ZyXEL ZyWALL USG 2000 User Guide - Page 587
Configuration > Anti-X > IDP > Custom Signatures > Add/Edit continued
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Chapter 34 IDP Table 159 Configuration > Anti-X > IDP > Custom Signatures > Add/Edit (continued) LABEL DESCRIPTION Fragmentation A fragmentation flag identifies whether the IP datagram should be fragmented, not fragmented or is a reserved bit. Some intrusions can be identified by this flag. Select the check box and then select the flag that the intrusion uses. Fragmentation Offset When an IP datagram is fragmented, it is reassembled at the final destination. The fragmentation offset identifies where the fragment belongs in a set of fragments. Some intrusions use an invalid Fragmentation Offset number. Select the check box, select Equal, Smaller or Greater and then type in a number Time to Live Time to Live is a counter that decrements every time it passes through a router. When it reaches zero, the datagram is discarded. Usually it's used to set an upper limit on the number of routers a datagram can pass through. Some intrusions can be identified by the number in this field. Select the check box, select Equal, Smaller or Greater and then type in a number. IP Options IP options is a variable-length list of IP options for a datagram that define IP Security Option, IP Stream Identifier, (security and handling restrictions for the military), Record Route (have each router record its IP address), Loose Source Routing (specifies a list of IP addresses that must be traversed by the datagram), Strict Source Routing (specifies a list of IP addresses that must ONLY be traversed by the datagram), Timestamp (have each router record its IP address and time), End of IP List and No IP Options. IP Options can help identify some intrusions. Select the check box, then select an item from the list box that the intrusion uses Same IP Select the check box for the signature to check for packets that have the same source and destination IP addresses. Transport Protocol The following fields vary depending on whether you choose TCP, UDP or ICMP. Transport Protocol: TCP Port Select the check box and then enter the source and destination TCP port numbers that will trigger this signature. ZyWALL USG 2000 User's Guide 587
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