Configuring Custom Signatures - ZyXEL Communications ZyWall USG 2000 User Manual

Unified security gateway

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Table of Contents

Chapter 31 IDP

Table 151 IP v4 Packet Headers (continued)

Header Checksum

Source IP Address

Destination IP

31.8 Configuring Custom Signatures

Select Anti-X > IDP > Custom Signatures. The first screen shows a summary

of all custom signatures created. Click the SID or Name heading to sort. Click the

Add icon to create a new signature or click the Edit icon to edit an existing

signature. You can also delete custom signatures here or save them to your

This is used to detect processing errors introduced into the

packet inside a router or bridge where the packet is not

protected by a link layer cyclic redundancy check. Packets

with an invalid checksum are discarded by all nodes in an

This is the IP address of the original sender of the packet.

This is the IP address of the final destination of the

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.

Padding is used as a filler to ensure that the IP packet is a

multiple of 32 bits.

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