Nlynx Wireless Gateway User Manual

Page 35

The LAN Interface settings control whether and how the Wireless Gateway

uses RIP with any routing devices networked to it through its LAN ports.

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The TX setting controls the transmission of routing information to

such devices. Possible settings are None (send no RIP packets), RIP-1

(send RIP version 1 packets), RIP-1 Compatibility (send RIP version

1 packets, but internally support RIP version 2 functions), and RIP-2

(send RIP version 2 packets).

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The RX setting controls the handling of routing information received

from such devices. Possible settings are None (ignore all RIP packets),

RIP-1 only (accept only RIP version 1 packets), RIP-2 only (accept

only RIP version 2 packets), and RIP-1/RIP-2 (accept both kinds of

packets).

The WAN Interface settings control whether and how the Wireless Gateway

uses RIP with any routing devices networked to it through its WAN port. The

available TX and RX settings are the same as those for the LAN interface, and

their effects are the same except that they control RIP use through the WAN

port.

NAT/Router Mode

NAT stands for Network Address Translation. NAT is ordinarily used when

only the WAN port has a “globally legal” IP address and machines on the

LAN all use “private addresses.” In NAT operation, the Wireless Gateway

modifies outgoing packets so their source IP address is that of the Wireless

Gateway's WAN port. All machines on the LAN thus appear to be a single

machine to outside devices. The Wireless Gateway also makes other necessary

modifications of each outgoing packet, so that return packets can be directed

to the correct machines on the LAN. Since all machines on the LAN appear to

have the same IP address to outside devices, NAT operation is also known as

“IP sharing.”

NAT mode must be used when the machines on the LAN all use private

addresses. It can also be used as a partial firewall when the machines on the

LAN use globally legal IP addresses but no routing devices other than the

Wireless Gateway exist on the LAN.

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