Hello All,
I'm seeing strange behavior inside an Alpine Linux VM.
I'm trying to enable IPv6 forwarding via sysctl. In its default
configuration, Alpine is getting an IPv6 address and a gateway and I'm
able to ping6 www.google.com
I have neighbors:
# ip -6 neigh show
fe80::fc00:2ff:fe73:a13e dev eth0 lladdr fe:00:02:73:a1:3e router used
0/0/0 probes 1 STALE
I have a default gateway:
# ip -6 route list
2001:19f0:9002:1c2f::/64 dev eth0 metric 256 expires 0sec
fe80::/64 dev eth0 metric 256
default via fe80::fc00:2ff:fe73:a13e dev eth0 metric 1024 expires 0sec
ff00::/8 dev eth0 metric 256
When I do this:
# sysctl -w net.ipv6.conf.all.forwarding=1
I lose my default gateway:
# ip -6 route list
2001:19f0:9002:1c2f::/64 dev eth0 metric 256 expires 0sec
fe80::/64 dev eth0 metric 256
anycast 2001:19f0:9002:1c2f:: dev eth0 metric 0
anycast fe80:: dev eth0 metric 0
ff00::/8 dev eth0 metric 256
Now I no longer have any IPv6 connectivity. Can anyone point me in
the right direction here?
Hey Daniel,
that is correct. The sysctl that you are looking for is accept_ra=2.
Best,
Nico
p.s.: Fell for this many, many times before...
Daniel Corbe <daniel@corbe.net> writes:
> Hello All,
>
> I'm seeing strange behavior inside an Alpine Linux VM.
>
> I'm trying to enable IPv6 forwarding via sysctl. In its default
> configuration, Alpine is getting an IPv6 address and a gateway and I'm
> able to ping6 www.google.com
>
> I have neighbors:
>
> # ip -6 neigh show
> fe80::fc00:2ff:fe73:a13e dev eth0 lladdr fe:00:02:73:a1:3e router used
> 0/0/0 probes 1 STALE
>
> I have a default gateway:
>
> # ip -6 route list
> 2001:19f0:9002:1c2f::/64 dev eth0 metric 256 expires 0sec
> fe80::/64 dev eth0 metric 256
> default via fe80::fc00:2ff:fe73:a13e dev eth0 metric 1024 expires 0sec
> ff00::/8 dev eth0 metric 256
>
> When I do this:
>
> # sysctl -w net.ipv6.conf.all.forwarding=1
>
> I lose my default gateway:
>
> # ip -6 route list
> 2001:19f0:9002:1c2f::/64 dev eth0 metric 256 expires 0sec
> fe80::/64 dev eth0 metric 256
> anycast 2001:19f0:9002:1c2f:: dev eth0 metric 0
> anycast fe80:: dev eth0 metric 0
> ff00::/8 dev eth0 metric 256
>
> Now I no longer have any IPv6 connectivity. Can anyone point me in
> the right direction here?
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