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Learning by Doing: CISCO Certified Network ... - SCN Research

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06:47:25: BR0/0:1 PPP: Treating connection as a callout<br />

06:47:25: BR0/0:1 PPP: Phase is ESTABLISHING, Active Open<br />

06:47:25: BR0/0:1 LCP: O CONFREQ [Closed] id 51 len 10<br />

06:47:25: BR0/0:1 LCP: MagicNumber 0x030BEA68 (0x0506030BEA68)<br />

06:47:25: BR0/0:1 LCP: I CONFREQ [REQsent] id 77 len 15<br />

06:47:25: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)<br />

06:47:25: BR0/0:1 LCP: MagicNumber 0x055899FC (0x0506055899FC)<br />

06:47:25: BR0/0:1 LCP: O CONFACK [REQsent] id 77 len 15<br />

06:47:25: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)<br />

06:47:25: BR0/0:1 LCP: MagicNumber 0x055899FC (0x0506055899FC)<br />

06:47:25: BR0/0:1 LCP: I CONFACK [ACKsent] id 51 len 10<br />

06:47:25: BR0/0:1 LCP: MagicNumber 0x030BEA68 (0x0506030BEA68)<br />

06:47:25: BR0/0:1 LCP: State is Open<br />

06:47:25: BR0/0:1 PPP: Phase is AUTHENTICATING, <strong>by</strong> the peer<br />

06:47:25: BR0/0:1 CHAP: I CHALLENGE id 41 len 27 from "smarts"<br />

06:47:25: BR0/0:1 CHAP: Username smarts not found<br />

06:47:29: BR0/0:1 CHAP: Unable to authenticate for peer<br />

06:47:29: BR0/0:1 PPP: Phase is TERMINATING<br />

06:47:29: BR0/0:1 LCP: O TERMREQ [Open] id 56 len 4<br />

06:47:29: BR0/0:1 LCP: I TERMACK [TERMsent] id 56 len 4<br />

06:47:29: BR0/0:1 LCP: State is Closed<br />

06:47:29: BR0/0:1 PPP: Phase is DOWN<br />

Here we are looking for a username that does not exist. So we go in and make a<br />

username “smarts” (like it is asking for) with a password (usually the enable secret<br />

password).<br />

So what have I learned here?<br />

So is your mind fried yet? In this lab we learned how the theory of how ISDN operates<br />

and how to troubleshoot it. Like our other troubleshooting labs we just follow the OSI<br />

model. Please keep in mind that ISDN problems may not always be ISDN-related. In<br />

one of the next labs you will be setting up ISDN between four routers. At first when I<br />

could not get it to work I ran through my IDSN troubleshooting steps. I also used ICMP<br />

debug commands. Still it wouldn’t work. Then I remembered an obscure reference to a<br />

PPP command (MLP-PPP multilink) that made it work. So, what seems to be causing the<br />

problem may not be it at all. Keep your mind open. If something bothers you too much,<br />

just walk away and go shoot some pool for an hour. You would be amazed how easy the<br />

answer comes after that. Plus its fun to go shoot pool too.<br />

445

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