Support port forwarding on both 127.0.0.1 and ::1

[encounter]

Description

As of now, the default port forwarding doesn't properly forward on both IPv4 (127.0.0.1) and IPv6 (::1) interfaces:

➜ docker run --name nginx -p 80:80 -d nginx
# note that docker is forwarding on both 0.0.0.0 and ::
➜ docker ps                                
CONTAINER ID   IMAGE     COMMAND                  CREATED              STATUS              PORTS                               NAMES
68a055ac7e3f   nginx     "/docker-entrypoint.…"   About a minute ago   Up About a minute   0.0.0.0:80->80/tcp, :::80->80/tcp   nginx
➜ curl -Ss "http://127.0.0.1" -o /dev/null && echo ok                 
ok
➜ curl -Ss "http://[::1]" -o /dev/null && echo ok                     
curl: (7) Failed to connect to ::1 port 80 after 2 ms: Couldn\'t connect to server
➜ limactl shell docker curl -Ss "http://127.0.0.1" -o /dev/null && echo ok
ok
➜ limactl shell docker curl -Ss "http://[::1]" -o /dev/null && echo ok
ok

The default rule isn't expressive enough to accomplish this:

- guestIP: "127.0.0.1" # matches bind addresses "0.0.0.0", "::", and "::1"
  hostIP: "127.0.0.1" # only forwards on IPv4

I would expect the default rule to be:

• If 127.0.0.1 or 0.0.0.0, forward on 127.0.0.1
• If ::1 or ::, forward on ::1

Or is there already a combination of options to accomplish this?

[henrik242]

@afbjorklund Any idea if this is on the roadmap?

[afbjorklund]

No idea, as far as I know it all uses IPv4