TBH I haven’t played with passing caddy’s podman network to other containers, mine is a simple reverse proxy to other standalone containers but not directly connected via podman run --network (or quadlet network). In my scenario I can at least confirm that net.ipv4.ip_unprivileged_port_start doesn’t need to be modified, the only annoyance is that I cannot use a systemd user service, even though the end process doesn’t run as root.