IPv6 breakage in NetworkManager

[Dan Irwin]

I have had some success in identifying the root cause of this. Today, IPv6
broke again, and I had some spare time to debug it.

It seems as though NetworkManager is setting up an IPv6 default route via
em1, even though I had em1 disabled.

Earlier, I had two default routes. One via em1, another via wlp2s0 (aka
wlan0):

default via fe80::d267:e5ff:feb5:235b dev wlp2s0  proto static  metric 1024
default via fe80::d267:e5ff:feb5:235b dev em1  proto ra  metric 1024
expires 593sec

One appears to be static, the other is received via ra on the disabled
interface.

I can only imagine this means my default route in IPv6 land has been
switching between the two interfaces. To me, this explains the dropped ssh
sessions, web browsing timeouts, and other flaky  behaviour which I am
attributing to loss of IPv6 DNS packages.

So, NetworkManager bug or kernel bug?

I can only assume NetworkManager is responsible for this.

Cheers




On Thu, Jan 23, 2014 at 1:29 PM, Dan Irwin <rummymobile at gmail.com> wrote:

> Hi Wolfgang,
>
> I'm not using dhclient6, or dhcpv6 at all on the subnets I connect to.
> Checking my system I don't see dhclient6 running. Sounds like a similar
> problem though.
>
> I might try the updated policy package mentioned in your bz - but only if
> the changelog seems like it might help.
>
> Thanks
>
>
> On Thu, Jan 23, 2014 at 10:07 AM, Wolfgang S. Rupprecht <
> wolfgang.rupprecht at gmail.com> wrote:
>
>>
>> Dan Irwin <rummymobile at gmail.com> writes:
>> > Seeing significant issues with IPv6. After some time, IPv6 completely
>> > seems to stop working. IPv4 is unaffected.
>>
>> I'm seeing an IPv6 breakage in NetworkManager/dhclient6 too.  At first
>> it looked like an Selinux problem (there was an avc), but fixing that
>> didn't stop the problem with NM not getting a working IPv6 address via
>> dhclient6.  BZ#1055226
>> https://bugzilla.redhat.com/show_bug.cgi?id=1055226
>>
>> > Re-connecting to wifi seems to restore IPv6 connectivity.
>>
>> Mine is via an ethernet connection to my cable modem which connects to
>> Comcast.  I can do a "systemctl restart NetworkManager" in order to get
>> an ipv6 address.
>>
>> -wolfgang
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