Information Technology Reference
In-Depth Information
Common RIPv2 Issues
When troubleshooting issues specific to RIPv2, there are several areas to examine. A good place to
begin troubleshooting a network that is running RIP is to verify that the
version 2
command is config-
ured on all routers. Another source of problems might be incorrect or missing
network
statements
configured with the
network
command. This will cause routing updates to not be sent and received on
an interface. If there is a need to send specific subnets of a classful network, make sure that automatic
summarization has been disabled with the
no auto-summary
command. Also, make sure that RIP
updates have not been inadvertently disabled with the
passive-interface
command.
Authentication
A security concern of any routing protocol is the possibility of accepting invalid routing updates. The
source of these invalid routing updates could be an
attacker
maliciously attempting to disrupt the net-
work or trying to capture packets by tricking the router into sending its updates to the wrong destina-
tion. Another source of invalid updates could be a
misconfigured
router or even a host computer that is
running the routing protocol unbeknownst to its user.
Whatever the reason, it is good practice to authenticate routing information. RIPv2, Enhanced IGRP
(EIGRP), Open Shortest Path First (OSPF), Intermediate System-to-Intermediate System (IS-IS), and
Border Gateway Protocol (BGP) can be configured to encrypt and authenticate routing information.
This practice hides the content of the routing information, and routers will only accept routing infor-
mation from other routers that have been configured with the same password or authentication infor-
mation.
