DHCPv6 support in Network Manager isn't RFC compliant

Paul Wouters paul at xelerance.com
Fri Jul 29 14:00:44 UTC 2011

On Fri, 29 Jul 2011, Tore Anderson wrote:

> There's two potential explanations for that that I'm aware of:
> 1) The «Require IPv4 for this connection to complete» NM setting is
> unfortunately checked by default, see
> <https://bugzilla.redhat.com/show_bug.cgi?id=538499> and
> <https://bugs.launchpad.net/bugs/761558>.

That is still the case for Fedora 14 with all updates :(

I had to disable it. That in itself is hard because the connection
(since it has only failed) shows up at the BOTTOM of the network manager
wireless networks, since it is sorted on "last connection" which does
not take failed connections into account ("never" is sorted to the bottom)

I think it would be much better to keep failed but just attempted connections
at the top of the list in network manager, if the sort order is connection time
and not alphabetical.

> 2) Fedora, for some reason I cannot fully comprehend, drops DHCPv6
> replies in its default ip6tables ruleset, see
> <https://bugzilla.redhat.com/show_bug.cgi?id=591630> (apparently a WONTFIX).

I can confirm this is still an issue and I've updated the bug to reflect that.
Stopping the firewall did not help me on ietf-v6ONLY though. I still got not
DNS entry in /etc/resolv.conf and on top of that my routing seemed to not have
a working default route.

[paul at thinkpad ~]$ traceroute6 -n 2001:888:2003:1004:c2ff:eeff:fe00:136
traceroute to 2001:888:2003:1004:c2ff:eeff:fe00:136 (2001:888:2003:1004:c2ff:eeff:fe00:136), 30 hops max, 80 byte packets
  1  2001:df8:0:112:221:5cff:fe54:4fe5  3005.373 ms !H  3007.441 ms !H *
[paul at thinkpad ~]$

[paul at thinkpad ~]$ ip -6 ro li default
default dev wlan0  proto static  metric 1024  expires 2147157sec mtu 1500 advmss 1440 hoplimit 0
default via fe80::212:1e00:70e7:bc00 dev wlan0  proto kernel  metric 1024  mtu 1500 advmss 1440 hoplimit 64
default via fe80::205:8500:708e:3c00 dev wlan0  proto kernel  metric 1024  expires 1716sec mtu 1500 advmss 1440 hoplimit 64

So, IPv6only is better then it was one or two fedora releases ago, but it seems to not
be fully working on Fedora-14, and from listening to other people, has not fully been
resolved on Fedora-15 either....


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