hi myself vicky,
in my office i have to block all messenger like yahoo messenger, windows live messenger, i have to block websites like
www.yahoo.com, some more web sites. i need guidance through which i can accomplish this task
through ip tables or through squid server. i can use squid but i had heard that squid blocks pop and smtp also. squid creates some problem in receiving and sending email.
i am using red hat linux 4 box and installed squid having two ethernet card 1 is connected to adsl line and 2 is connected to switch. all clients will have proxy address of this linux box. guys need ur help ASAP.