From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: Why is gre0 auto-created, and can we fix it?
Date: Tue, 03 Jan 2012 14:59:31 -0500 (EST)
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From: Ben Greear <greearb@candelatech.com>
Date: Tue, 03 Jan 2012 11:49:50 -0800

> As far as I can tell, no other interfaces are auto-created
> in this manner.

ip6tnl0 and sit0 do it too, just grep for alloc_netdev() under
net/{ipv4,ipv6}/