Gateway none - Manual (Page 58)

4-22
CHAPTER 4
4.3.7.1 Firewall Protection
The Gateway's firewall can block common hacker attacks,
including IP Spoofing, Land Attack, Ping of Death, IP with
zero length, Smurf Attack, UDP port loopback, Snork
Attack, TCP null scan, and TCP SYN flooding. The firewall
does not significantly affect system performance, so we
advise leaving it enabled to protect your network users.