On Wed, Apr 29, 2020 at 11:36:13AM +0200, Norbert van Bolhuis wrote: [...] > I guess it's some kind of openwrt nf_tables (module) build/incompatibility problem!? Your lsmod listing does not show nft_chain_nat, this module should autoload when you invoke: add chain nat prerouting { type nat hook prerouting priority 0 ; } Did you try modinfo / modprobe nft_chain_nat manually to check if you can reach this module?