3Com 2200 manual Address

A-10 APPENDIX A: PACKET FILTER OPCODES, EXAMPLES, AND SYNTAX ERRORS

Type Filter This filter operates on the type field of a frame. It allows packets to be forwarded that are IP frames. To customize this filter to another type value, change the literal value loaded in the pushLiteral.w instruction.

name	“Forward	IP frames”
pushField.w	12	#	Get type		field
pushLiteral.w	0x0800	#	Load	IP	type value
eq		#	Check	for match

Ethernet Type IPX This filter rejects frames that have either a Novell IPX Ethernet type field and Multicast Filter (8134 hex) or a multicast destination address.

name	“Type > 900	or	Multicast”
pushField.w	12	#	Get	type field
pushLiteral.w	0x900	#	Push type value to test
		#	against
gt		#	Is type field > 900 (hex)?
reject		#	If yes: reject frame (done)
pushLiteral.b	0x01	#	Multicast bit is low-order bit
pushField.b	0	#	Get 1st byte of destination
and		#	Isolate multicast bit
not		#	Top	of stack 1 to accept,
		#	0 to	reject

Multiple This filter operates on the destination address field of a frame. It allows Destination packets to be forwarded that are destined for one of four different stations.

Address Filter To customize this filter to other destination stations, change the literal values.

name	“Forward	to four	stations”
pushField.a	0	#	Get destination address
pushTop		#	Make	3 copies		of	address
pushTop		#
pushTop		#
pushLiteral.a	0x367002010203 #		Load	allowed		destination
		#	address
eq		#	Check	for	match
accept		#	Forward if		valid		address
pushLiteral.a	0x468462236526 #		Load	allowed		destination
		#	address
eq		#	Check	for	match
accept		#	Forward if		valid		address
pushLiteral.a	0x347872927352 #		Load	allowed		destination
		#	address
eq		#	Check	for	match
accept		#	Forward if		valid		address
pushLiteral.a	0x080239572897 #		Load	allowed		destination
		#	address
eq		#	Check	for	match