Lucent Technologies 6000 Manuale Utente

MAX 6000/3000 Network Configuration Guide

 15-7

Generic filters can match any packet, regardless of its protocol type or header fields. The filter 
specifications operate together to define a location in a packet and a hexadecimal value to 
compare to it. 

In a local Filter profile, a generic filter uses the following parameters (shown with their default 
values):

Input filters...

In filter NN

Generic...

Offset=0

Length=0

Mask= 00:00:00:00:00:00:00:00:00:00:00:00

Value=00:00:00:00:00:00:00:00:00:00:00:00

Compare=No

More=No

The same parameters are also available in the Output Filters subprofile. If you set the 
parameters in an input filter, only inbound packets are examined. If you set them in an output 
filter, only outbound packets are examined.

Offset

Byte-offset at which to start comparing packet contents to the 
Value setting specified in the filter. For details, see “Specifying the 
offset to the bytes to be examined” on page 15-9.

Length

Number of bytes to test in a packet, starting with the byte at the 
specified Offset parameter. For details, see “Specifying the 
number of bytes to test” on page 15-9.

Mask

A binary mask.The system applies the Mask to the value specified 
by the Value parameter before comparing it to the bytes in a packet 
specified by the Offset parameter. For details, see “Masking the 
value before comparison” on page 15-10.

Value

A hexadecimal number to be compared to the packet data 
identified by the Offset, Length, and Mask calculations. After you 
have entered the number, the system enters a colon at the byte 
boundaries.

Compare

Type of comparison to perform. If Compare is set to Yes, the 
comparison succeeds (the filter matches) if the contents do not 
equal the specified value. For a filter that requires the packet 
contents to equal the specified value, leave Compare set to No.