Re: Multiple IPv6 RAs and static routes with metric 1

[Pavel Simerda <psimerda redhat com>]

Moved to bugzilla:

https://bugzilla.gnome.org/show_bug.cgi?id=692279

----- Original Message -----
> From: "Martin Jackson" <mhjacks swbell net>
> To: networkmanager-list gnome org
> Sent: Tuesday, January 22, 2013 2:29:40 AM
> Subject: Multiple IPv6 RAs and static routes with metric 1
> 
> Hello,
> 
> First, let me thank you for all of your hard work in developing and
> maintaining network-manager.  It makes life with a Linux laptop much
> simpler.
> 
> I have observed a behavior in network-manager in both Ubuntu (12.10)
> and
> Fedora (18).  In the presence of multiple routers advertising
> defaults,
> n-m seems to insert a static default route for one of them, with
> metric
> 1.  Here is example output from my Fedora system:
> 
> default via fe80::5054:ff:fe01:b6dc dev eth0  proto static  metric 1
> default via fe80::5054:ff:fe01:b6dc dev eth0  proto ra  metric 1024
> expires 2sec
> default via fe80::5054:ff:fe2f:62c2 dev eth0  proto ra  metric 1024
> expires 9sec
> 
> The Ubuntu system's output looks similar.
> 
> I believe that the addition of the "static metric 1" route is
> incorrect,
> as static routes of this type persist even when the router in
> question
> is no longer doing router advertisements.  In that case, the system
> will
> use that route in preference to the other router, which may still be
> doing router advertisements.  This creates issues when multiple
> routers
> are correctly advertising on the same link, and the intention is to
> provide a failover capability, without the complications of a first
> hop
> redundancy protocol.
> 
> I am in control of both of the advertising routers and can enable
> debug
> if needed on either the client systems or the advertising routers
> (which
> are virtual Ubuntu systems running Quagga).
> 
> I have filed a bug with Ubuntu
> (https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1101825),
> but
> this seemed like a better place to address this - I see that recently
> there has been some discussion about IPv6 semantics on this list and
> some recent patches for IPv6, so this discussion might be timely.
> 
> Thanks,
> Marty
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