Point-to-Point Protocol (PPP) Notes
Point-to-Point Protocol (PPP)
R1(config)# int s0/0
encapsulation ppp
On the exam, they will always ask for authentication
Authentication
– Password Authentication Protocol (PAP)
-> Plain text
-> One way or two way
-> One time authentication
– Challenge Handshake Authentication Protocol (CHAP)
-> Encrypted
-> Periodic authentication
PPP Authentication
– Server / Client authentication
-> Server (authenticator) authenticates by comparing received credentials with the security database
-> Client (authenticated) sends credentials to be authenticated
R1(config)# username R2 password CISCO
int s0/0
encapsulation ppp
ppp authentication pap
R2(config)# int s0/0
encapsulation ppp
ppp pap sent-username R2 password CISCO
CHAP
R1(config)# username R2 password CISCO
int s0/0
encapsulation
ppp authentication chap
R2(config)# int s0/0
encapsulation
ppp chap hostname R2
-> sent as username
ppp chap password CISCO
– If the ppp chap hostname is not configured, the router hostname will be sent as the username
Mutual Authentication
R1(config)# username R1 password CISCO
int s0/0
encapsulation ppp
ppp authentication chap
R2(config)# username R2 password CISCO
int s0/0
encapsulation ppp
ppp authentication chap
Multi Link Point-to-Point Protocol (MLPPP)
R1(config)# int s0/0
encapsulation ppp
ppp multilink
ppp multilink group 1
int s0/1
encapsulation ppp
ppp multilink
ppp multilink group 1
int multilink1
ip address 10.0.0.1 255.255.255.0
ppp multilink
ppp multilink group 1
In IOS 12.4, the multilink interface number has to match the group number
Load-balancing
– Frame level
– Divided equally
– Should be used on high end routers
show ppp multilink
show int multilink1
Verification
sh ppp int <int>
sh ppp all
sh int <int>
ping <ip address>
