OpenWRT 24.10: Can firewall3 (fw3) Still Be Used Instead of firewall4 (fw4)?

For Developers
1

Hi,

We are migrating our product to Linux kernel 6.6 and OpenWRT 24.10. Currently, our firewall-related functionalities are based on firewall3 (fw3).

  • In OpenWRT 24.10, is it mandatory to use firewall4 (fw4), or is it still possible to use firewall3 (fw3)?
  • If fw3 is still usable, are there any known limitations, compatibility issues, or required modifications?

Thank you.
Regards,
Naveen kumar A

2

Yes, but owut will replace it with firewall4.
I can assist converting iptables ruless to nftables if that is holding you back.

3

Thanks for your feedback

May I know , w/o converting to nftables rules , can I enable fw3 package and use existing iptables rules in openWRT 24.10?

4

Yes, you can use iptables rules.
Just that cloud upgrades will substitute fw3 to fw4, you have to sysupgrade to images via firmware-selector or local builder, not attended/owut/auc upgrades.
By large no change since v22

Dictionary here
https://wiki.nftables.org/wiki-nftables/index.php/Supported_features_compared_to_xtables