[pptp-server] ppp remote user

Gord Belsey gord at amador.ca
Fri May 5 10:28:56 CDT 2000 

What Jean-serge is suggesting makes sense to me.  If you add routes on C for
all the networks A could potentially be on, you'll always be able to ping A
when it's connected to B.

A appears to be an Internet box.  Let's say that A can be assigned any
address in the 162.162.1.1 through 162.162.1.254.  If you add a route to C
like this:

route add -net 162.162.1.0 netmask 255.255.255.0 gw <B's ip address>

C will reach A through B. Therefore, you can ping to A, once you know it's
address.  As an added bonus if now or at some future time you'll have
multiple A's, that is, more than one device connecting to B and requireing
access to C, this route statement takes care of them as well.  I'm assuming
that B gives A it's address, and assigns addresses from a single subnet. If
it's possible for A to have an address from more than one subnet, you'll
need a route statement for each subnet, or a single broader statement.
Using my first example, let's say that A can be assigned any address in the
162.162.1.1 through 162.162.2.254

You can add 2 route statements covering 162.162.1.0 and 162.162.2.0:

route add -net 162.162.1.0 netmask 255.255.255.0 gw <B's ip address>
and
route add -net 162.162.2.0 netmask 255.255.255.0 gw <B's ip address>

Just keep in mind that the route statment should match the intended subnet.
So if the subnet were, say, 162.162.1.0/255.255.255.128, use that same mask
in the route statment. That should keep you from getting tripped up later,
say, if C needs to talk to the subnet 162.162.1.128/255.255.255.128 and that
subnet ISN'T connected to B.

Hopefully, this helps you with your situation.

Good luck

Gord Belsey



----- Original Message -----
From: Jean-Serge Gagnon <jsg at newlix.com>
To: Dung Nguyen <nhdung at yahoo.com>; Gord Belsey <gord at amador.ca>
Cc: <pptp-server at lists.schulte.org>
Sent: Friday, May 05, 2000 5:59 AM
Subject: RE: [pptp-server] ppp remote user


> The only thing I can think of is permanently adding routes from C to all
> possible addresses that A may get. This should usually never change and
> could be as easy as a network address range. If you control the setup of
B,
> then it should not be difficult and even when A is not connected, there is
> no harm (correct me if I'm wrong) in having the route there on C...
>
> Jean-Serge Gagnon - Applications Director
> Newlix Corporation - jsg at newlix.com
> http://www.newlix.com
> (613) 225-0516 fax: (613) 225-5625
>
> > -----Original Message-----
> > From: pptp-server-admin at lists.schulte.org
> > [mailto:pptp-server-admin at lists.schulte.org]On Behalf Of Dung Nguyen
> > Sent: Friday, May 05, 2000 3:30 AM
> > To: Gord Belsey
> > Cc: pptp-server at lists.schulte.org
> > Subject: Re: [pptp-server] ppp remote user
> >
> >
> > Dear
> > Thank you for your helping me.I understand you, but I
> > want to mean that :
> >  ----- ------- ------
> > |  A |----------|  B  |------------------| C  |
> >  ----- PPP ------- pptp ------
> >
> >
> > And these are things I've done :
> > _ I establish a ppp connection from A to B
> > _ After that I make a pptp connection manually from B
> > (pptp linux-Client) to C (PoPToP linux Server)
> >
> > _ After that I can't ping from C to A
> > _ If i do manually : route add -net <address A> gw
> > <Address B> at C(PoPToP Server) : I can ping to Remote
> > host A
> > _ My question is how to ping from C to A automatically
> > because We don't know the dynamic address of the
> > remote host A (Is assgined by B), so I can't add to
> > ip-up.local scripts.
> > If you have time , Please help me.
> > Thank you very much.
> >
> >
> > --- Gord Belsey <gord at amador.ca> wrote:
> > > For adding the route to the client, you can set up
> > > an ip-up.local file in
> > > /etc/ppp.  ppp runs /etc/ppp/ip-up when it brins up
> > > a ppp connection.  ip-up
> > > will run ip-up.local if it exists (and proper
> > > permissions are set....I
> > > tripped over that one on my first set up:o).
> > >
> > > In /etc/ppp/ip-up.local add the following line :
> > >
> > >  route add -net $3 gw $4
> > >
> > > ppp passes information via $1 through $5 as well as
> > > some other variables
> > > suchas $PEERNAME.  There is also $6 which you can
> > > give a value in the
> > > /etc/ppp/options file.  In the above route
> > > statement, $3 is the remote
> > > clients address and $4 is the local address for the
> > > ppp connection,aka
> > > gateway.
> > >
> > > This is a pretty basic route statement which works
> > > fine for a single client
> > > connection.  If the client was a linux box with a
> > > LAN behind it (acting as a
> > > router) the route statement would be more complex
> > > (this is how I'm set up).
> > >
> > > On the second point, I'm guessing it's a windows
> > > client connecting to the
> > > PoPToP server.  Assuming this is true, on the
> > > windows network setup, select
> > > the option for using the remote (server) default
> > > route.  That lets the
> > > windows client use the PoPToP server as it's gateway
> > > to "anywhere".  If this
> > > is a linux client, you can set up routing using the
> > > ip-up.local example
> > > above.
> > >
> > > Hope this is helpful.
> > >
> > > Gord Belsey
> > > ----- Original Message -----
> > > From: Dung Nguyen <nhdung at yahoo.com>
> > > To: <pptp-server at lists.schulte.org>
> > > Sent: Thursday, May 04, 2000 4:24 AM
> > > Subject: [pptp-server] ppp remote user
> > >
> > >
> > > > Dear all
> > > > I am a newer for this mailing list. I am very
> > > > interested in PoPToP and i've got some things
> > > > successfully, but now i have a problem :
> > > >
> > > > ppp Client pptp Client pptpd server
> > > > ------- --------- ---------
> > > > |     |-------- | |-------------- | |
> > > > ------- ppp ---------     pptp ---------
> > > > 192.168.1.2 192.168.1.3 192.168.1.4
> > > >
> > > > My problem is I can't ping from the PPP Client to
> > > PPTP
> > > > Server, although the subnet is the same. If I do
> > > > manually :
> > > > route add -net 192.168.1.2 gw 192.168.1.3
> > > > on the pptp server. I can ping to the remote ppp
> > > > Client.
> > > > If Anyone can help me to do that automatically ? I
> > > > think that the problem is how to know the address
> > > of
> > > > the remote ppp client.
> > > > Thanks a lot
> > > > Dung Nguyen
> > > >
> > > >
> > > > __________________________________________________
> > > > Do You Yahoo!?
> > > > Send instant messages & get email alerts with
> > > Yahoo! Messenger.
> > > > http://im.yahoo.com/
> > > > _______________________________________________
> > > > pptp-server maillist  -
> > > pptp-server at lists.schulte.org
> > > >
> > >
> > http://lists.schulte.org/mailman/listinfo/pptp-server
> > > > List services provided by www.schulte.org!
> > > >
> > >
> > > _______________________________________________
> > > pptp-server maillist  -
> > > pptp-server at lists.schulte.org
> > >
> > http://lists.schulte.org/mailman/listinfo/pptp-server
> > > List services provided by www.schulte.org!
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Send instant messages & get email alerts with Yahoo! Messenger.
> > http://im.yahoo.com/
> > _______________________________________________
> > pptp-server maillist  -  pptp-server at lists.schulte.org
> > http://lists.schulte.org/mailman/listinfo/pptp-server
> > List services provided by www.schulte.org!
> >
>
> _______________________________________________
> pptp-server maillist  -  pptp-server at lists.schulte.org
> http://lists.schulte.org/mailman/listinfo/pptp-server
> List services provided by www.schulte.org!

More information about the pptp-server mailing list