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Description of problem:
podman cannot create a rootless container that attempts to publish ports from a IPv6 address.

Version-Release number of selected component (if applicable):
Rhel 8.4 Ootpa with podman 3.0.1-7.module+el8.4.0+11311+9da8acfb
slirp4netns-1.1.8-1.module+el8.4.0+11311+9da8acfb.x86_64

How reproducible:
Just use podman create to create a rootless container that attempts to publish ports from a IPv6 address, then try to start it.

Steps to Reproduce:

$podman create --name test -p [2610:130:108:81::a5a:533]:6667:6667 alpine:latest sleep 30

$podman start <container ID>

Actual results:

Error: unable to start container "xxxxx": rootlessport listen tcp: address 2610:130:108:81::a5a:533:6667: too many colons in address

Expected results:
container should start

Additional info:

Found these on upstream
https://gitlab.freedesktop.org/slirp/libslirp/-/merge_requests/62
https://gitlab.freedesktop.org/slirp/libslirp/-/merge_requests/75

Matt,

IPV6 isn't supported in Podman yet right?  I think we're still sitting on https://github.com/containers/podman/issues/6114 and perhaps others.

We are presently in a limited support state. We support creating networks using IPv6 subnets and creating containers in those networks that will receive IPv6 addresses and be capable of full v6 connectivity. We do not support static IPv6 addresses and port forwarding with v6 addresses yet (both are slated to be part of the network rewrite). This (rootless v6 port forwarding) is not slated to be part of the rewrite - the required fix is outside of Podman, in rootlesskit - but it should not be a large change.

Hello Matthew,

I understand that rootless v6 port forwarding is not slated to be part of the rewrite. User is requesting for this feature. Would it be possible to implement this in future releases. If yes, we will raise an RFE for this.

Yes, it is definitely possible.

We've been doing further testing on this in preparation for the Podman v4.0 release, and we've discovered that it is already working in Podman v3.4, as shipped in RHEL 8.5.0.2; as such I'm going to CURRENTRELEASE this.