IPv6 default routes / NM vs. kernel autoconfig
- From: Phil Mayers <p mayers imperial ac uk>
- To: networkmanager-list gnome org
- Subject: IPv6 default routes / NM vs. kernel autoconfig
- Date: Fri, 20 Jul 2012 15:56:43 +0100
All,
I work in the network team at an (almost) fully IPv6 enabled site. We
use a lot of Linux servers and desktops as part of the Network
infrastructure.
We recently rebooted one of our IPv6 routers, serving a subnet with two
IPv6 gateways. After the reboot, a Fedora 17 machine running the most
recent NM package had the following routing table entries, and no IPv6
connectivity:
::/0 fe80::21b:2bff:fec1:dcc1 UG 1 0 0 em1
::/0 fe80::217:e0ff:fe43:5941 UGDAe 1024 0 0 em1
::/0 fe80::21b:2bff:fec1:dcc2 UGDAe 1024 0 0 em1
Note that the lower-metric route is for the IPv6 host ending in dcc1,
but the two higher-metric routes, which I assume come from the kernel
autoconf, are different hosts - dcc1 and 5941.
We took a look at the router, and found that, before reboot, it had been
using blahblah:dcc1 as the link-local, but after reboot it started using
blahblah:dcc2.
The kernel autoconf seems to have picked this up - the Cisco routers
send an RA with lifetime=0 before going down - but what I am assuming is
the NetworkManager-installed static route didn't change.
My main question: What should happen in this situation? Is this a bug in NM?
As a secondary question: what is the eventual goal for IPv6 in
NetworkManager? Specifically, is the goal to suppress ALL the
kernel-based autoconf logic, and have NetworkManager drive the address
configuration?
I think this would be a VERY GOOD thing. The kernel autoconf has, in my
experience, a lot of problems. For example, it tries to configure every
interface by default - including vlan sub-interfaces, and members of
bridges or bonds. This is usually (very) unhelpful.
You can resort to /etc/sysctl.conf to hack around this, but it's messy.
In addition, the various sysctl knobs are not well-decomposed, or even
very obvious.
Comments welcome.
Cheers,
Phil
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