netdev - Re: [Bugme-new] [Bug 28282] New: forwarding turns autoconfiguration off

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Date:	Tue, 08 Feb 2011 13:44:21 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	akpm@...ux-foundation.org
Cc:	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, hadmut@...isch.de
Subject: Re: [Bugme-new] [Bug 28282] New: forwarding turns
 autoconfiguration off

From: Andrew Morton <akpm@...ux-foundation.org>
Date: Tue, 8 Feb 2011 13:34:08 -0800

>> Linux ethernet interfaces do not use autoconfiguration and do ignore router
>> advertisings if the packet forwarding is turned on in the configuration (i.e. 
>> /proc/sys/net/ipv6/conf/eth0/forwarding set to 1)
>> 
>> 
>> This might be wrong.
>> 
>> IPv6 network devices can have multiple IPv6 addresses and server several
>> purposes at the same time. A machine can have a statically assigned local IPv6
>> address and act as a router (e.g. to a virtual machine or a VPN tunnel) and
>> thus needs to turn forwarding on, while at the same time it needs to listen to
>> router advertisements and autoconfigure, e.g. because a network is connected to
>> the internet through a DSL router with dynamically assigned network adresses,
>> either through direct IPv6 assignment or a 6to4 tunnel. 
>> 
>> So there are cases where you need to have autoconfiguration of an IP address
>> and forwarding on the same interface at the same time. Therefore, it might be
>> technically wrong to have this mutually exclusive. 

This is a case where we're probably just following what the RFC documents
state we should do, which means unless you can provide clear reference to
a specification that states we should behave otherwise this isn't changing.
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