The PAP protocol for user authentication sends the user name and password, just as you would use if using a login. But the authentication process is handled by the PAP protocol implementation on the host rather than by a login implementation.
I think there may have been confusion with the PAP protocol, which, like CHAP, is a protocol defining a method of verifying a "user" to a "host" when the user and host are trying to set up a PPP connection. The PAP or CHAP protocol "runs on top of" PPP. This means the PPP connection happens first, then authentication over the PPP connection. A login based authentication process runs as normal text over a serial line (just like with a terminal) to login on the host, which then starts up the PPP program on the host (the "shell", if you like), which then establishes a PPP connection with the user. Bob Bernstein wrote: > > On Thu, Jul 13, 2000 at 02:35:32PM -0500, John Hasler wrote: > > > Nils asked about connecting some machines that serve Windows dialup clients > > from Linux: i.e., what kind of weird authentication are they likely to use? > > Joey answered that they most likely just use PAP. Turns out he was right. > > Help me understand why the absence of a shell login process on these > machines constrains them from using a simple exchange of username and > password. Is there no other implementation of ppp that can use > username/password? > > I have dialed up many an ISP with Dial-up Networking using this method, and > I doubt I was in a shell login process. (Or is this where I'm wrong?) PAP > has become popular, and ATT uses CHAP, but in principle is there anything > about not having a shell login that makes impossible an exchange of username > and password? Could it just be that on the system Nils has to connect to PAP > is what's been implemented? > > (I don't mean to be quarrelsome; I'm just trying to understand.) > > -- > Bob Bernstein > at http://www.ruptured-duck.com > Esmond, R.I., USA > > -- > Unsubscribe? mail -s unsubscribe [EMAIL PROTECTED] < /dev/null -- Bob McGowan Staff Software Quality Engineer VERITAS Software [EMAIL PROTECTED]
