slackware linux , block LAN on all port ,except port 80 ?

my Lan is . how to block this LAN from accessing my slackware server on all port except port 80 only? I don't want to shut down other linux service like ssh because my other LAN is using it.

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You can do this in iptables with some rules:

iptables -A INPUT -s -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -s -m state --state NEW -j DROP

for more info on iptables rules see

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Gabriel OrozcoSolution ArchitectCommented:
another form

iptables -P INPUT DROP
iptables -A INPUT -s -p tcp --dport 80 -j ACCEPT
iptables -A INPUT  -m state --state ESTABLISHED,RELATED -j ACCEPT

this way you accept only port 80 and related connections.
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