linux-kernel - Re: IPv6 patch mysteriously breaks IPv4 VPN

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Date:	Thu, 21 Apr 2016 10:08:00 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Valdis Kletnieks <Valdis.Kletnieks@...edu>, bjorn@...k.no,
	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: IPv6 patch mysteriously breaks IPv4 VPN

On 21.04.2016 04:24, Valdis Kletnieks wrote:
> I'll say up front - no, I do *not* have a clue why this commit causes this
> problem - it makes exactly zero fsking sense.
> 
> Scenario:  $WORK is blessed with a Juniper VPN system.  I've been
> seeing for a while now (since Dec-ish) an issue where at startup,
> the tun0 device will get wedged.  ifconfig reports this:
> 
> tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1400
>         inet 172.27.1.165  netmask 255.255.255.255  destination 172.27.1.165
>         inet6 fe80::6802:d95c:f3f4:2a6f  prefixlen 64  scopeid 0x20<link>
>         unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  (UNSPEC)
>         RX packets 0  bytes 0 (0.0 B)
>         RX errors 0  dropped 0  overruns 0  frame 0
>         TX packets 1  bytes 48 (48.0 B)
>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Can you show us a ip -d l l ?

Thanks,
Hannes