this post was submitted on 16 Jan 2025
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Hi,

On my Debian 12 Bookworm ( raspberry pi )

My nftables do not block DHCP packets ! according to this basic rules

nft -y list rulesset

table ip Tip {

	chain chIN {
		type filter hook input priority 0; policy drop;
		ct state established,related accept
	}
	chain chFW {
		type filter hook forward priority 0; policy drop;
	}
	chain chOUT {
		type filter hook output priority 0; policy drop;
		udp dport 67 drop #DHCP
		udp dport 53 accept
		tcp dport { 80, 443} accept
		ct state established,related accept
	}

}

DHCP should be blocked... but it's not as I get an IP from it..

Any ideas ?

Thanks.

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[–] SpongeB0B@programming.dev 1 points 2 weeks ago

Obviously, but I'm anyway wondering why it doesn't blocking like it should
I hope nftables do not let other pass like this...