When you earned your CCNA, you thought you learned every thing there is to know about RIP. We discovered [http://support.thejerseycompany.co.uk/entries/92929337-Just-How-To-Pimp-Out-A-Myspace-Profile-Using-Myspace-Layouts- company web site] by searching Google Books. Close, but not very! There are some further details you require to know to pass the BSCI exam and get 1 step closer to the CCNP exam, and one of those requires RIP update packet authentication. Youre familiar with some positive aspects of employing RIPv2 more than RIPv1, help for VLSM chief amongst them. But one particular advantage that you are not introduced to in your CCNA scientific studies is the capacity to configure routing update packet authentication. You have two alternatives, clear text and MD5. Clear text is just that - a clear text password that is visible by any person who can pick a packet off the wire. If you are going to go to the difficulty of configuring update authentication, you must use MD5. Clicking [http://sdk.juzi.cn/index.php?title=GillettCandelaria563 pr web] perhaps provides suggestions you can give to your co-worker. The MD stands for Message Digest, and this is the algorithm that creates the hash value for the password that will be contained in the update packets. Not only must the routers agree on the password, they have to agree on the authentication method. [http://www.drdavidmanning.com/showthread.php?tid=53599 Sponsors] is a splendid database for further about why to recognize this concept. If a single router sends an MD5-hashed password to yet another router that is configured for clear-text authentication, the update will not be accepted. debug ip rip is a great command for troubleshooting authenticated updates. R1, R2, and R3 are running RIP over a frame relay cloud. Right here is how RIP authentication would be configured on these three routers. R1#conf t R1config#key chain RIP < The key chain can have any name. R1config-keychain#important 1 < Key chains can have multiple keys. Number them carefully when using multiples. R1config-keychain-key#important-string CISCO < This is the text string the key will use for authentication. R1config#int s0 R1config-if#ip rip authentication mode text < The interface will use clear-text mode. R1config-if#ip rip authentication crucial-chain RIP < The interface is using key chain RIP, configured earlier. R2#conf t R2config#crucial chain RIP R2config-keychain#key 1 R2config-keychain-crucial#important-string CISCO R2config#int s0.123 R2config-subif#ip rip authentication mode text R2config-subif#ip rip authentication essential-chain RIP R3#conf t R3config#essential chain RIP R3config-keychain#essential 1 R3config-keychain-crucial#crucial-string CISCO R3config#int s0.31 R3config-subif#ip rip authentication mode text R3config-subif#ip rip authentication important-chain RIP To use MD5 authentication rather than clear-text, just replace the word text in the ip rip authentication mode command with md5. Heres what a successfully authentication RIPv2 packet looks like, courtesy of debug ip rip. Clear-text authentication is in impact and the password is cisco. 3d04h: RIP: received packet with text authentication cisco 3d04h: RIP: received v2 update from 150.1.1.three on Ethernet0 3d04h: one hundred.../8 by means of ... in 1 hops 3d04h: 150.1.two./24 by way of ... in 1 hops Heres what it looks like when the remote device is set for MD5 authentication and the regional router is set for clear-text. Youll also see this message if the password itself is incorrect. 3d04h: RIP: ignored v2 packet from 150.1.1.three invalid authentication Debug ip rip might be a basic command as compared to the debugs for other protocols. but it is also a extremely effective debug. Start employing debugs as early as achievable in your Cisco scientific studies to learn how router commands actually function!. Discover further on this affiliated paper by browsing to [http://www.wilmingtonpoolsonline.com/blog/members/jnxyvjcccmec/activity/190448 Wilmington Pools Blog - Page 190448].
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