General notes:

	To call another PPP system, it's helpful to use the "chat" program
	to dial the modem.  I use the following command line:

	pppd connect 'chat "" ATDT5551212 CONNECT "" ogin: ppp' netmask 255.255.255.0 /dev/ttya 38400

	which says, "dial 555-1212, watch for 'login:' then type 'ppp'". It
	sets the netmask and uses ttya at 38400.

	The "other" side could be running a pppd like:

	pppd passive netmask 255.255.255.0 /dev/ttya 38400

Debugging notes:

	SunOS /Streams:

	Be sure to leave in the PPP_STATS define (in ppp_if.c) and
	DEBUGS defines in both ppp_if.c and ppp_async.c	to enable the
	use of slstats and kernel debugging if you need	it in the future.

	If you experience problems, you may wish to enable the streams debug
	statements in the kernel, you can do this using adb.

	% adb -w -k /vmunix /dev/mem

		ppp_if_debug
		/ D
		/ W 1
		ppp_async_debug
		/ D
		/ W 1
		^D

	Error messages and diagnostics will show up in /usr/adm/messages.

	You can also enable debugging of the incoming raw PPP frames that
	are passed from the ppp_async streams module to the ppp_if
        module.  Note that doing so will add quite a bit of 
        overhead to each incoming frame and can cause timeouts to
        occur in the higher level PPP functions.  Because of this,
        you should limit the number of bytes to be printed.  If a
        frame is received that is larger that the specified maximum,  a ">"
        character is appended in the log.  The maximum number of bytes
        per frame that will be logged can be set by changing the value
        of ppp_async_input_debug in the kernel.  A value of zero turns
        off the logging altogether. Do the following to enable this feature: 

	% adb -w -k /vmunix /dev/mem

		ppp_async_input_debug
		/ D
		/ W 80  (or however many bytes (in hex) you wish to dump)
		^D


	If you experience problems 'uploading' binary files from your PPP
	client through the PPP gateway, you may wish to alter the asyncmap
	of the gateway using the -as <hex map value> on the ppp command line.


Bugs to:

	brad@fcr.com
	Brad Parker
	FCR Software, Inc.
	398 Columbus Ave, suite 201
	Boston, Ma 02116

Thanks to:

	Greg Christy (gmc@quotron.com)
	Drew D. Perkins (ddp@andrew.cmu.edu)
	Rick Adams (rick@seismo.ARPA)
	Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).


Copyrights:

	Copyright Restrictions (applies to ppp_if.c, ppp_async.c and
	#ifdef STREAMS changes in the ppp.c and related modules)

	This code is Copyright (C) 1989, 1990 By Brad K. Clements, 
	All Rights Reserved.

	You may use this code for your personal use, to provide a non-profit
	service to others, or to use as a test platform for a commercial
	implementation.

	You may NOT use this code in a commercial product, nor to provide a 
	commercial service, nor may you sell this code without express
	written permission of the author.

	Otherwise, Enjoy!

	
