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#!/bin/bash
RULESET='add table ip filter
add chain ip filter filter { type filter hook prerouting priority mangle; policy accept; }
add ct helper ip filter ftp { type "ftp" protocol tcp; };
add rule ip filter filter tcp dport 33 ct helper set "ftp"'
set -e
$NFT -f - <<< "$RULESET"
RULESET='flush chain ip filter filter
delete chain filter filter
delete ct helper ip filter ftp'
$NFT -f - <<< "$RULESET"
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