Public bug reported:
Ubuntu 24.04.3 behaves weirdly when it comes to "nat" iptables rules -
it completely ignores any of them (and "prerouting" in particular). It
won't log any packets or connections from "nat" either with "-j LOG".
Other distros (tested on fedora workstation 43) work as expected
Steps to reproduce:
1) Create two virtualbox (my case - 7.2.4, Windows 11 host) VMs, connect an
additional host-only adapter to both
2) Boot one to ubuntu 24.04.3 live cd, another - to fedora workstation 43
(installation can be omitted - works in live mode too)
3) Check local IPs of adapters
4) Use "sudo iptables -t nat -A PREROUTING -j LOG"
5) Start "nc -l 1111" on guests, "ncat 192.168.56.<guest ip> 1111" on host,
send some messages (guests receive them as expected), close connection
6) Check "sudo dmesg" on both guests
Expected behaviour: iptables log message in both kernel logs
Real behaviour: only fedora's log has an iptables message ("IN=enp8s0 OUT=
MAC=...")
Fully installing ubuntu and performing "apt dist-upgrade" does not fix
the issue
** Affects: iptables (Ubuntu)
Importance: Undecided
Status: New
** Tags: iptables nat netfilter network
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https://bugs.launchpad.net/bugs/2138241
Title:
Iptables "nat" table rules are ignored on 24.04
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