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OfficeConnect Remote 812 Filtering Capabilities 6-47
Packet filters control inter-network data transmission by accepting or rejecting the
passage of specific packets through network interfaces based on packet header
information. When data packets are received by a network interface such as an
Ethernet LAN or WAN port, a packet filter analyzes packet header information
against a set of rules you define. A filter then lets the packet pass through or
discards it.
Filter Classes The OCR 812 supports three filter classes:
Input data - filter packets as they enter.
Output data - filter packets as they exit.
Embedded bypass for periodic router protocol packets (IP RIP, IPX RIP and IPX
SAP)
Each filter class can be identified further by the following types:
Filter Types Filters can be classified by the following types:
Data filters - based on protocol-specific packet information.
Advertisement filters - based on broadcast packet information (IP RIP, IPX RIP,
and IPX SAP).
Generic filters - based on packet structure.
Data Filters Data filters control network access based on the protocol, source / destination
address, and port designation (e.g., TCP and UDP port designations) of the packet.
The following table describes the data filters supported.
Advertisement Filters Advertisement filters operate on network protocol packets that contain varying
information such as SAP or RIP. Filtering of these packets is performed by the
specific protocol process.
The following table describes the advertisement filters supported:.
Table 6-3 Data Filters
Filter Action
IP Controls network access based on the protocol and source/destination address.
IP filter rules allow filtering based on the source address, destination address,
protocol type, source port, and port designation of the IP packet.
IPX Controls network access based on the protocol and source/destination network.
IPX filter rules allow filtering based on the source network, destination network,
protocol type, source socket, destination socket, source node, and node
designation of the IPX packet.
Bridge Controls network access based on the source and destination MAC addresses.
Table 0-1 Advertisement Filters
Filter Action
IP-RIP Controls the content of IP Routing Information Protocol (RIP) packets that are
sent out or received on specific ports. The IP RIP filtering process filters addresses
from the RIP packet upon transmission, and does not enter routes into the
routing table upon receipt.