Netopia 3346N-ENT User Guide (en)

IP Setup   7-3
The Netopia Firmware Version 8.6.1 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.
Select Default IP Gateway and enter the IP address for a default gateway. This can be the address of any 
major gateway 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 gateway.
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 
for configuration details.
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, to the IP 
addresses actually used by IP gateways (for example, 
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.
Select Domain Name and enter your network’s domain name (for example, 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 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 
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.
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.
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 
To configure multiple IGMP options, go to the IGMP Setup menu. See 
If you want to create Vir tual Redundant Routers, select VRRP Options and press Return. You will be taken 
to the Ethernet LAN VRRP Options screens. See 
Select Static Routes to manually configure IP routes. See the section