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IP Setup and Network Address Translation 9-13
The Netopia R5000 Series Router supports multiple IP subnets on the Ethernet interface. You may want to
configure multiple IP subnets to service more hosts than are possible with your primary 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 virtually impossible to justify a Class A or
Class B assignment. This assumes that you are not using NAT.
If you are using NAT, you can use the reserved Class A or Class B subnet.
■ 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 Netopia R5000 Series Router.
A default gateway should be able to successfully route packets when the Netopia R5000 Series Router
cannot recognize the intended recipient’s IP address. A typical example of a default gateway is the ISP’s
router.
■ Select Primary Domain Name Server and enter the IP address for a domain name server. The domain
name server 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).
■ If a secondary DNS server is available, select Secondary Domain Name Server and enter its IP address.
The secondary DNS server is used by the Netopia R5000 Series Router when the primary DNS server is
inaccessible. Entering a secondary DNS is useful but not necessary.
■ Select Domain Name and enter your network’s domain name (for example, netopia.com). Netopia strongly
recommends that you enter a domain name.
■ Routing Information Protocol (RIP) is needed if there are IP routers on other segments of your Ethernet
network that the Netopia R5000 Series Router needs to recognize. If this is the case select Receive RIP
and select v1, v2, or Both from the pop-up menu. With Receive RIP set to v1, the Netopia R5000 Series
Router’s Ethernet port will accept routing information provided by RIP packets from other routers that use
the same subnet mask. Set to v2, the Netopia R5000 Series Router will accept routing information
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.
■ If you want the Router to advertise its routing table to other routers via RIP, select Transmit RIP and select
v1, v2 (broadcast), or v2 (multicast) from the pop-up menu. With Transmit RIP v1 selected, the Router will
generate RIP packets only to other RIP v1 routers. With Transmit RIP v2 (broadcast) selected, the Netopia
R5000 Series Router will generate RIP packets to all other hosts on the network. With Transmit RIP v2
(multicast) selected, the Router will generate RIP packets only to other routers capable of recognizing RIP
v2 packets.
■ Select Static Routes to manually configure IP routes. See the section “Static routes,” below.
■ If you select Address Serving Setup you will be taken to the IP Address Serving screen (see “IP address
serving” on page 9-22. Since no two hosts can use the same IP address at the same time, make sure that
the addresses distributed by the Router, and those that are manually configured are not the same. Each
method of distribution must have its own exclusive range of addresses to draw from.
■ Select Exported Services. The Exported Services screen appears with three options: Show/Change
Exports, Add Export, and Delete Export.