MPPE and MS-CHAP

Hello Experts!

I could really use a little explanation on MPPE with MS-CHAP....docs are a
bit scarce, or I'm just looking in the wrong places...
Please clarify my thoughts...

So here's what I have,

I set up a simple topology (R5--->R4) with one way ms-chap authentication
and MPPE and everything works great.

But, when I attempt two way authentication (with encryption), it fails.
 From this I conclude that because of the encryption, the second
authentication attempt fails because
it's not encrypted. Is that the case?

*Working config:*

R4

username R5CHAP password CISCO

interface Serial1/1
 ip address 45.0.0.4 255.255.255.0
 encapsulation ppp
 keepalive 10 3
 clock rate 72000
 ppp encrypt mppe 128 required
 ppp authentication ms-chap

R5

interface Serial1/1
 ip address 45.0.0.5 255.255.255.0
 encapsulation ppp
 keepalive 10 3
 ppp encrypt mppe 128
 ppp chap hostname R5CHAP
 ppp chap password 0 CISCO

*Failing config:*

R4

username R5CHAP password CISCO

interface Serial1/1
 ip address 45.0.0.4 255.255.255.0
 encapsulation ppp
 keepalive 10 3
 clock rate 72000
 ppp encrypt mppe 128 required
 ppp authentication ms-chap
 ppp chap hostname R4CHAP
 ppp chap password 0 CISCO

R5

username R4CHAP password CISCO

interface Serial1/1
 ip address 45.0.0.5 255.255.255.0
 encapsulation ppp
 keepalive 10 3
 ppp encrypt mppe 128 required
 ppp authentication ms-chap
 ppp chap hostname R5CHAP
 ppp chap password 0 CISCO

Thanks!

Blogs and organic groups at http://www.ccie.net
Received on Tue Jul 19 2011 - 21:46:42 ART