At 11/21/2001 08:40 AM -0500, you wrote:
>Is it possible to disable all ports except for a few from a specific IP 
>address?
>
>For example, if I have one machine(or IP address) in my network that I 
>want to disable everything but port 80 and 443, but for the other machines 
>leave everything open. Being a somewhat hypothetical situation please 
>don't ask why you'd want to do such a thing....

ipchains -A input -i <out_if> -p tcp -s <remote_ip> 1024:65535 -d 
<local_ip>  80 -j ACCEPT
ipchains -A input -i <out_if> -p tcp -s <remote_ip> 1024:65535 -d 
<local_ip> 443 -j ACCEPT
ipchains -A input -i <out_if> -p tcp -s <remote_ip> 1024:65535 -d 
<local_ip>     -j REJECT

ipchains -A output -i <out_if> -p tcp ! -y -s <local_ip> -d <remote_ip> 
1024:65535 -j REJECT

Allow the two ports, then reject anything else.


--
Rodolfo J. Paiz
[EMAIL PROTECTED]



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