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Chapter 4: Configuration
55
Intrusion Detection
The router’s Intrusion Detection System (IDS) is used to detect hacker attacks and intrusion attempts from the
Internet. If the IDS function of the firewall is enabled, inbound packets are filtered and blocked depending on
whether they are detected as possible hacker attacks, intrusion attempts or other connections that the router
determines to be suspicious.
Blacklist: If the router detects a possible attack, the source IP or destination IP address will be added to the
Blacklist. Any further attempts using this IP address will be blocked for the time period specified as the Block
Duration. The default setting for this function is false (disabled). Some attack types are denied immediately without
using the Blacklist function, such as Land attack and Echo/CharGen scan.
Intrusion Detection: If enabled, IDS will block Smurf attack attempts. Default is false.
Block Duration:
Victim Protection Block Duration: This is the duration for blocking Smurf attacks. Default value is 600
seconds.
Scan Attack Block Duration: This is the duration for blocking hosts that attempt a possible Scan attack.
Scan attack types include X’mas scan, IMAP SYN/FIN scan and similar attempts. Default value is 86400
seconds.
DoS Attack Block Duration: This is the duration for blocking hosts that attempt a possible Denial of
Service (DoS) attack. Possible DoS attacks this attempts to block include Ascend Kill and WinNuke. Default
value is 1800 seconds.