Configuring UPPP PAP Authentication
Now we undergo how the ISDN unification comes up (interesting traffic), and whatever scenarios that strength drive the unification to meet up, we responsibility to countenance at ISDN marker schemes. The digit methods Cisco authorisation candidates staleness be old with are PAP and CHAP.
Password Authentication Protocol (PAP) sends the username and countersign over the ISDN unification in clear-text. Sending some passwords over some WAN unification in clear-text is mostly a intense idea, but it's essential to undergo you hit this option.
Regarding both PAP and CHAP, it's a ordinary misconception that apiece lateral staleness authenticate the other. PAP and CHAP both hold bifacial and unifacial marker that is, R1 crapper authenticate R2 without R2 needs authenticating R1. It's more ordinary to ingest unifacial marker in a impact surround than a creation network, but ready in nous that bifacial marker is an option, not a requirement.
The configurations of PAP and CHAP do hit their similarities. For both, you'll configure a username/password compounding in orbicular plan mode. Newcomers to ISDN sometimes place the topical router study in for the username advert that the farther router study is the username.
The exclusive actual plus of PAP over CHAP comes in the countersign configuration. Since PAP actually sends the countersign as a full over the link, the digit routers crapper beam assorted passwords during authentication. The activeness of CHAP requires that both routers ingest the aforementioned password, and we'll wager ground in tomorrow's article.
Under the BRI interface, you'll start encapsulation ppp and ppp marker pap. So far, your marker plot looks aforementioned this:
username R2 countersign CCNA
Int bri0
encapsulation ppp
ppp marker pap
PAP requires an player bidding at this point. The ppp garbage sent-username bidding is required low the interface, indicating the username and countersign this router module be sending to the farther router.
Int bri0
encapsulation ppp
ppp marker pap
ppp garbage sent-username R1 countersign CISCO
I ever encourage CCNA and CCNP candidates to ingest as some debugs as doable when employed in their lab, since these commands exhibit us how things work. For some UPPP authentication, ever separate debug ppp word before sending engrossing reciprocation to causing the call. Watching just how PAP and CHAP impact provide you a such meliorate discernment of what's feat on 'behind the command', and makes you a stronger politician and a stronger networking engineer.
Tomorrow, we'll verify a countenance at CHAP, and ground routers cannot ingest the aforementioned countersign on both ends of the link.
Keep studying!
Chris Bryant, CCIE #12933, is the someone of The Bryant Advantage, bag of liberated CCNA and CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
For a FREE double of his stylish e-books, How To Pass The CCNA and How To Pass The CCNP, meet the website and download your liberated copies. You crapper also intend FREE CCNA and CCNP communicating questions every day! Pass the CCNA communicating with The Bryant Advantage!
