[arch-general] Ping: 100% package loss

[Thorsten Jolitz]

Thorsten Jolitz via arch-general <arch-general at archlinux.org> writes:

Hello,
following up to my own post:

> Marcel Hoppe via arch-general <arch-general at archlinux.org> writes:
>
> Hi Marcel, Hi Robin,
>
> thanks for your answers.
>
>> I resolved the same problem 😉 on my systems I run the networkmanager and
>> this works long time - I'm not sure but I think the problem was that
>> systemd gets or starts its own revolver service. After disabling it and
>> deleting the linked resolve.conf the networkmanager creates it after a
>> restart again and it works.
>
> In Arch it's all about IPv6 it seems, so I did not want to disable
> it. Instead I deleted the old resolve.conf (it was replaced
> automatically by systemd). I replaced one (probably wrong) reference to
> IPv4 with IPv6 in my config, and started and enabled the network service
> again.
>
> Now pinging works for both protocols, and my internet connection went
> from incredibly slow to more or less acceptable.

So yesterday it worked, pinging IPv6 adresses as well as having
acceptable internet connection speed.
Today not anymore, although I did not change anything (ok, wasn't there
a kernel update yesterday?)

Any help interpreting this messages would be appreciated:
,----
| Jan 28 13:03:58 arch systemd[1]: Timed out waiting for device
| sys-subsystem-net-devices-service.device.
| -- Subject: Unit sys-subsystem-net-devices-service.device has failed
| -- Defined-By: systemd
| -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
| --
| -- Unit sys-subsystem-net-devices-service.device has failed.
| --
| -- The result is timeout.
| Jan 28 13:03:58 arch systemd[1]: Dependency failed for dhcpcd on
| service.
| -- Subject: Unit dhcpcd at service.service has failed
| -- Defined-By: systemd
| -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
| --
| -- Unit dhcpcd at service.service has failed.
| --
| -- The result is dependency.
| Jan 28 13:03:58 arch systemd[1]: dhcpcd at service.service: Job
| dhcpcd at service.service/start failed with result 'dependency'.
`----

Just time out because of lousy internet connecton?

,----
|   /run:
|   -rw-r--r--  1 root root    5 28. Jan 09:56 dhcpcd.pid
`----
,----
| $ ps 1952
|   PID TTY      STAT   TIME COMMAND
|  1952 ?        Ss     0:00 dhcpcd
`----

At startup, when calling dhcpcd, messages indicate that things worked
out, but it seems the service never really started?

> PS
> ,----
> | $ ping -c 3 www.google.com
> | PING www.google.com(waw02s07-in-x04.1e100.net
> | (2a00:1450:401b:802::2004%2)) 56 data bytes
> | 64 bytes from waw02s07-in-x04.1e100.net (2a00:1450:401b:802::2004):
> | icmp_seq=1 ttl=53 time=54.2 ms
> | 64 bytes from waw02s07-in-x04.1e100.net (2a00:1450:401b:802::2004):
> | icmp_seq=2 ttl=53 time=49.2 ms
> | 64 bytes from waw02s07-in-x04.1e100.net (2a00:1450:401b:802::2004):
> | icmp_seq=3 ttl=53 time=50.2 ms
> | 
> | --- www.google.com ping statistics ---
> | 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
> | rtt min/avg/max/mdev = 49.253/51.266/54.294/2.187 ms
> `----
>
> ,----
> | $ ping -c 3 ipv6.google.com
> | PING ipv6.google.com(waw02s08-in-x0e.1e100.net
> | (2a00:1450:401b:803::200e%2)) 56 data bytes
> | 64 bytes from waw02s08-in-x0e.1e100.net (2a00:1450:401b:803::200e):
> | icmp_seq=1 ttl=53 time=82.3 ms
> | 64 bytes from waw02s08-in-x0e.1e100.net (2a00:1450:401b:803::200e):
> | icmp_seq=2 ttl=53 time=48.7 ms
> | 64 bytes from waw02s08-in-x0e.1e100.net (2a00:1450:401b:803::200e):
> | icmp_seq=3 ttl=53 time=48.8 ms
> | 
> | --- ipv6.google.com ping statistics ---
> | 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
> | rtt min/avg/max/mdev = 48.754/59.986/82.355/15.819 ms
> `----
>
> ,----
> | $ ping -c 3 www.web.de
> | PING www.g-ha-web.de (82.165.230.17) 56(84) bytes of data.
> | 64 bytes from bap.web.de (82.165.230.17): icmp_seq=1 ttl=247 time=226 ms
> | 64 bytes from bap.web.de (82.165.230.17): icmp_seq=2 ttl=247 time=27.8
> | ms
> | 64 bytes from bap.web.de (82.165.230.17): icmp_seq=3 ttl=247 time=27.4
> | ms
> | 
> | --- www.g-ha-web.de ping statistics ---
> | 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
> | rtt min/avg/max/mdev = 27.429/93.814/226.124/93.557 ms
> `----
>
>> Greets,
>> Marcel
>>
>> Am 22.01.2017 17:31 schrieb "Robin via arch-general" <
>> arch-general at archlinux.org>:
>>
>>> Hi,
>>>
>>> seems like a ipv6 related problem. Your DNS Lookup is v4, first ping is
>>> v6 and second ping is v4 again. Try to ping the ipv4 address of
>>> google.com. But im pretty sure this is not arch related.
>>>
>>> Maybe you should try to disable ipv6 system wide and then check if it
>>> works.
>>>
>>> Cheers,
>>> Robin
>>> > Hello List,
>>> > sometime age my msmtp imap connections just stopped working.
>>> > Investigating the cause, I checked quite a lot of things, and came
>>> > across the ping "100% package loss" problem:
>>>
>>

-- 
cheers,
Thorsten