Unfortunately, I cannot confirm this on a freshly installed Ubuntu 20.04 VM (that I grabbed with https://github.com/canonical/multipass on my laptop running debian/bullseye).
I've replicated the registry example with the registry like this: ubuntu@accessible-liger:~$ podman run -d -p 5000:5000 --name registry docker.io/registry:2 40c86041d629bec154a29eadb00440cf5fa43d7acbd8e4ca5e1fc90dabd1a3ec ubuntu@accessible-liger:~$ curl -s localhost:5000/v2/ | jq {} As for your network connectity issue: root@accessible-liger:~# podman run --rm -it debian Resolved "debian" as an alias (/etc/containers/registries.conf.d/shortnames.conf) Trying to pull docker.io/library/debian:latest... Getting image source signatures Copying blob bd8f6a7501cc done Copying config 0d587dfbc4 done Writing manifest to image destination Storing signatures root@db1fb5ce9bf4:/# apt update Get:1 http://security.debian.org/debian-security buster/updates InRelease [65.4 kB] Get:2 http://deb.debian.org/debian buster InRelease [121 kB] Get:3 http://security.debian.org/debian-security buster/updates/main amd64 Packages [272 kB] Get:4 http://deb.debian.org/debian buster-updates InRelease [51.9 kB] Get:5 http://deb.debian.org/debian buster/main amd64 Packages [7907 kB] I've tested both use-cases both in rootful and in rootless mode, both worked fine for me. ** Changed in: libpod (Ubuntu) Status: New => Incomplete ** Changed in: libpod (Ubuntu) Assignee: (unassigned) => Reinhard Tartler (siretart) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1925765 Title: [21.04 regression] networking broken in containers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libpod/+bug/1925765/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs