Tut Systems XL-12000S IP Routing Only, Routing Example One Using a Router and Bridge Combination

XL-12000S

MANAGED, HIGH-SPEED NETWORK MODEM USER GUIDE

2. IP Routing Only

This selection will route IP traffic between different networks. In “IP Routing Only” mode, the modem passes only IP packets between networks attached to the LAN and DSL sides of the modem, and networks designated in the modems static routing tables. This option will block all non-IP traffic. “Appendix D” provides subnet mask information.

You must also modify or configure the routing table of your external gateway router to include the network changes made when the modems are incorporated as routers. Operators are urged to consult their router vendor’s documentation to configure the routing table for their external gateway router.

Routing Example One (Using a Router and Bridge Combination):

This example shows how to use one XL-12000S as a router and another as a bridge. Using this configuration saves IP addresses but increases traffic (i.e. broadcast packets from the bridged LAN) on the DSL line.

Figure 7.4 Routing Example One (Using a Router and Bridge Combination)

Building 1	Building 2
Ethernet Hub
	192.168.3.3
192.168.2.2 (LAN)
	192.168.3.2 (LAN)
192.168.3.1
(DSL)
TUT SYSTEMS	TUT SYSTEMS
Modem 1	Modem 2

20 TUT SYSTEMS 7.0 CONFIGURE THE MODEM

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