User guide

246 Chapter 5. Command Line Interface Reference
Bridge Filtering Commands (FILTER BR)
Bridge filtering allows you to control the packets transferred across the router. This feature can be used to enhance
security or improve performance. Filtering is based on matched patterns within the packet at a specified offset.
Two filtering modes are available.
¥ Deny mode will discard any packet that matches the deny filter database and let all other packets pass.
¥ Allow mode will only pass the packets that match the allow filter database and discard all others.
Up to 40 deny and 40 allow filters can be activated from the filter database.
FILTER BR ?
Lists the supported keywords.
FILTER BR ADD
Adds a bridging filter to the filtering database.
FILTER BR DEL
Deletes a bridging filter from the filtering database.
filter br ?
Response:
Bridge filter commands:
? add del
use list
filter br add [pos] [data] allow | deny
pos Byte offset within a packet; number from 0-127.
data Hexadecimal number up to 6 bytes.
Example: filter br add 12 8035 deny
(This Þlter prevents forwarding of RARP packets across the bridge)
filter br del [pos] [data] allow | deny
pos Byte offset within a packet; number from 0-127.
data Hexadecimal number up to 6 bytes.
Example:
filter br del 12 8035 deny