[pptp-server] strange problem...

[Mikael Lönnroth]

Ah ok, I found a problem that didn't even exist :)

By default, I think, Windows 98 will route ALL your traffic through the PPTP
connection. That is, when you try to browse the Internet (and before that,
resolve some DNS address to an IP address), all these actions are routed

    *your computer* >> *VPN server* >> *Internet*

    and not

    *your computer* >> *Internet*

There are two solutions to this problem (I hope I got the problem right this
time):

1) Uncheck the "Use default gateway on remote network" checkbox. Should be
somewhere close to the TCP/IP settings on your VPN Dial-up properties.

or

2) Allow your VPN server to forward (and probably masquerade) your traffic
also to the public Internet (also, company firewalls should allow this)

If you use option 1, you might have to manually insert a routing entry for
your company network using the "route" tool.

Regards,
Mikael Lönnroth
www.advancevpn.com



----- Original Message -----
From: "Timothy Findlay" <timothy.findlay at austrimtextiles.com.au>
To: <mikael.lonnroth at advancevpn.com>
Cc: <pptp-server at lists.schulte.org>
Sent: Friday, January 04, 2002 12:49 AM
Subject: Re: [pptp-server] strange problem...


> Hi,
>
> Sorry, I think I missed the point explaining the problem, from the laptop,
> stage 1 (Internet connection) initially appears ok, then if we goto stage
2
> (open the VPN to the office) it works great... and we can stay connected
to
> the VPN for however many hours without a problem, the issue is if we open
> stage 1 (Internet connection) and then open a web browser to look around
> the web (forgetting about the VPN to the office) it doesn't go anywhere!
>
> It's almost like the dialup internet connection expects a VPN connection,
> and wont do anything by itself. It's not actually the VPN part that is
> faulty, its the Internet part.
>
> The crazy part is it was working fine before I installed the VPN support
in
> Win98, after the Internet+VPN works, but not just Internet.
>
> Does that make any sense ??
>
> Thanks anyway tho,
> Tim.
>
> > Hi there,
> >
> > This is also just guessing, but I have notice that something like this
> > can happen when you use several PPTP clients behind a NAT router.
> >
> > Briefly, when you connect your first client everything works nicely.
> > When the second client connects, the actual connection can be
> > established ok but after this no data seems to go through (at least for
> > the second client) .
> >
> > To the VPN server, the first client has sent a number of GRE packets,
> > and now the second client starts sending packets using the same source
> > IP address (because it is natted), but with new packet order numbers.
> > The VPN server can't distinguish between the connections... and things
> > fail...
> >
> > Well, like I said, this is just guessing.
> >
> > Regards,
> > Mikael Lönnroth
> > www.advancevpn.com <http://www.advancevpn.com>
> >
> >
> > ----- Original Message -----
> > From: Timothy Findlay <mailto:Timothy.Findlay at austrimtextiles.com.au>
> > To: 'pptp-server at lists.schulte.org'
> > <mailto:'pptp-server at lists.schulte.org'>
> > Sent: Thursday, January 03, 2002 2:46 PM
> > Subject: [pptp-server] strange problem...
> >
> >
> > Hi,
> >
> > I know this proberly isn't the right place for this question, but not
> > quite sure where to go with it.
> >
> > I've installed PPTPD on a hacked up RH 7.1 box and the clients connect
> > to it fine (works like a charm!). However with 2-3 laptops(running
> > Win98 SE), after installing the Microsoft VPN Adapter (which works
> > cool) regular internet connections bugger up. When we dial Joe Bloggs
> > service provider (which used to work fine) it connects, authenticates,
> > looks fine, but when we fire up a web browser it only transfers a tiny
> > bit of information and then stops.
> >
> > It's almost like it disables the connection, no pings or traceroutes
> > work after been connected to the provider for more than say 10-15
> > seconds.
> >
> > I'm wondering if adding the VPN support (in the Add/Remove Windows
> > bits) is overwriting some file somewhere in windows for the TCP/IP
> > stack or something.... but I just dont know, most systems work fine
> > after adding the VPN stuff, but only these 2-3 Acer laptops seem to
> > bugger up.
> >
> > Any thoughts ?? Anything I should be looking at ??
> >
> > Thanks,
> > Tim.
>
>
>
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