Abrer_Wiki

The 'nice' protocol for data-link encapsulation over WAN. Provides AUTHENTICATION and LOAD-BALANCING via Multilinks.

Clear text, no no no! But if you had to.. Requirements: Local USERNAME and PASSWORD of credentials the REMOTE device will authenticate with. ppp auth pap

Requirements: USERNAME and PW created for PEERING/AUTHENTICATING DEVICES. eg– If R4 is connecting, a local user of R4 will need to exist. Passwords for authenticating devices will need to be consistent. No PW is sent over the WIRE. Only Hostname/Magic#. CHAP uses it's local PW along with the Hostname/Magic# of peering device and hashes it via MD5SUM. The MD5 hash is sent to each router. If the hash matches, the routers will authenticate and bring up the PPP link.

ppp auth chap

DOGS#sh run | i username
username CATS password 0 chap-auth  <-- **CATS** is name of remote device. **Passwords must match.**
DOGS#sh run int s0/0
Building configuration...

Current configuration : 130 bytes
!
interface Serial0/0
 ip address 172.16.1.1 255.255.255.252
 encapsulation ppp
 clock rate 2000000
 ppp authentication chap    <-- Enable CHAP Authentication!
end