Docker-proxy translate ipv6 traffic to ipv4

Docker Hub
1

I found ipv6 traffic to my container was translated to ipv4 when I monitor docker container’s traffic using tcpdump. Based on my research, I think docker-proxy has done the translation, it may use some iptables rules to achieve the translation.

[root@localhost /root]# ps -elf | grep docker
4 S root       24854   20579  0  80   0 - 287134 futex_ 12:58 ?       00:00:00 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 80 -container-ip 172.18.0.6 -container-port 80

Is there any way I can change the container-ip above to ipv6, so no translation happens, or any other approaches that can make my container directly receive ipv6 traffic without the translation.

I have tried directly run docker-proxy command with directly set option -container-ip to container ipv6 address, but not succeed.

2

Short answer: No, when using bridge it will translate ipv6 to ipv4, there is currently no “ipv6 only” in docker.
The only way to “fix” it, is to use network mode host