AlphaShield Professional Hardware Firewall
 

How does it fare on the security scale? AlphaShield claims a 100% guarantee,
one of those boasts immunity to DoS (Denial of Service) attacks. While I
cannot simulate a DoS attack for this review, most DoS attacks are designed to
bring a network to its knees by flooding it with useless traffic. Attacks such
as the Ping of Death and Teardrop also exploit limitations in TCP/IP
protocols. AlphaShield does provide links to other security web pages to
conduct your own tests.