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Chapter 4 - RASFinder Software
Routing Information Protocol, Version 2 (RIPv2)
RIPv2 has enhanced "explicit" netmask information and supports several new features including
external route tags, subnet masks, next-hop addresses, and authentication. Subnet mask information
makes RIP more useful in a variety of environments and enables the use of variable subnet masks
on the network. Support for next-hop addresses permits the optimization of routes in an environment
that uses multiple routing protocols. For example, when RIPv2 is being run on a network along with
another IGP, and one router is running both protocols, then that router can indicate to the other RIPv2
routers that a better next-hop than itself exists for a given destination.
RIPv2 packet setup is accomplished at the bottom of each of the WAN tabs. The RIPv2 group
enables you to set up the send and receive packet types as either RIPv2 (default), RIPv1
Compatible, or None. You can also set up RIPv2 authentication here.
The Authentication subgroup is the RIPv2 mechanism for authenticating the sender of the routing
eliminates the vulnerability of the routing infrastructure. This authentication scheme is essentially the
same mechanism provided by OSPF. Currently, only a plain-text password is defined for
authentication.
For Plain Text RIPv2 authentication, the maximum length of the password is 16 characters; however,
Message Digest authentication can have a key id field of up to 50 characters.
On the WAN port tabs you can change any parameters that are active, including most of those
discussed (above) for the Ethernet tab plus the WAN IP Port Enable, Unnumbered Link, and the
Remote IP Address.
WAN 1, WAN 2, and WAN 3 Tabs
If you enable the IP routing master control on the Advanced tab but disable the control on this tab, all
IP packets received or to be transmitted on this WAN port will be discarded. Even if bridging is
enabled, the packets will not get across the link.
The Unnumbered Link option can be selected (checked) for the WAN ports for point-to-point links.
When selected, it disables the Port Address and Remote Address groups. Unnumbered links are
useful only between two routers; in this case, local and remote. When running RIP over a PPP link,
both ends of the link must be either unnumbered or numbered with the same IP subnet. An
advantage of not assigning an IP address to each WAN port is that you conserve valuable network
and subnet numbers.
Remote IP Address defines the IP address for the destination end of a point-to-point link and is
necessary only if the selected WAN port has been enabled for point-to-point operation. Note that the
MTASR3-200
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