Perle Systems P840 User Manual download pdf (Page 54)

Filtering

IP Router Pattern Filtering

Pattern filtering may be used on any portion of the IP frame. IP pattern filtering behaves the same as bridge pattern filtering,

except the start of the IP frame is offset 0, because the IP router function of the bridge/router handles only the IP frame

itself.

IP pattern filtering may use any combination of filtering operators as described in the bridge pattern filters.

Protocol Discrimination

Protocol discrimination may be required to prevent or limit the protocols within an IP frame that may traverse a routed Local

Area Network.

In Local Area Networks, there may be many different Transport layer protocols that coexist within the IP Network layer.

TCP, UDP, and ICMP are just a few of the common protocols in use today. Each of these protocols is encapsulated within

an IP frame, and therefore is subject to the IP routing function. If you would like to discriminate against a particular protocol

to prevent its usage of the routed LAN facilities the P840 router provides programmable filter masks that may be defined to

act on any part of the IP frame.

The IP Router Filter Patterns menu is located under the Filter Set-Up Menu. Within the IP Router Filter Patterns Menu there

exists a Help function that can be used as a reference during IP Router Filter Pattern creation. This Help function includes all

of the logical operators that may be applied to the mask expression.

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Perle Systems P840 User Manual Page 54