EIGRP MD5 Authentication lab in GNS3 || EIGRP Authentication || CCNA 200-301 || Network Creator
Routing protocols can be configured to prevent receiving false routing updates and EIGRP is no exception. If you don’t use authentication and you are running EIGRP someone could try to form an EIGRP neighbor adjacency with one of your routers and try to mess with your network…we don’t want that to happen right?
EIGRP supports MD5 authentication. There is no plain text authentication.
What does authentication offer us?
Your router will authenticate the source of each routing update packet that it will receive.
Prevents false routing updates from sources that are not approved.
Ignore malicious routing updates.
A potential hacker could be sitting on your network with a laptop running GNS3 / Dynamips, boot up a Cisco router and try the following things:
1- Try to establish a neighbor adjacency with one of your routers and advertise junk routes.
2- Send malicious packets and see if you can drop the neighbor adjacency of one of your authorized routers.
So we need to configure EIGRP authentication.
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