"Rodolfo J. Paiz" <[EMAIL PROTECTED]> writes:
> At 3/30/01 08:30 PM -0600, you wrote:
> >That triggers a question in me... Which port does ping use? Port 7?
>
> Ping is an ICMP protocol service. ICMP does not use ports.
The FAQ from comp.os.linux.security has some information about this:
http://www.linuxsecurity.com/docs/colsfaq.html
Be sure to read the pros and cons section, right below this. It may
not be advisable to do that:
NOTE: -hp Notice that it take a pair of rules:
Ping requests are called echo requests, or ICMP type 8, and
incoming pings can be disabled with IPchains using the
following command:
/sbin/ipchains -I input -j DENY -p icmp -s 0.0.0.0/0 echo-request
-d $EXTERNALIP
/sbin/ipchains -I output -j DENY -p icmp -s $EXTERNALIP
echo-reply -d 0.0.0.0/0
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