IP Routing 6-5

A forwarding table is maintained which specifies which interface to route an IP packet based on the destination IP address. Entries in the forwarding table are both static and dynamic. Static entries are based on the LAN’s and remote site's subnet addresses and user configured static routes. Dynamic entries are added when RIP is enabled and routes are learned from neighboring routers.

To configure IP routing, IP must be defined on both the LAN interface and one or more VC profiles. On the LAN, an IP network must exist with a specified IP address and subnet mask. In the VC profile, IP routing needs to be enabled, and the remote router address, a remote subnet mask and local WAN interface address need to be configured. The remote site address configuration can be learned dynamically when the connection is established if the Network Service is PPP, otherwise it has to be specified.

Remember to save your configuration using the save all command before rebooting your OfficeConnect Remote 812 so that your changes will be written to permanent FLASH memory.

Enabling IP Routing When the OfficeConnect Remote 812 is to be used for IP Routing, IP forwarding must be enabled. This is a global setting for the entire router.

To enable IP routing, use the command:

￿enable ip forwarding

To disable IP routing, use the command:

disable ip forwarding

IP Forwarding refers to the routing of IP packets from one interface to another. It does not affect communicating to the OfficeConnect Remote 812 itself. Even when IP Forwarding is disabled, you can perform non-routing functions such as use a Web browser to manage the unit and use PING.

In addition to IP forwarding, there is a global RIP setting. If RIP is globally disabled, it is disabled for all LAN and WAN networks. If RIP is globally enabled, it can then be specifically enabled or disabled on the LAN IP networks and in each remote site’s VC profile.

To globally enable IP RIP, use the command:

enable ip RIP

To globally disable IP RIP, use the command:

￿disable ip RIP

To see the current IP Forwarding and RIP status, use the following commands:

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3Com 812 manual Enable ip forwarding, Disable ip forwarding, Enable ip RIP, Disable ip RIP