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Date:      Sun, 15 Feb 1998 20:32:54 -0700
From:      Michelle Brownsworth <michelle@eugene.net>
To:        freebsd-questions@FreeBSD.ORG
Subject:   FreeBSD as a PPP Dialup Router
Message-ID:  <v0300781cb10d630b0ef2@[206.100.174.69]>

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Folks, I thought you might help shed some light on the matter discussed
below in a letter to Jeremy Childs:

Mr. Childs, I recently discovered your informative article, "Configuring
FreeBSD as a PPP Dialup Router" at
http://www.ssimicro.com/~jeremyc/ppp.html.  I read it with interest,
because that's exactly what I'm doing.  I'm in the process of setting up a
LAN at home which will use a FreeBSD machine to dial up (using ijppp) to my
other FreeBSD server (which is connected to the Internet via a T1 and uses
pppd to service dial-in connections).  I rejected as overkill my original
notion of using a Livingston router, and decided to configure the FreeBSD
server at home to do duty as router.  My LAN at home is a subnet, not part
of the C-block of the server to which I'm connecting.  And that leads me to
my question.  In your article, you stated:

"The proxyarp option takes care of all the routing, so all you need for the
remote clients IP addresses are two free IP addresses on the same subnet as
the server's IP address."

My confusion stems from the fact that my server at home is not on the same
subnet as the IP address of the server I'm calling:

wintermute.primelogic.com	206.100.174.64	# On T1 (C-block)
straylight.primelogic.com	208.151.228.65	# At home (subnet /224)

I have dedicated a couple of IP's especially for PPP on wintermute:

local.primelogic..com		206.100.174.68	# IP not assigned to
ethernet card
remote.primelogic..com	206.100.174.69

So, may I infer from your statement above that I should use 206.100.174.69
as the remote address in wintermute's /etc/ppp/options (or
/etc/ppp/options.ttyd1), rather than straylight's subnet IP?  If so, then
the subnet IP's are relevant only for straylight's and the other LAN hosts'
ethernet cards, and would play no part at all in the PPP configuration.
This makes intuitive sense, since  straylight's subnet IP is assigned to
ed1, straylight's ethernet card.  Assigning the address concurrently to
user PPP's tun0 device seems wrong.

I've reached a point where I clearly need to check my fundamental
assumptions.  If I'm on the right track then I can concentrate on finding
the reasons why I'm getting "LCP: timeout sending Config-Requests" errors,
and why straylight can't "ping localhost" or "ping straylight" once the PPP
connection is (sort of) made.

Thank you for your time.

.\\ichelle
--------------------------
Michelle Brownsworth
PrimeLogic Communications
http://www.primelogic.com



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