3Com 3C840 manual Creating Filters Overview, Traffic, Bridge filter in this example, Packet

12-4CHAPTER 12: CONFIGURING FILTERS

Creating generic filters can be a complex task. Only experienced users should employ generic filters, and strictly in cases where data and advertising filters cannot provide the filtering capabilities that you require.

Creating Filters Overview

Filters can be set one of two ways in the OfficeConnect Remote 840:

■Using Command Line Interface (CLI). (See Appendix D for instructions to access the CLI.)

■Using the OfficeConnect Remote 840 Manager.

The more flexible way of setting filters is through the Command Line Interface (CLI). Both data and advertisement filters can be set using CLI.

For more information on accessing CLI, refer to the OfficeConnect Remote 840 SDSL Router CLI User's Guide.

If you want to set up filters using the OfficeConnect Remote 840 Manager, go to the “Step-by-Step Guide to Creating Filters Using the OfficeConnect Remote 840 Manager”section.

Creating Filters	The OfficeConnect Remote 840 Manager supports data filters only (not
Using the	advertisement filters). Data filters are used to remove packets from the
OfficeConnect	normal flow of data traffic. They can be applied to IP, IPX, and/or Bridge
Remote 840	traffic.
Manager	Filters affect only those protocols which are currently active in the
	OfficeConnect Remote 840.
	Therefore, if the unit is set up to Bridge only, only bridge filters have an
	effect on the data traffic; IP and IPX filters have no effect even if IP or IPX
	traffic is being bridged. Internally (for greater efficiency), filters are
	examined when a data packet is being processed by the protocol, not as
	the packet enters or exits the unit (even though when filters are set up, it
	looks like they take effect at the interface level). For example, when IPX
	traffic is bridged, it is processed by the bridge protocol in the unit, not by
	the IPX protocol. Therefore, a filter on IPX traffic would have to be a
	bridge filter in this example.
	There are two sets of criteria used in determining whether a filter affects
	a packet.