netdev - Re: netfilter/iptables and network interface names

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Date:	Thu, 4 Feb 2010 19:44:38 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	Thomas Woerner <twoerner@...hat.com>, netdev@...r.kernel.org,
	Netfilter Developer Mailing List 
	<netfilter-devel@...r.kernel.org>
Subject: Re: netfilter/iptables and network interface names


On Thursday 2010-02-04 17:49, Patrick McHardy wrote:
>Jan Engelhardt wrote:
>>> The kernel also forbids ".".
>> 
>> My first thought was the same, but:
>> 
>> a) Interestingly, it does not prohibit '.'
>> 
>> 	ip tunnel add foo0.3 mode sit local 1.2.3.4 remote 5.6.7.8
>> 
>> b) The '.' is to be seen as valid as far as xtables.c goes, so
>>    as to match VLAN interfaces.
>
>Ah of course, its only invalid at the beginning of the name.
>
Nope:

19:44 borg:/home/jengelh # ip tunnel add .3 mode sit local 1.2.3.6 remote
5.6.7.7
19:44 borg:/home/jengelh # ip a
17: .3: <POINTOPOINT,NOARP> mtu 1480 qdisc noop state DOWN 
    link/sit 1.2.3.6 peer 5.6.7.7
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