Advertisement Filters; Generic Filters - 3Com 3C840 User Manual

Advertisement Filters

Generic Filters

Table 12–1 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.
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 12–2 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.
IPX-SAP Controls the content of Service Advertising Protocol (SAP) packets that
are sent out or received on specific ports. The IPX-SAP filter rules allow
filtering on service type, server name, network address, node address,
and socket number fields of the service entry. The forwarding process
uses the filter information to prevent the service information from being
included in the SAP packet.
IPX-RIP Controls the content IPX RIP packets that are sent out or received on
specific ports. The IPX RIP filtering process filters addresses from the RIP
packet upon transmission, and does not enter routes into the routing
table upon receipt.
Generic filters are protocol-independent and are specified by byte and
offset values in a packet. Packets are filtered by comparing each packet's
offset value and byte information with the values that you define in the
filter. The router will accept or reject the packet based on the result.
Filtering Capabilities 12-3