Squid as default gateway in proxy mode.

[Muhammad Yousuf Khan <sirtcp@gmail.com>]

 i have lately installed SQUID proxy and to avail all the facilities i am using it as Proxy mod not as Transparent mode neither i wanted to. 

now the problem part is i want to ping outside host to verify the connectivity of internet for that all the time i have to open the SSH the console and ping. but what i want is, i should also ping it from host computers as well. however i don't want to NAT all the traffic coming from inside and going outside. rather what i want is just to NAT only ICMP Echo Rep and Req so that i can at least ping outside host with out SSH the Squid console. which is very bothering. 

My network diagram is very simple 


<Squid Box>--------eth0(192.18.30.2)----------------------<192.168.30.1-ISP Router>
       I
       I
   eth1(192.168.1.1)    
       I
       I
   (local network 192.168.1.0/24)


And why i am using Squid as a Gateway because i just want to minimize unwanted nods that needs to be monitor all the time and batter control over traffic with IPtables firewall. i am using this line to NAT very specific ports to allow certain facilities like Email , Remote desktop and stuff. and this is working for me.

iptables -t nat -A POSTROUTING -p TCP --dport 110 -j MASQUERADE

now i am stuck on allowing the ping traffic. please help


Thanks,