Just like any other ppp type connection. After the physical layer comes up and the routers realize that they are running ppp encap, they will start sending lcp config requests. If during LCP they negotiate an authentication protocol and both agree on which to use they will, after lcp finishes, do authentication. If you need to configure it do this:
config t
int dialerX
ppp authentication pap chap callin !might as well do both and only let them authenticate us
ppp chap hostname (yourusername)
ppp chap password (yourpassword)
ppp pap sent-username (yourusername) password (yourpassword)
end
Watch "debug ppp nego" to see how it works.
Josh
