{
    # Activate the new chain and destroy the old.
    $OUT .=<<'EOF';
    /sbin/iptables --replace ForwardedUDP 1 \
        --jump $NEW_ForwardedUDP
    /sbin/iptables --flush $OLD_ForwardedUDP
    /sbin/iptables --delete-chain $OLD_ForwardedUDP
EOF
}
