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Date:	Tue, 17 Apr 2007 20:00:38 -0700
From:	Andrew Morton <>
Subject: Re: [Bugme-new] [Bug 8349] New: Manually set IPv6 default route

On Tue, 17 Apr 2007 18:45:12 -0700 wrote:

>            Summary: Manually set IPv6 default route ignored
>     Kernel Version:
>             Status: NEW
>           Severity: normal
>              Owner:
>          Submitter:
> Most recent kernel where this bug did *NOT* occur:
> Distribution: Debian sid
> Hardware Environment: x86 (Pentium 4/MMX)
> Software Environment: iproute2-ss060323, ifupdown 0.6.8
> Problem Description:
> Default routes added to the IPv6 routing table, which are not coming from
> autoconfiguration, seem to be ignored. Subsequently, IPv6 routing is disrupted,
> and for instance calls to connect() fail with an ENETUNREACH error.
> Steps to reproduce:
> 0. Find an IPv6-enabled box on an IPv6-free network. In the absence of any other
> configuration, the routing table contains the single line:
> fe80::/64 dev eth0 ...
> 1. Add a default route:
> ip -6 ro add default via fe80::1 dev eth0
> 2. Try to do IPv6, for instance:
> # ping6 2001:4978:1:110:0:ac:ce55:1b1e
> connect: Network is unreachable
> (returns instantly, no packet is sent)
> This bug is present in the last stable kernel, and in 2.6.21-rc7. I
> actually came across this bug on a server on a network where IPv6 is routed and
> advertised, but with autoconfiguration disabled on this server. It *seems* to me
> that if the interface is brought up with accept_ra enabled, default routes,
> including the one got from RA and ones input by hand later will work, whereas if
> it is brought up with accept_ra disabled (or no RA is received), the problem
> will occur. Note that routes with a non-null prefix length, such as 3 or 1, work
> fine.
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