PLANET SG-500 - Manual (Page 266)

SG-500 VPN Security Gateway User’s Manual
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7.1 Settings
Sasser Block
„ Can block the external Sasser virus attack.
MSBlaster Block
„ Can block the external MSBlaster virus attack.
Code Red Block
„ Can block the external Code Red virus attack.
Nimda Block
„ Can block the external Nimda virus attack.
Detect SYN Attack
„ Can detect the disconnection situation as the hacker keeps sending the TCP SYN data packets
to paralyze the server connection.
‹ SYN Flood Threshold (Total)：Define all the IP and the total SYN packets（Pkts/Sec）
pass through the SG-500. If over the setting value, then SG-500 will define it to be
attacked.。
‹ SYN Flood Threshold ( Per Source IP )：Define every source IP and the total SYN
packets（Pkts/Sec） pass through the SG-500. If over the setting value, then SG-500 will
define it to be attacked.。
‹ SYN Flood Threshold Blocking Time (Per Source IP )：The SG-500 will block the
packets from the attack source IP according to the time setting. After the blocking time,
the SG-500 will re calculate the total SYN flow from every source IP, if over the setting
value, then SG-500 will keep blocking.