Blocking request to port 80 on gateway on Ubuntu

Question

I want to block access to the gateway (192.168.1.1) on port 80, to prevent network user from trying to access the router setup. I'm using Ubuntu 9.10

Answer 1

iptables -A INPUT -j DROP -p tcp --to-destination 192.168.1.1:80 -i eth0

Change --to-destination 192.168.1.1:80 to the IP address of the gateway.

Change -i eth0 to the interface that you need the rule on.

Note that this will completely block all access to that IP/port combination unless you create a specific rule to allow traffic from one IP, like perhaps an administrative workstation.