wg-quick up automation fails

[Silvan Nagl]

Hi,

as i already mentioned the problem persists on master branch for me.

Greetings,

53c70r

On 6/2/19 8:32 AM, XRP wrote:
> On Sun, 2019-06-02 at 01:49 +0200, Silvan Nagl wrote:
>> G'day,
>>
>> i recently upgrade WireGuard to the latest shipped Debian version
>> (0.0.20190406-1) and noticed my wg-quick created interface did not
>> come
>> up as usual anymore. (Also tried the git master branch) I tried to
>> single command trough wg-quick's automation to reproduce the error;
>>
>> automatic:
>>
>> [#] ip link add Y type wireguard
>> [#] wg setconf Y /dev/fd/63
>> [#] ip address add X.X.X.X/32 dev Y
>> [#] ip address add fc00::XXXX/128 dev Y
>> [#] ip link set mtu XXXX up dev Y
>> [#] resolvconf -a tun.Y -m 0 -x
>> [#] wg set Y fwmark 51820
>> [#] ip -6 route add ::/0 dev Y table 51820
>> RTNETLINK answers: No such device
>> [#] resolvconf -d tun.Y
>> [#] ip link delete dev Y
>>
>> manual:
>>
>>> ip link add Y type wireguard
>>> wg setconf Y <(wg-quick strip /etc/wireguard/Y.conf)
>>> ip address add X.X.X.X/32 dev Y
>>> ip address add fc00::XXXX/128 dev Y
>>> ip link set mtu 1268 up dev Y
>>> resolvconf -a tun.X -m 0 -x
>>> wg set Y fwmark 51820
>>> ip -6 route add ::/0 dev Y table 51820
>> < RTNETLINK answers: No such device
>>
>> (MTU may be to low here so i set it higher again)
>>
>>> ip link set mtu 1420 up dev Y
>>> ip -6 route add ::/0 dev Y table 51820 (works now)
>> breaks up @ this point because of error handling...
>>
>> Additionally it could be possible the MTU isn't set correctly.
> I had a similar problem where I got a "RTNETLINK answers: No such
> device" error. After that I tried to use the wg-quick version in the
> master branch and that fixed my problem. I hope that helps.
>
> (MTU for IPv6 must be 1280 bytes at least.)
>