Netopia 4000 Series Software Manual Download

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IP Setup 6-3

The Netopia Firmware Version 5.4 suppor ts multiple IP subnets on the Ethernet inter face. You may want to
configure multiple IP subnets to ser vice more hosts than are possible with your primar y subnet. It is not
always possible to obtain a larger subnet from your ISP. For example, if you already have a full Class C
subnet, your only option is multiple Class C subnets, since it is vir tually impossible to justify a Class A or
Class B assignment.

If you are using NAT, you can use the reser ved Class A or Class B subnet.

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Select

Default IP Gateway

and enter the IP address for a default gateway. This can be the address of any

major router accessible to the Router.

A default gateway should be able to successfully route packets when the Router doesn’t know how to route
to the intended recipient’s IP address. Typically, a default gateway is the ISP’s router.

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If a backup gateway is available, select

Backup IP Gateway

and enter the IP address of a gateway that you

want to use for backup in the event of a connection failure. See

“Backup Default Gateway” on page 7-13

for configuration details.

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Select

Primary Domain Name Server

and enter the IP address for a domain name ser ver. The domain

name ser ver matches the alphabetic addresses favored by people (for example, robin.hood.com) to the IP
addresses actually used by IP routers (for example, 163.7.8.202).

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If a secondar y DNS ser ver is available, select

Secondary Domain Name Server

and enter its IP address.

The secondar y DNS ser ver is used by the Router when the primar y DNS ser ver is inaccessible. Entering a
secondar y DNS is useful but not necessar y.

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Select

Domain Name

and enter your network’s domain name (for example, netopia.com). Netopia strongly

recommends that you enter a domain name.

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Routing Information Protocol (RIP) is needed if there are IP routers on other segments of your Ethernet
network that the Router needs to recognize. If this is the case select

RIP Options

and press Return. This

will take you to the Ethernet LAN RIP options screen, where you can configure several parameters,
including RIP v2 MD5 Authentication. See

“RIP-2 MD5 Authentication” on page 6-10

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With Receive RIP set to v1, the Ethernet por t will accept routing information provided by RIP packets
from other routers that use the same subnet mask. Set to v2, the router will accept routing informa-
tion provided by RIP packets from other routers that use different subnet masks. Set to Both, the
router will accept information from either RIP v1 or v2 routers.

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With Transmit RIP v1 selected, the router will generate RIP packets only to other RIP v1 routers. With
Transmit RIP v2 (broadcast) selected, the router will generate RIP packets to all other hosts on the net-
work. With Transmit RIP v2 (multicast) selected, the router will generate RIP packets only to other rout-
ers capable of recognizing RIP v2 packets.

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If you want to enable Multicast For warding, select

Multicast Forwarding

and from the pop-up menu,

choose the type that you want to enable. See

“Multicast For warding” on page 6-34

for detailed

configuration.

If you enable Multicast For warding, the next field

IGMP Version

appears. You can choose v1 or v2 from the

pop-up menu.