On Thu, 27 Dec 2007, in the Usenet newsgroup comp.os.linux.networking, in
article , Barry wrote:

>I would like to provide dial-in access to my proxy server for a friend
>who can not afford an Internet account, but whose computer does have a
>modem. I would like this friend to be able to have Internet access
>by dialing into this proxy server, with authentication. In other
>words, I would be a one-client ISP.

-rw-rw-r-- 1 gferg ldp 70695 Jan 10 2001 ISP-Setup-RedHat-HOWTO

Obviously from the date, it's on the old side, and it's describing how
it's done on a RH7.0 system - but it's not using Red Hat specific tools.

>I already run a proxy server running Squid which listens for incoming
>Internet connections from a restricted range of ip's (for another
>unrelated project), and need to configure this server to listen for
>incoming dial-in connections on its modem.

The howto above

>I would also set up a DHCP server on this machine.

Dialin doesn't use DHCP, so unless you need it for some OTHER service,
it's not needed here. See the 'pppd' man page, and look at the colon
option (first item under the OPTIONS section).

>I'm sure this is possible, but would like to solicit specific
>ideas about how to proceed.

Start with the HOWTO - come back with details (your distribution being
one important one) if you need more help.

Old guy