Lucent Technologies 6000 - Manual (Page 537)

MAX 6000/3000 Network Configuration Guide 15-1
15 Defining Static Filters
Filter overview
A filter consists of specifications describing packets and actions to take upon packets that
match the descriptions. After you apply a filter to an interface, the MAX unit monitors the data
stream on that interface.
Depending on how you define a filter, it can apply to inbound packets, outbound packets, or
both. In addition, filters are flexible enough to specify taking an action (such as forward or
drop) on those packets that match the specifications, or on all packets except those that match
the specifications.
Basic types of filters
Each Filter profile contains up to 12 input filters (applied to inbound packets) and 12 output
filters (applied to outbound packets). Each of the up to 24 specifications can be one of the
following basic types of filters:
• Generic filters
• IP filters
• Type of Service filters
• IPX filters
Generic filters examine the byte- or bit-level contents of any packet, comparing specified or
bits with a value defined in the filter. On the basis of this comparison, the filter specifies a
forwarding action. They specify a forwarding action based on a comparison between certain
bytes or bits in a packet and a value defined in the filter. To use generic filters effectively, you
need to know the contents of certain bytes in the packets you wish to filter. Protocol
specifications are usually the best source of such information.
Filter overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-1
Defining generic filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-7
Defining IP filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-11
Defining Type of Service filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-18
Defining IPX filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-22
Applying a filter to an interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-25