RAD Data comm Modular Access Device with Integrated Router Manuel D’Utilisation

FCD-IPM Installation and Operation Manual 

Chapter 5  Setup Menu 

 

WAN Economy Menu 

5-89 

Low Level (IP 

protocol) 

Toggle to the required low level protocol for the filter. If 

the port number is defined in decimal format, specify the 
low level protocol as UTP or TCP. If no port number is 

defined, specify the low level protocol as UTP, TCP, or 

. Choose True or False. 

Low Level (IPX 

protocol) 

Toggle to the required low level protocol for the filter. If a 

socket is defined in the destination address, a low level 

protocol or socket number may not be specified. 
Conversely, if a socket address or low level is not defined, 

a socket number may be specified. 

Mask 

A mask is a test pattern that is used to allow certain frame 
patterns only. You define a code against which the frame 

is compared. 
To create a mask, toggle to Yes. Three pairs of codes and 
offsets must be created. The offset defines the point in the 

frame at which the comparison is made.  
For example, an offset of 8 means that the 8

th

 byte is 

compared to the code. The offset can be from the 7

th

 byte 

onwards.  
The frame is made of 3 different portions: 

 - is at the beginning of the frame 

 - is after the source address in the frame 

 - is after the LLC section in the frame. 

For each code-offset pair, select the code format: 
Binary

 - specify 48 address bits to be either 0,1, or X 

(unspecified) 

 - specify 12 hex digits to be 0-F or X 

(unspecified). 

For each code-offset pair, choose True or False.  

Every frame, at the designated offsets, is compared to the 

three codes in the mask. If all three codes and the 
True-False condition match the code written in the frame, 

the frame passes. 

Note: Only one mask can be defined. 

Status 

The filter is in use. 
Allows you to define filters which can be stored and used 

at a later time. 

 
Saving Filter Parameters 
All filters are stored in the Flash Memory, thereby preserving them if the power 
goes down. When filtering is selected, all of the filters are copied into the RAM. 
The RAM copy is then used to activate the software filtering process. Any filter 

which is modified, (by clearing all, deleting one, or changing a parameter) goes 
into effect immediately. The previous filter also remains in effect until the system is 
rebooted.