
Inbound Traffic Filter Criteria and Actions
117348-A Rev. A 3-9
IP Criteria and Actions
You can filter IP inbound traffic based on specified bit patterns in one of the
following headers in an IP datagram:
• The IP header
• The header of the upper-level protocol (TCP or UDP, for example)
Predefined IP Criteria
Table 3-6 lists the predefined criteria for IP inbound traffic filters, and the
reference field, offset, and length for each criterion.
User-Defined IP Criteria
In addition to the predefined filter criteria, you can create IP inbound traffic filters
with user-defined criteria by specifying an offset and length to these reference
fields in the IP header:
a. Allows filtering on the ACK and RESET bits in the TCP header. You do not specify a range for this
criterion.
Table 3-6. Predefined Criteria for IP Inbound Traffic Filters
Criterion Name Reference Field Offset Length
Type of Service HEADER_START 8 8
Protocol ID HEADER_START 72 8
IP Source Address HEADER_START 96 32
IP Destination Address HEADER_START 128 32
UDP or TCP Source Port HEADER_END 0 16
UDP or TCP Destination Port HEADER_END 16 16
Established TCP
a
HEADER_END 107 3
Reference Field Description
HEADER_START Points to the first byte of the Type of Service
HEADER_END Points to the last byte of the IP Destination Address
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