Echo EN55022 manual Examples, Protocol Selection, Source and Destination Ports

G.1.1 Examples

To pass any packet coming from the Class A 89.0.0.0 network you would enter:

SRC ADDR SRC MASK

89.0.0.0FF000000

The mask of FF00000 limits the comparison to the first 8 bits of the incoming address.

If a Class B address of 130.140 has a subnet with 8 bits to provide the network/subnet of 130.140.5, then to filter any packet from this subnet you would enter:

SRC ADDR	SRC MASK
130.140.5.0	FFFFFF00

If you wanted to filter a specific address on the Class B network/subnet with an address of 130.140.5.10 then you would enter:

SRC ADDR	SRC MASK
130.140.5.10	FFFFFFFF

For the equipment at address 130.140.5.10 to talk to any address on the network/subnet of 130.140.6.0 then you would enter:

SRC ADDR	SRC MASK	DEST ADDR	DEST MASK
130.140.5.10	FFFFFFFF	130.140.6.0	FFFFFF00

For the equipment at address 130.140.5.10 to talk to any network you would enter:

SRC ADDR	SRC MASK	DEST ADDR	DEST MASK
130.140.5.10	FFFFFFFF	ALL

G.2 PROTOCOL SELECTION

Protocols can be defined as TCP, UDP, ICMP or ALL

G.2.1 Examples

To stop all UDP traffic you would enter.

SRC ADDR	SRC MASK	DEST ADDR	DEST MASK	PROT	S.PRT	D.PRT	RSL
ALL	ALL			UDP	ALL	ALL	FAIL

In this case you would need a second line to pass other traffic.

SRC ADDR	SRC MASK	DEST ADDR	DEST MASK	PROT	S.PRT	D.PRT	RSL
ALL	ALL			UDP	ALL	ALL	PAS

G.3 Source and Destination Ports

Echo LANlink Router Option User Manual Issue 1.0 04 December 1997 Page 53 of 59