Accessing docker-compose containers via ipv6 from the outside of the docker host

milkpirate

3/22/24, 11:14 PM

I have the following (simplified) docker(-compose) setup and would like access the nginx container from the laptop. A ping from the laptop to the docker-compose gateway (fd..2222.0.0.1/80) works fine but to fd..2222.0.0.2/80 doesnt work.

I already tried to advertise a route via radvd (running on the Server):

interface wlp1s0 {
    IgnoreIfMissing on;
    AdvSendAdvert on;
    MaxRtrAdvInterval 600;

    route fddd::2222:0:0:0/80 {
        AdvRouteLifetime 900;
        AdvRoutePreference low;
    };
};

The route gets added to the laptop:

$ ip -6 -br r
...
fddd::2222:0:0:0/80 via fe80::xxxx:xxxx:xxxx:xxxx dev wlan0 proto ra metric 1024 expires 684sec pref low
...

but theres still no ping getting through. Could you help me getting this to work?

$ ip -6 -br a   # Server
lo               UNKNOWN        ::1/128
wlp1s0           UP             ... fddd::2c2:c6ff:febd:862a/64 ...
docker0          DOWN           fddd::1111:0:0:1/80 fe80::xxxx/64 fe80::1/64
br-ae6409628391  UP             fddd::2222:0:0:1/80 fe80::xxxx/64 fe80::1/64

215

0 + 7

networking

ipv6

radvd

docker

docker-compose

Jaromanda X

3/22/24, 11:35 PM

does IPv4 ping work?

milkpirate

3/23/24, 9:08 AM

Ping from where to where? Laptop --ipv4--> nginx will not work, since DC implements NAT. Laptop --ipv4--> Server works fine as well as `curl Server:8080` since nginx does have the port exposed to the host via `-p 8080:80`.

Jaromanda X

3/23/24, 9:53 AM

I must misunderstand your setup ... so, you can't ping using ipv6, but there's no similar router for ipv4?

milkpirate

3/23/24, 6:15 PM

Well yes. But thats not extraordinary. IPv6 and 4 do not have to have the same connectivity. From the Laptop I cant ping4 nginx anyway since its NATed by Docker(-Compose). But IPv4 is out of question here. Why are you asking?

Jaromanda X

3/23/24, 11:11 PM

to see if there's ANY connectivity at all

milkpirate

3/24/24, 1:26 PM

Yes, there is. Outgoing comm. from nginx to e.g. google works fine (thought all layers, 4 and 6).

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