How to enable IPv6 in Docker?

General
1

I am using docker on an IPv6 only host.

I did it as document

/etc/docker/daemon.json
{
  "ipv6": true,
  "fixed-cidr-v6": "xxxx:xxxx:xxxx:xxxx::/64"
}

Restart docker.

Create a new network

docker network create --ipv6 --subnet=xxxx:xxxx:xxxx::/64 awx

Connect a running application inside docker to the new network

docker network connect awx awx_web

From here I know should do these two things

  • /usr/sbin/sysctl net.ipv6.conf.interface_name.proxy_ndp=1
  • /usr/bin/ip -6 neigh add proxy $(docker inspect --format {{.NetworkSettings.GlobalIPv6Address}} container_name) dev interface_name"

I ran ip -6 route got

unreachable ::/96 dev lo metric 1024 error -113 pref medium
unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 error -113 pref medium
unreachable 2002:xxxx::/24 dev lo metric 1024 error -113 pref medium
unreachable 2002:xxxx::/24 dev lo metric 1024 error -113 pref medium
unreachable 2002:xxxx::/32 dev lo metric 1024 error -113 pref medium
unreachable 2002:xxxx::/28 dev lo metric 1024 error -113 pref medium
unreachable 2002:xxxx::/32 dev lo metric 1024 error -113 pref medium
unreachable 2002:xxxx::/19 dev lo metric 1024 error -113 pref medium
xxxx:xxxx:xxxx::/64 dev br-xxxxxxxx proto kernel metric 256 pref medium
xxxx:xxxx:xxxx::/64 dev br-xxxxxxxx metric 1024 pref medium
xxxx:xxxx:xxxx:xxxx::/64 dev lan0 proto kernel metric 256 pref medium
xxxx:xxxx:xxxx:xxxx::/64 dev docker0 proto kernel metric 256 pref medium
xxxx:xxxx:xxxx:xxxx::/64 dev docker0 metric 1024 pref medium
unreachable xxxx:xxxx::/32 dev lo metric 1024 error -113 pref medium
fb80::/64 dev lan0 proto kernel metric 256 pref medium
fb80::/64 dev docker0 proto kernel metric 256 pref medium
fb80::/64 dev br-xxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev br-xxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev br-xxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev br-xxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev br-xxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev xxxxxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev xxxxxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev xxxxxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev xxxxxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev xxxxxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev br-xxxxxxxx proto kernel metric 256 pref medium
fb80::/64 dev xxxxxxxxxxx proto kernel metric 256 pref medium
default via xxxx:xxxx:xxxx:xxxx::ffff dev lan0 metric 1 pref medium

Then ran

# /usr/sbin/sysctl net.ipv6.conf.lan0.proxy_ndp=1
(sccessed)

# ip -6 neigh add proxy $(docker inspect --format {{.NetworkSettings.Networks.awx.GlobalIPv6Address}} awx_web) dev lan0
(sccessed)

I check IPv6Address value in awx_web container

# docker inspect --format {{.NetworkSettings.Networks.awx.GlobalIPv6Address}} awx_web
xxxx:xxxx:xxxx::2

Login to the web container check ip a also can find this IP(xxxx:xxxx:xxxx::2). But can’t ping remote server by IPv6 in the container.

Does the dev lan0 right in the ip -6 neigh add proxy command?

Why the networks didn’t bind together?