netdev - Re: No longer able to add iptunnel interface to bridge?

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Date:	Mon, 15 Apr 2013 11:12:13 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Tomas Agartz <tlund@....se>
Cc:	netdev@...r.kernel.org
Subject: Re: No longer able to add iptunnel interface to bridge?

On Mon, 15 Apr 2013 18:14:32 +0200 (CEST)
Tomas Agartz <tlund@....se> wrote:

> After rebooting my router/firewall (Debian Wheezy with debian 3.2.41-2 
> kernel), I am no longer able to add an iptunnel to a bridge interface.
> 
> The iptunnel is configured like this:
> 
> iptunnel add TUNNEL mode ipip remote x.x.x.x local y.y.y.y ttl 32
> ifconfig TUNNEL z.z.z.z netmask 255.255.255.254 up
> 
> and this is what strace shows when I try to do "brctl addif test TUNNEL":
> 
> ioctl(3, SIOCBRADDIF, 0x7fffafba64c0)   = -1 EINVAL (Invalid argument)
> ioctl(3, SIOCDEVPRIVATE, 0x7fffafba64c0) = -1 EINVAL (Invalid argument)
> 
> I have no idea if I might have changed something in userspace by misstake, 
> or if there has been a change in the kernel since last reboot. The same 
> machine has a different bridge with an L2TPv3 tunnel added, this works 
> fine.
> 
> I understand that the info here is not much to go on, but I am unsure what 
> else to attach. Plese ask for further info and I shall provide it!
> 
> Best regards,
> Tomas
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You created a network level (L3) tunnel, which starts with IP header.
Bridging requires an Ethernet like (L2) tunnel, where packets start with Ethernet header.
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