> iface eth0 inet static
>  	address x.x.x.x
>  	netmask 255.255.255.252
>  	broadcast x.x.x.x
>  	gateway x.x.x.x
>  	up ip a a 2a00:800:752:1::5c:2/112 dev eth0
>  	up ip r a default via 2a00:800:752:1::5c:1
>  	dns-nameservers x.x.x.x
>  	dns-search xxxx.net


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