I deliberate changed the local account username on R1 so I can use a different password. If I leave the username as R2, R1 will use the password matching the authenticating server hostname - that's the caveat here.
I will now apply the ppp chap password command on R1.
R1(config-if)#ppp chap password sairam1
and 'no shut' the interface on R2;
*Mar 1 00:28:05.891: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up
*Mar 1 00:28:05.895: Se0/0 PPP: Using default call direction
*Mar 1 00:28:05.895: Se0/0 PPP: Treating connection as a dedicated line
I am not sure but I think that Sairam has asked about a mutual authentication of two PPP peers - whether it is possible for each peer to authenticate to the other peer with a different password.
If that is the case then I believe that it is not possible. I see two major reasons for that. First, the password in CHAP is used to generate a MD5 hash of a challenge and therefore must be known on both peers, as both of them must be able to compute the identical results. Second, the password to use with a peer is either determined by the command "ppp chap password" on an interface (it will be used for any CHAP authentication, incoming or outgoing, on that interface), or by looking it up in the user database according to the peer's name. Both these ways are static in the sense that they associate a particular password with a particular peer (or all peers on an interface) and for both incoming and outgoing authentication. Because of that, you cannot have two distinct passwords between two PPP peers and have them successfully authenticate against each other.
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