Hi, everybody. This is my first message here and i hope you can help me. I have a Linux Box as a Gateway of my network. And i want do allow internal machines to ping the Internet but i also want to block external machines to ping my Gateway. Is this is possible plz send me something... Thanx. ---------------------- Hélio Dubeux Neto _________________________________________________________________ MSN Hotmail, o maior webmail do Brasil. http://www.hotmail.com