netdev - Re: Connection tracking and vlan

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Message-ID: <4AEB13DE.2030200@trash.net>
Date:	Fri, 30 Oct 2009 17:27:10 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Herbert Xu <herbert@...dor.apana.org.au>,
	Adayadil Thomas <adayadil.thomas@...il.com>,
	netdev@...r.kernel.org
Subject: Re: Connection tracking and vlan

Eric Dumazet wrote:
> Herbert Xu a écrit :
>> On Fri, Oct 30, 2009 at 04:31:50PM +0100, Eric Dumazet wrote:
>>> Same thing if you have two interfaces, eth0 & eth1 : IP conntrack tuples dont
>>> include interface name/index
>> Indeed, but imagine what happens when eth0 is the LAN and eth1 is
>> the wild wild Internet.  Do you really want their packets to mix?
>>
> 
> No, Abayadi needs firewall rules (or RPF), before entering conntrack.
> 
> Allowing spoofed packets to come from wild Internet would be...
> interesting in many aspects.
> 
> And since some setups use several links to LAN, several links to
> Internet, its user policy decisions.

Correct, users need to take care of this manually.
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