Note from archiver<at>cs.uu.nl:
This page is part of a big collection
of Usenet postings, archived here for your convenience.
For matters concerning the content of this page,
please contact its author(s); use the
source, if all else fails.
For matters concerning the archive as a whole, please refer to the
or contact the archiver.
Subject: comp.protocols.ppp part3 of 8 of frequently wanted information
This article was archived around: 8 Oct 1996 19:18:17 GMT
Version: $Revision: 3.10 $
Last-modified: $Date: 1995/11/13 20:10:17 $
PPP configuration recipes
3. HOW TO (CONFIGURATION RECIPES)
complain about missing or incorrect information in the FAQ list
connect a single host to a network without needing a new subnet.
configure free ppp for sun to interoperate with MacPPP 1.0
get SCO TCP 1.2 to connect to Ethernet LANs by a PPP link
use PPP through a X.25 PAD
use SunLINK PPP 1.0 to a CISCO
through a sync line
use MacPPP 2.0.1 on non-US
System 6 MACs
stop MacPPP to dial without being told to
3.0 complain about missing or incorrect information in the FAQ list
email@example.com (Ignatios Souvatzis)
and add information I'll need to think about it. That is:
In case of incorrect information, send me the correct information
and the source of it.
In case of missing information, send me the information which is
missing and the source of it.
3.1 connect a single host to a network without needing a new subnet.
If you have only one single machine on the other side, the easiest way
is to give it a IP address belonging to the local ethernet/IP subnet,
and to tell the ppp gateway machine to advertise (proxy arp) its own
ethernet address as the other machines'. Works like a charm at our site.
Of course, for a large group or complicated network on the other side,
you would get more management problems.
On the gateway do:
arp -s othermachinesipaddress myownethernetaddress permanent public
ifconfig pppNUMBER myipaddress othermachinesipaddress [other params] up
on remote machine:
ifconfig pppNUMBER gatewaysipaddress [other params] up
route add default gatewaysipaddress 1
pppNUMBER might be spelled as dpNUMBER for dialup IP.
Of course, if you use routeing daemons, you could also propagate the
route via routed / gated etc. to other machines, but it's more painful
because every machine has to do it (and might choose not to do it), and
every machine doing IP on a Ethernet HAS to talk arp.
On intermittently connected demand-dialed links, you may need to edit
/etc/gateways to define the destination of the PPP or SLIP connection as
a "passive" link. Otherwise, routed will remove routes from the
kernel's routing table that use that link, because it won't hear RIPs
coming from hosts or routers across the wire. Since it doesn't hear
anything from hosts or routers on the far side of the wire, routed
assumes that the link is dead forever.
firstname.lastname@example.org (Ignatios Souvatzis)
3.2 configure KA9Q PPP and it's Unix counterpart
From: kim@MorningStar.Com (Kim Toms)
Subject: Re: PPP for DOS? (good info for FAQ)
Date: Wed, 9 Dec 1992 06:26:28 GMT
I have been able to use the ka9q software on my PC to call my Suns at
work. This is available from merit.edu:/pub/ppp/ka9q.zip. I had to tell
our Sun product [that would be Morning Star PPP, see below. I.S.]
"nolqm" in order to prevent it from hanging up because of an lqm
failure, but other than that, I have had no trouble.
Below, I include the configuration I use on my pc. I unpacked the ka9q
distribution into \ka9q. All the configuration files are located there.
I have also been able to use the NCSA telnet packet driver, however, I
could not use ftp with that, so I gave it up some months ago.
Here's what I use on the PC:
In a file called "doit2.bat":
net -d \ka9q dialup.net
In a file called "dialup.net":
ip address 126.96.36.199
attach asy 0x3f8 4 ppp pp0 1024 256 9600
dialer pp0 dialup.ppp
ppp pp0 trace 2
ppp pp0 quick
ppp pp0 lcp open
ppp pp0 ipcp open
route add default pp0
ip ttl 32
tcp mss 1460
tcp window 2920
domain addserver 188.8.131.52
domain suffix MorningStar.Com
domain cache clean on
In a file called "dialup.ppp":
wait 3000 "OK"
wait 60000 "login: "
wait 5000 "word:"
3.2.2 CONFIGURE KA9Q PPP (WITH NEW DIALER) AND IT'S UNIX COUNTERPART
deleted, becausy to my knowledge, there is no KA9Q with new dialer and
3.2.3 CONFIGURE JNOS
I have jnos1.08 up and running. [that is, 'version 911229 (WG7J
v1.08)']. For a sample configuration, get the configuration and
executable you can ftp from speckled.mpifr-bonn.mpg.de, user ftp,
directory /pub/rhein.de or /pub/incoming. The remarks in 3.3 about
'vjmode draft' or 'vjmode 1331' apply here, too.
email@example.com (Ignatios Souvatzis)
3.3 configure NCSA with the merit ppp packet driver and its unix
I had at least partial success using the parameters, to the public ppp
for SUNOS (dp-2.3, but I suspect any of dp-2.1 or dp-2.2* or
pppd-1.01beta or ppp-1.1 would have the same behaviour) -ac -pc vjmode
draft. The latter would be called in ppp-1.1 (and up) 'vjmode rfc1331'.
firstname.lastname@example.org (Ignatios Souvatzis)
3.4 work BOOTP over protocols such as SLIP or PPP
From: email@example.com (Steven L. Johnson)
Subject: Re: Tech?: BOOTP over SLIP or PPP
Date: Wed, 2 Dec 1992 03:14:37 GMT
[Somebody on the net] writes:
Does anybody know if there is a description of how to work BOOTP over
protocols such as SLIP or PPP. It seems this should work but the problem
is that there is a field in the BOOTP header that contains the physical
layer type, and these numbers are defined as the hardware types for ARP.
Since SLIP and PPP do not use ARP, they do not have numbers.I haven't
looked very far, and would appreciate a pointer to any previous work or
concensus. I've used a type 0 but only with a cisco terminal server. I
don't know if this causes problems on other implementations.
The second problem is that the BOOTP header also contains a field for
the physical layer address (i.e. Ethernet address). PPP and SLIP do not
have an physical layer addresses. What does the BOOTP server have to
base it's IP address suggestion on? It's my understanding that PPP can
itself negotiate the IP address and that this is the preferred method.
If the IP address is included in the bootp request then the remaining
configuration is done based on that IP address and not the hardware
address. With SLIP there isn't this option, so the IP address must be
assigned by knowing the physical port on which the request was received.
Again, I used an address of 0 (with a address length of 0, I think) and
this didn't seem to cause a problem.
On a terminal server that contained only a minimal implementation of
bootp, it was necessary to send two requests. The first request was
satisfied by the terminal server and configured only the IP address. A
subsequent request (that contained the IP address provided by the first
request) was forwarded by the terminal server to a bootp server on the
ethernet and provided the rest of the configuration from a standard
3.5 configure free ppp for sun to interoperate with MacPPP 1.0
From: firstname.lastname@example.org (Guy K Hillyer)
Comments-by: Ignatios Souvatzis, marked with [comments... I.S.]
Subject: Success with MacPPP
Date: Wed, 20 Jan 1993 02:02:08 GMT
After many travails, I finally got MacPPP to work for me. This is the
story of how I got it to work. This account is purely anecdotal. I
don't claim to know what is the best configuration, just what worked for
I submit this for the benefit of other poor suckers who might otherwise
spend days getting a Mac/Sun PPP link to work, like I did. I'm a happy
camper now, and thanks to Larry Blunk @ merit.edu for making his
implementation freely available. Now all I need is a T1 line to my
house and I'll be all set.
[I'm not sure MacPPP works on T1 lines, I'm pretty sure the Perkins et
al. PPP doesn't work over T1 lines. I.S.]
After working with the beta release for a while, I picked up the latest
and greatest MacPPP at merit.edu. The file is named
/pub/ppp/macppp1.0.sit.hqx. I don't think there's any big difference
between that and the beta version, but the docs did have two or three
new sentences that helped to clarify matters.
The ppp I'm using on the UNIX side is the one identified as
`Perkins/Clements/Fox/Christy PPP for SunOS' in the comp.protocols.ppp
FAQ. During the course of debugging my connection, I installed the
package identified in that document as dp-2.2, but it behaved in exactly
the same way as the other one did with regard to the problems I was
having, so I only tried it briefly. It has some more advanced
capabilities so I may switch to it in the future, but for now I'm just
glad to have a working configuration.
One mistake I made was ignoring the point made in the MacPPP docs
about configuring MacTCP for server addressing. I thought that
"server addressing" implied that the mac would get its IP address
from some kind of server on my network, using RARP or something like
that. I thought that didn't make sense in my situation, so I
configured MacTCP for manual addressing. In fact, I now believe
that "server addressing" means that TCP gets the address from the IP
layer. I'm not an ISO networking model savant, so this
[must be wrong... the IP layer gets its address from the PPP layer,
which can do an address negotiation.]
notion should be taken with a grain of salt.
I also set MacTCP to have a "class C" network address. I think
this only matters for broadcast packets, because it sets the
netmask. Again, I'm treading on thin ice here.
I set the IP addresses in the MacPPP control panel's IPCP
configuration window. This probably isn't necessary, but I wanted
to make sure that I got a particular address. If you set the
addresses on the Mac side, you'll want to specify the addresses and
disable IP address negotiation on the UNIX side ("-ip" option to
I first got things working with VJ header compression disabled on
both sides. You may want to try it this way if you have any
trouble. This is set in the IPCP window. If you disable VJ header
compression on the Mac side, you'll want to disable it on the UNIX
side as well ("-vj" option to ppp).
[You probably need only to set it to 'draft'. The configuration
negotiation should do the rest. The only reason you need a 'vjmode'
option is that the format of the configuration option has changed and
the older ones don't understand the format of the aug91draft or
rfc1331 ones (which should be the same) I.S.]
Once I got things working I turned on VJ header compression. It
only worked for me if I selected "draft" mode on the UNIX side
("vjmode draft" option to ppp).
I configure the ppp interface like this:
ifconfig ppp0 <Sun's IP addr> <Mac's IP addr> netmask 0xffffff00 do
Then I start ppp like this:
ppp -p vjmode draft -ip <Sun's IP addr>:<Mac's IP addr>
[which is also about the configuration of dp-2.x, on the login line.
You have to specify PPP_OPTIONS=vjmode,draft in the configuration file
for the network interface used by the mac. For ppp-1.1/2.tar.Z, use
'vjmode rfc1331' I.S.]
The "-p" means passive, so the Sun waits for the Mac to start the
handshaking. My experience was that without -p, there was a very
brief window during which the Mac could enter the negotiation, and
if it missed window, then all was lost.
"vjmode draft" means to use the new version of negotiation
specified in the August 1991 Draft RFC for IPCP. This is apparently
the only version MacPPP knows how to deal with. If you've disabled
VJ header compression on the Mac, you should give "-vj" instead.
"-ip" disables IP address negotiation. It probably would work
fine without this; I just haven't tried it that way.
3.6 get SCO TCP 1.2 to connect to Ethernet LANs by a PPP link
From: bob@MorningStar.Com (Bob Sutterfield)
Subject: Re: PPP on SCO between different networks
In some news message, somebody asked:
I need to set up a UNIX system which is on an ethernet LAN (with
its own IP address), so it can call up a PPP link to another network,
and use a different IP address on the remote network. There's a bug in
SCO TCP 1.2 (but not in 1.1.3) that prevents this scenario with SCO's
PPP, and with any other PPP or SLIP software you might try to use on
your SCO system. You can get the fix from
ftp.morningstar.com:pub/tools/SCO-route-fix, or through SCO's normal
3.7 use PPP through a X.25 PAD
From: email@example.com (Markus Kuhn)
Subject: Re: PPP or SLIP through PAD (X.29/X.25)
Date: Mon, 5 Apr 1993 19:30:17 +0200
Organization: Regionales Rechenzentrum Erlangen, Germany
Does anybody have experience with "tunneling" PPP and SLIP through the
PAD-service (X.29 over X.25)? What I want is to let people dial up their
PAD-service and send their PPP/SLIP packets across the X.25 network into
the PAD-login of my UNIX-machine. This should be possible, but I guess
the PAD-parameter configuration is critical?? Yes, that's of course
possible, because that's the way I use PPP. Use the PAD parameters for
the following settings:
no escape character 1:0
local echo off 2:0
flow/control: RTS/CTS 5:2 (this is perhaps not a standard X.3
PAD should not react on XON/XOFF signals 12:0
Other important values might be 3:0 4:1 9:0 10:0 13:0 14:0 15:0.
You need a PAD that supports CTS/RTS flow control, because I don't know
about PPP software that supports XON/XOFF (although this would be
possible with the right async map).
3.8 use SunLINK PPP 1.0 to a CISCO through a sync line
To connect successfully a Sun running 4.1.x and Sunlink PPP 1.0 to a
Cisco, you have to get patch 100941-02. Once it it installed, everything
works smoothly, as written in the documentation!
My sun is an SS2, running 4.1.2 (sun4c architecture). We have a
'Transfix' digital leased line. That is: synchronous serial line,
The problem without the patch is that everything seems to be OK, except
that the MTU given by a 'netstat -in' on device ppp0 is set to 0.
-- Alain Mellan <firstname.lastname@example.org>
3.9 use MacPPP 2.0.1 on non-US System 6 Macintoshes
The current MacPPP Version (2.0.1) works on System 6 only if the system
folder is called "System Folder". On non-US systems (e.g. German
systems, where it is called "Systemordner"), MacPPP doesn't find some
file it needs. On System 7 Macs this problem isn't there.
The workaround is, to rename the system folder to "System Folder". Other
programs will ask the system, how the system folder is named, and
continue to work.
Thanks to email@example.com (Peter Koch) for summarizing
this information to me, who never used a Macintosh (with the exception
of playing Shufflepack Café once).
3.10 stop MacPPP to automagically dial without being asked to
In article <x@y>, somebody@somewhere wrote:
> MacPPP is launching when I boot up my Mac. I've checked the 'Startup
> items' folder and it's not in there. Does anyone know why?
A couple of things to check for are 1) some of the snmp agents will
cause macppp (at least older versions) to try and dial up the selected
server - the solution is to disable the snmp manager extension. 2) you
might have network time selected to set the clock at boot up - turn off
this option and instead set it for once an hour or something like that.
firstname.lastname@example.org (David Comay)
Anything that opens the IP driver will cause MacPPP to dial up it's
target. Particularly you will see this problem with ZapTCP. It will open
the IP driver at boot time, as well as everytime a program quits.
Tom Kimpton <email@example.com>
Unsolicited junk e-mail will be proofread at US$50.- per page. By sending
such e-mail to my address, you accept these terms.