Re: [squid-users] Can i block ping with squid?

[Chris Robertson]

Maoz wrote:
on iptables
iptables -A INPUT -p icmp -j DROP
  

Which is just a HORRID idea.  If you want to block ping, block ping 
requests...

iptables -A INPUT -p icmp --icmp-type 8 -j DROP

...but for the LOVE OF THE INTERNET don't block destination-unreachable, 
source quench or time-exceeded messages. (icmp-type 3, 4 and 12 
respectively).  For your own troubleshooting, allow echo replies 
(icmp-type 0) as well.

Chris