[Podman] help setting up my rootless container

Hi everybody, I hope somebody can give me a hand, as I have looked around for many hours unsuccessfully already. I am setting up a number of rootless containers, each one run by its ad-hoc user, and some of those need to communicate between them. To do this, I am publishing their ports on a veth (10.255.255.1) and... I cannot get them to see each other. I have also tried with the --network=host parameter (assuming I would loose the network sandboxing then), to no luck. I am using podman 5.4 on debian trixie, in case that matters. Anybody has any idea on what might be wrong? Thank you for any help you can provide! -- Felix