Routing security should be the most important part of any network security. Routers are often over looked while securing networks. Closed network routing also requires router security. This little detail is overlooked by every IT professional who is working on network security. It is most of the time disregarded as important because routers cant be compromised from the outside. Routers can be broken from the inside much easily, hence they need to be a part of the security policy.
Large corporations use internal subnets in protocol for routing in the infrastructure network so that they can make the route path discovery automatic. They rely their routing information and routing table to each other so that it functions properly. Route protocols in network passes set up will help in allowing all the network routers to receive the information. The router are mainly configured by routing protocols such as OSPF, EIGRP and RIP which make the process of updating the router tables automatic without checking from where these protocols came from. This leave the routers vulnerable to outside intruders to place any packets of their own which can be used to infiltrate the entire system. This little flaw in security will give an attacker freedom to begin a denial of service attack or completely shut down the network.
To avoid these sort of infiltrations, network administrators can use stricter protocols such as the EIGRP, which only send information about routing after routes on the network change. Even if not EIGRP you can use the updated current generation protocol. There are other problems in a network router that infiltrators can use. Most of the times the strength of a network is according to the weakest link in the network. Hence you can not afford to leave one area insecure and concentrate all your energy in one area.