I am trying to understand how md5 authentication works between this 2 cisco routers. The password is cisco in both routers. In the output in the field Auth Data: the hash is different in every packet. Is this the result of a salt? Whats the reason of the field auth crypto sequence number? Does each router has a counter and after initial synchronization both routers increase this counter?
Cisco allows only for max 8 character password so perhaps is using some 'other' algorithm. It is stated that the algorithm is md5 when you issue the command. After some quick queries in some online cracking websites (with rainbow tables) i was not able to reverse the hash. Is this some security by obscurity ?