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.
Max TCP Open Handshaking Count: This is a threshold value to decide whether a SYN Flood attempt is
occurring or not. Default value is 100 TCP SYN per seconds.
Max PING Count: This is a threshold value to decide whether an ICMP Echo Storm is occurring or not. Default
value is 15 ICMP Echo Requests (PING) per second.
Max ICMP Count: This is a threshold to decide whether an ICMP flood is occurring or not. Default value is 100
ICMP packets per seconds except ICMP Echo Requests (PING).
For SYN Flood, ICMP Echo Storm and ICMP flood, IDS will just warn the user in the Event Log. It cannot
protect against such attacks.
(60 Seiten)
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