Hi all,
I have one question about PPP CHAP authentication where I don't find any
documentation explaining the following in detail.
Suppose we have two routers R7 and R8 connected directly via Back2Back serial
and an encapsulation of PPP.
As far as I understand the following applies:
For the successful of a mutual CHAP authentication the following preconditions
should match.
1. R7 knows of a password used for its authentication against R8
2. R8 knows R7s password to check for successful authentication
and vice versa.
I thought for Point 1 the configuration line "ppp chap password …" is used
And for Step 2 a normal username/password line is needed like in the example
below.
Interestingly, this does not work until I uncomment the lines preceded with an
exclamation mark
where the password for the router itself is configured.
Now, I am confused about the relation between the three passwords per side
("username REMOTEROUTER password PW", "username THISROUTER password PW", "ppp
chap password PW").
Why is it necessary to specify them all?
Cheers,
Christian
#### On R7:
username R8 password ipexpert
!username R7 password ipexpert
interface Serial0/0/0
ip address 192.168.11.5 255.255.255.252
encapsulation ppp
clock rate 2000000
ppp authentication chap
ppp chap password ipexpert
#### On R8 :
username R7 password ipexpert
!username R8 password ipexpert
interface Serial0/0/0
ip address 192.168.11.6 255.255.255.252
encapsulation ppp
ppp authentication chap
ppp chap password ipexpert
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