Hi, Am 10.07.2014 18:26, schrieb Dan Williams: > On Wed, 2014-07-09 at 17:27 +0200, Florian Klink wrote: >> Hi, >> >> Am 28.06.2014 00:04, schrieb Florian Klink: >>> Hi Dan, >>> >>> Am 27.06.2014 20:40, schrieb Dan Williams: >>>> On Fri, 2014-06-27 at 11:15 -0500, Dan Williams wrote: >>>>> On Fri, 2014-06-27 at 10:43 +0200, Florian Klink wrote: >>>>>> Hi, >>>>>> >>>>>> caused by some package upgrades, (I'm quite sure it is caused by dhcpcd >>>>>> upgrade from 6.3.2-1 to 6.4.0-1), I don't receive any more ipv6 default >>>>>> routes from DHCPv6-enabled networks. >>>>>> >>>>>> It suddenly stopped working in two different networks, while it still >>>>>> works on other machines, and the dhcpcd upgrade was also during this >>>>>> time. >>>>>> >>>>>> Arch Linux amd64 >>>>>> kernel 3.15.0 >>>>>> networkmanager 0.9.8.10-3 >>>>>> dhcpcd 6.4.0-1 >>>>>> >>>>>> I still receive an ipv6 address of the network, and can ping machines >>>>>> inside the network. >>>>>> >>>>>> Networkmanager log doesn't look really suspicios, I attached it anyways. >>> >>> I don't see any NAK in the attached systemd journal excerpt, so >>> something else must cause the default to disappear/not appear at all... >>> >>> Or do I need to enable some debug flags before? >>> >>> The IPv6 address gets assigned and stays there. I can ping6 hosts in the >>> same network without problems. >> >> I digged deeper into this. During connection, NetworkManager calls >> >> >>> # /usr/bin/dhcpcd -B -K -L -G -c >>> /usr/lib/networkmanager/nm-dhcp-client.action wlp3s0 >>> dhcpcd[7256]: version 6.4.0 starting >>> dhcpcd[7256]: DUID 00:01:00:01:1a:fd:69:ab:xx:xx:xx:xx:xx:xx >>> dhcpcd[7256]: wlp3s0: IAID a1:e4:2e:01 >>> dhcpcd[7256]: wlp3s0: rebinding lease of 172.23.100.20 >>> dhcpcd[7256]: wlp3s0: soliciting an IPv6 router >>> dhcpcd[7256]: wlp3s0: Router Advertisement from fe80::xxxx:xxxx:xxxx:xxxx >>> dhcpcd[7256]: wlp3s0: adding address 2002:xxxx:xxxx:0:xxxx:xxxx:xxxx:xxxx/64 >>> dhcpcd[7256]: wlp3s0: adding route to 2002:xxxx:xxxx::/64 >>> dhcpcd[7256]: wlp3s0: requesting DHCPv6 information >>> dhcpcd[7256]: wlp3s0: leased 172.23.100.20 for 864000 seconds >>> dhcpcd[7256]: wlp3s0: adding route to 172.23.0.0/17 >>> dhcpcd[7256]: wlp3s0: removing route to 172.23.0.0/17 > > With "method=auto" for IPv6, you should get an IPv6 default route set by > NetworkManager via your IPv6 default router. Then you should also > receive a second IPv6 address from the DHCPv6 lease, but the default > route shouldn't come from dhcpcd, it should be set by NetworkManager > based on the IPv6 router advertisement. Basically, dhcpcd shouldn't be > involved in setting the default route at all, because it doesn't have > full knowledge of the system and all the interfaces. The logs you > posted originally don't have enough detail to see what's going on here > though. > > Could you run NM with "--log-level=debug > --log-domains=dhcp6,ip6,device,core,hw" and see what gets printed out > for IPv6 operations after "Activation (wlp3s0) Beginning IP6 addrconf."? > > Thanks! > Dan
I ran NetworkManager with the parameters described and attached the log.
ipv6 method was set to auto.
Seems like I received two IPv6 prefixes this time (as the dialup router
recently changed its IPv6 prefix), but there's still no IPv6 default
route coming through...
Florian
>
>
>>
>>
>> I disabled NetworkManagers ip handling completely:
>>> [ipv4]
>>> method=link-local
>>> ignore-auto-routes=true
>>> ignore-auto-dns=true
>>>
>>> [ipv6]
>>> method=link-local
>>> ignore-auto-routes=true
>>> ignore-auto-dns=true
>>
>>
>> ... And started dhcpcd on my own afterwards:
>>
>>> dhcpcd[9996]: version 6.4.0 starting
>>> dhcpcd[9996]: wlp3s0: adding address fe80::xxxx:xxxx:xxxx:xxxx
>>> dhcpcd[9996]: DUID 00:01:00:01:1a:fd:69:ab:xx:xx:xx:xx:xx:xx
>>> dhcpcd[9996]: wlp3s0: IAID a1:e4:2e:01
>>> dhcpcd[9996]: wlp3s0: soliciting an IPv6 router
>>> dhcpcd[9996]: wlp3s0: rebinding lease of 172.23.100.20
>>> dhcpcd[9996]: wlp3s0: Router Advertisement from fe80::xxxx:xxxx:xxxx:xxxx
>>> dhcpcd[9996]: wlp3s0: adding address 2002:xxxx:xxxx:0:xxxx:xxxx:xxxx:xxxx/64
>>> dhcpcd[9996]: wlp3s0: adding route to 2002:xxxx:xxxx::/64
>>> dhcpcd[9996]: wlp3s0: adding default route via fe80::xxxx:xxxx:xxxx:xxxx
>>> dhcpcd[9996]: wlp3s0: requesting DHCPv6 information
>>> dhcpcd[9996]: forked to background, child pid 10066
>>
>> And as you can see, the IPv6 default route gets added!
>>
>>
>> I think the problem is the -G parameter ("Don't set any default
>> routes.") thats passed to dhcpcd by NetworkManager.
>> What do you think?
>>
>> Florian
>>
>>
>>>
>>>
>>>>>
>>>>> The default route actually comes from the RA, not DHCPv6. But check
>>>>> your logs for a "NAK" coming from dhcpcd. If you see that, then I'll
>>>>> bet its the same problem that I've been corresponding with a user over
>>>>> IRC about. dhcpcd touches addresses internally, and when it gets a NAK
>>>>> it actually removes the IP address from the interface, which could cause
>>>>> the kernel to remove the default route too. Unfortunately, due to an
>>>>> issue in NetworkManager, it is never notified of this event, and ignores
>>>>> the fact that things changed, and thus doesn't restore the default
>>>>> route.
>>>>>
>>>>> Let me know if you do see "NAK" in your logs...
>>>>
>>>> If you do, please try the attached patch (for NM 0.9.8.x) and let the
>>>> NAK happen again. If you again lose the default route, then please grab
>>>> logs from wherever your syslog daemon facility goes too. If you're
>>>> using systemd, that'll be "journalctl -b -u NetworkManager", otherwise
>>>> it's /var/log/syslog, /var/log/messages, /var/log/daemon.log,
>>>> or /var/log/NetworkManager.log depending on your distro.
>>>>
>>>> Thanks!
>>>> Dan
>>>>
>>>
>>>
>>>
>>>
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>>>
>>
>>
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--
Florian Klink
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