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Echo EN55022 Network Router User Manual

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

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

89.0.0.0 FF000000

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

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