Re: W2K VPN - Problems using a single server

Bill,

Thanks for all of your help. I set it up as a Remote Access Server with one
NIC. I had the router do port forwarding on 1723 and allowed all access for
the GRE protocol. We are now up and running.

Thanks again

"Bill Grant" wrote:

> All data packets sent over a pptp connection are encrypted and
> encapsulated. The encapsulation used is a modified GRE header. If you block
> GRE anywhere, these packets are blocked so you get zero bytes of data
> transferred and the connection closes. Allowing the GRE protocol allows the
> encrypted data to pass. It does not allow anything else.
>
> Nick wrote:
> > Okay, I see what you are talking about now. So would this take the GRE
> > protocol out of the equation? Is this still secure?
> >
> > Thanks,
> >
> > Nick
> >
> > "Bill Grant" wrote:
> >
> >> In addition to what Bob Lin said (ie don't use two NICs), do not
> >> use the VPN server option in the wizard. This should only be used if
> >> the server is a VPN server ONLY. It sets up filters to block all
> >> non-VPN traffic (hence your LAN problem).
> >>
> >> Here is the procedure I would recommend. Configure your server
> >> for remote access with just one NIC. (This sets up the WAN miniports
> >> for VPN). Make sure you can make a VPN connection to your server
> >> from a LAN client. Check that the router is forwarding tcp port 1723
> >> to the RRAS server's private IP.Then try making a VPN connection
> >> from a remote client via the router (ie using the router's public
> >> IP).
> >>
> >> Port 47 (TCP or UDP) has nothing to do with VPN. What a PPTP
> >> connection does require is GRE, which is IP protocol 47. If your
> >> router (or anything else in the path) blocks GRE, your connection
> >> will fail, probably with an error 721.
> >>
> >> Nick wrote:
> >>> We have one file server. We would like to be able to access it
> >>> remotely via VPN but also allow it to perform its general file
> >>> sharing services on our LAN. We have a DSL line provided by our
> >>> Telco which also provides the router (configured and maintained by
> >>> them). I have been reading numerous articles and they all suggest
> >>> having one server for VPN and additional servers for various other
> >>> functions. Financially this is not possible with our organization.
> >>> Our Telco's router is plugged into our switch as is our server. The
> >>> gateway for our workstations and the server is the interal IP of
> >>> the router. We are not running active directory so we don't have
> >>> DNS or WINS setup on the server. Our network scheme is 192.168.0.x.
> >>> Here is what I have tried so far on our server:
> >>>
> >>> Installed an additional NIC. The original NIC had an IP address of
> >>> 192.168.0.254. The additional NIC was configured with an IP address
> >>> of 192.168.0.253. I ran the Routing and Remote Access wizard and
> >>> configured the VPN server to use the addtional NIC. I called our
> >>> Telco and asked them to configure the router so when someone hits
> >>> the public IP of the router using port 1723 it forwards that to the
> >>> internal address of 192.168.0.253. They said they understood what I
> >>> was wanting to do and also set up port 47 for GRE. When I plugged
> >>> the additional NIC into our switch no one could access the server
> >>> from the LAN. It immediately dropped all of the active connections.
> >>>
> >>> Can I setup a single server to perform both functions and will it
> >>> work in our situation where we go through a switch to connect to the
> >>> router. What should I tell our Telco in order to make this work? I
> >>> have read that possible configuring the additional NIC with the
> >>> public IP of the router may help. If so what needs to be done? We
> >>> are willing to try just about anything at this point.
> >>>
> >>> Thanks in advance.
>
>
>
.

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