[pptp-server] Arp Problems? (no data transfer to other hosts on servers subnet)

[Matt Stockdale]

My apologies, I will try to clear this up.

My linux box connects to a Cisco ISDN router at work. That router only
supplies me 1 IP address. so, to make use of the other machines on my
home network (the 98 Box, A Laptop, and 2 SparcStations) I run IP
Masquerading. The IP address supplied (for the ISDN link) is a one of
the reserved private network addresses, 172.27.x.x. The other machines
on my network use 192.168.1.x addresses, which do not get routed over
the ISDN.

The Cisco ISDN router is in the Core of my work network. We use all
reserved addresses, with the
exception of the gateway machines, which run a HTTP caching proxy
(Squid), Sendmail, and a Socks5
proxy server. These gateway machines each have 2 ethernet cards, one
that connects to our core network, and another that connects to our
Class C on the internet. Our internal routers have no path to the
internet, but can talk to each of the gateway machines. I installed the
PPTP server on one of these gateway machines.

tmk wrote:
> 
> This is sort of confusing to me, but here's the impression i get:
> 
> you have a windows box on teh same ethernet wire as a linux box, and the
> linux box has an isdn line that connects to your work network, which in
> turn connects to the internet somehow.
> 
> first off, i don't think you need masqing at all. You might need to add
> routes to the routing table (linux box)to get your computer to see
> everything. Be sure to tell your windows machine the default gateway that
> goes out to the internet.
> 
> Just FYI, windows has the nasty habit of sending everything through the
> vpn link regardless of the routing table you have set up at home, so if
> you connect to the pptp server with tcp, tcp will only work on that link.
> 
> Kevin
> 
> On Fri, 10 Sep 1999, Matt Stockdale wrote:
> 
> > I downloaded and installed the latest version of poptop on one of my
> > internet gateway machines. I am trying to connect to it from home.. I
> > have an interesting situation where I am attempting to use the MS VPN
> > client to actually get _out_ of a protected network. I have a RH linux
> > 5.2 box at home that
> > connects to work via ISDN. I have a Win98 box connected to my home linux
> > box via ethernet. I have the VPN masq patches in place on the linux box.
> > I places the PPTP server on a dual homed machine that has access to both
> > our internal network (reserved addresses 172.27.0.0) and our internet
> > feed. The VPN client connects fine, and the PPTP server (masq) can ping
> > it, accept telnets from it, etc, just fine.
> > the problem is, once I connect the VPN client on my windows box I can't
> > connect to anything else but masq.
> >
> > I have tried having the PPTP server assign both it's own internet
> > address and a spare internet address, and a 2nd spare internet address
> > is assigned to the VPN client. logging into our internet router, I
> > cannot ping the VPN IP, but it does show up w/ the same MAC address as
> > the PPTP host when I do a "show arp"..
> >
> > ip_forwarding and proxy_arp is enabled for _all_ interfaces on the PPTP
> > host.
> >
> > I can't seem to find any errors, other that it just plain not working.
> >
> >
> > +----------+             +----------+
> > +-----------+             +-------------+
> > | Win98    |             |RH 5.2    |               |ISDN
> > Server|             |PPTP Server  |
> > | VPN clnt |-------------|masq+vpn  |---------------|
> > |-------------|             |-inet
> > +----------+             +----------+
> > +-----------+             +-------------+
> >
> > connects to           ISDN working                this is actually            can ping VPN
> > pptp server                                       the whole internernal       client
> > fine                                              network
> >
> > Any ideas?
> >
> > Thanks,
> > Matt
> >
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