i get internet Over a LAN Connection by my ISP. As we r on LAN so i used to make

Full use of the FILE sharing etc with my Freinds who have the same Connection.

Recently (to Stop all this) my ISP installed a Hardware Firewall.(Its some Intelligent

Switch). I can still keep on sharing Files through FTP by changing Default Ports.

Not many Of the Ports r blocked other than Common Ones,

The most important thing in network is to PING a comp to see if it is Alive. now the

Ping is Blocked -- & i cant Live without it. Pls Help me out with it-- can i ping a

comp on some different Port other than the Default port (7 i think). If yes how can I

make some Remote machine listen My ping on some Different Port(*say 2121).
THX

Well ping uses ICMP echo requests and ICMP echo replies. It depends on how much your ISP has blocked. If they've only blocked ICMP type 0/code 0 and/or ICMP type 8/code 0, then you can try using ICMP type 13/code 0 and expect an ICMP type 14/code 0 as a response. Of course, this would require writing a new ping utility or finding a tool to do it for you (I believe nmap can do this).

You could also just try a TCP open on a specific port, in the case that all ICMP is blocked (you should get a TCP RST if you connect to a closed port, instead of an ICMP error if you used UDP).

Have you tried sending an arp request? That may suit your needs.