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Echo LANlink Router Option User Manual

Issue 1.0

04 December 1997 Page 38 of 59

SRC MASK

The  IP  mask  associated  with  the
Source Address in hexadecimal
format.  Left blank if ALL source
addresses are forwarded.

DEST ADDR

The destination address of IP packets
to be filtered.  A network address,
individual IP address or ALL may be
specified.

DEST MASK

The  IP  mask  associated  with  the
Destination Address in hexadecimal
format.  Left blank if ALL destination
addresses are specified.

PROT

Indicated the protocol this entry will
filter on e.g. ANY, TCP ONLY, UDP
ONLY, ICMP ONLY

S.PRT

The Source Port that this entry will
Filter on.

D.PRT

The Destination Port that this entry
will filter on.

RSLT

SAP (Service Advertising Protocol) is used on Novell™ networks to inform
workstations and file servers of what services the network can offer.  The IPX
SAP filter only operates when the IPX mode is set to route.

The Router maintains an internal table of known services.  It receives SAP
updates on either port and broadcasts the information to the other port.  The
filter allows selected information to be ignored on receipt and hence not
stored in the SAP filter table.  If a SAP update is not in the table it will be
dropped and propagated to the other port.

A filter table is available for each port.  Each table has 16 entries and is
searched sequentially until a match is found.  Each line can be set to pass or
fail.

A SAP entry contains six elements, but the filter can only act on the following
three; Service TYPE, Socket Address (FROM SKT, TO SKT) and SERVER
NAME.

The following fields are ignored:

Network Address (32 bits)