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From: Daniel Corbe <daniel@corbe.net>
Date: Sat, 7 Dec 2019 11:16:54 -0500
Message-ID: <CAMxLOn0vRkynO7tDD=jdOm6MaF2Ecn-b1Q+9-eLJnYd2K4ERvw@mail.gmail.com>
Subject: IPv6 Forwarding Troubles
To: alpine-user@lists.alpinelinux.org
Content-Type: text/plain; charset="UTF-8"

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?