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This site, is devoted to the extreme computer security needed in todays world of cybercrime. Many of us think we are secure and most of us are not. Please email ideas or tips to admin@computersecurity.cc.

Ping

Many hackers ping your IP address to see how the computer reacts.  You should turn off pinging in your firewall or router.  Some people say you should turn off broadcast filtering (same thing).

Routers should also be configured to drop packets that don’t have a legitimate IP address.  This is to protect against IP spoofing. Routers should also drop packets that originate from these IP addresses 255.255.255.255/32, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0./16, 240.0.0.0/5, 224.0.0.0/4, 248.0.0.0/5, 0.0.0.0/8, 127.0.0.0/8, 169.254.0.0/16.  These IP addresses are from untrusted sources like private networks and unallocated IP addresses.