Have you read: TS flow chart http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a00800b4130.shtml
general config docs http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a00800b4131.shtml http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a0080094333.shtml?referring_site=bodynav 'debug ppp authentication' and 'debug ppp negotiation' are your friends. Matt On Sat, Sep 21, 2013 at 8:53 AM, Christian Schröder <[email protected]> wrote: > 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 > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
