3Com 3CRWER101A-75, Руководство пользователя

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Firewall 65
Network attacks that deny access to a network device are called DoS
attacks. DoS attacks are aimed at devices and networks with a
connection to the Internet. Their goal is not to steal information, but to
disable a device or network so users no longer have access to network
resources.
The Router protects against DoS attacks including: Ping of Death (Ping
flood) attack, SYN flood attack, IP fragment attack (Teardrop Attack),
Brute-force attack, Land Attack, IP Spoofing attack, IP with zero length,
TCP null scan (Port Scan Attack), UDP port loopback, Snork Attack.
The firewall does not significantly affect system performance, so we
advise enabling the prevention features to protect your network.