From: Gene Thorne (gthorne@netcogov.com)
Date: Sat Jan 08 2005 - 22:15:10 GMT-3
The ISDN section IE lab 4 uses dialer interfaces. R4 authenticates R5 via
PAP, and R5 authenticates R4 via CHAP. I set this up with "encap ppp" on the
dialer interfaces and the default encapsulation on the physical interfaces,
and entered the appropriate authentication commands. The line came up fine,
but in looking at the debugs (debug ppp nego) I found that while the CHAP
authentication worked, the PAP authentication exchange never took place. It
didn't fail, it just never happened. When I put encap ppp on the R4 physical
interface as well as on the dialer interface, the PAP exchange occurred as
expected.
Is this normal behavior or something peculiar with the 2500s I was using?
Any rules for deciding when to put the encap ppp on the dialer interface,
the BRI, or both?
-gt
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