WWW caching service by default listen on TCP 8080 port. Following iptables rules allows WEBCACHE incoming client request (open TCP port 8080) for server IP address 202.54.1.20:
iptables -A INPUT -p tcp -s 0/0 –sport 1024:65535 -d 202.54.1.20 –dport 8080 -m state –state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -p tcp -s 202.54.1.20 –sport 8080 -d 0/0 –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT