Hacking Linux Exposed

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# if using ipchains
/sbin/ipchains -A -p udp -s 192.168.1.50 --destination-port 177 -j ACCEPT
/sbin/ipchains -A -p tcp -s 192.168.1.50 --destination-port 177 -j ACCEPT
/sbin/ipchains -A -p udp --destination-port 177 -j DENY
/sbin/ipchains -A -p tcp --destination-port 177 -j DENY

# Or if using Netfilter:
/sbin/iptables -A -p udp -s 192.168.1.50 --destination-port 177 -j ACCEPT
/sbin/iptables -A -p tcp -s 192.168.1.50 --destination-port 177 -j ACCEPT
/sbin/iptables -A -p udp --destination-port 177 -j DROP
/sbin/iptables -A -p tcp --destination-port 177 -j DROP