Question

RRAS VPN - user can only see VPN serving machine after connecting?

Asked by: rberman

I have a Routing & Remote Access VPN on a W2K server that's been up and fine for years. Generally, I VPN in from various places using the standard Windows client on XP or Vista, and usually then remote-desktop into various systems on that remote LAN.

I have another user I'd like to have access in the same way, but she can only see and access the Win2K serer after connecting through the VPN - no other system on the LAN even responds to ping for her.

I seem to recall a few years ago I had a contractor who I gave exactly that kind of access to - to see the server only, but I don't recall how I did that. But in any case, now I want this user to have the same access that I do, but under her own login credentials of course.

I have a single remote access policy - membership in a group - and she is a member of that group. I have tried giving her administrators group as well (since I have that) but that changed nothing for her LAN access.

I've checked input/output filtering, and there's nothing there about per-user or per-group access (it is just IP, port and protocols filtering anyway).

She is using Vista32 on a laptop - same as I am. She connects and authenticates without a problem. There is no external routing firewall between this server and the LAN. There is no filtering on the LAN interface on the W2K server. She authenticates and is given an IP in the LAN address range (I've checked by looking at the Remote Access Clients in RRAS manager). Note that this is not an AD setup, just a basic MS LAN with a couple of servers and about 6 workstations.

So the question could be asked: If you wanted to give a user VPN access through RRAS and wanted to limit them to just the RRAS server itself for LAN visibility, how would you do it? Or how might I UNDO it?

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Asked On
2009-09-18 at 08:34:36ID24743612
Tags

routing vpn lan network security

Topics

Windows Networking

,

Windows 2000 Server

,

Virtual Private Networking (VPN)

Participating Experts
2
Points
125
Comments
8

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Answers

 

by: RobWillPosted on 2009-09-20 at 18:12:19ID: 25379732

The most common cause of this is the site from which the user is connecting is using the same local subnet as the VPN server, such as both sites using an address like 192.168.1.x.
If the client disables in their VPN connection "use remote default gateway" they will not even be able to connect to the VPN server. The subnets MUST be different or routing cannot take place.

 

by: rbermanPosted on 2009-09-20 at 18:35:54ID: 25379794

right. That isn't the case here, as the LAN uses 192.168.0 just to be different from the norm. Since then, we've found that the problem is name resolution. By using the IP address of the machine on the LAN that she needs to reach, she has no problem.

So I'm going to leave this open for the next phase of this - how to get remote name resolution to travel over the VPN, so that (for example) typing "ping <name>" will work. For more info, we do not run either DHNS or windows name services on the LAN (and really don't want to) and, as mentioned about, it is not a domain - it is a simple LAN. Name resolution works fine through the usual peer-to-peer mechanisms on the LAN - can these same mechanisms route?

 

by: RobWillPosted on 2009-09-20 at 18:38:28ID: 25379801

 

by: QlemoPosted on 2009-09-27 at 05:38:47ID: 25433833

In most such cases, using a local Host/LMHosts (if few PCs) or WINS on RRAS server is working best (as shown in above Blog) The WINS server setting is exchanged with VPN only, so if not connected it does not disturb the DNS resolution for Internet traffic.

 

by: rbermanPosted on 2009-09-27 at 08:43:36ID: 31630631

The only reason this is not an "A" is that when referring to assigning DNS or WINS servers you say "to the RRAS server's network adapter". Of course the typical and recommended configuration for the RRAS is to use two separate network adapters, and this doesn't say which to assign.

 

by: QlemoPosted on 2009-09-27 at 09:42:48ID: 25434494

The "two NIC for RRAS" rule is (if ever) appliable only to servers with a public interface. Nowadays, this is never done anymore, as you have affordable routing/firewall devices for Internet access. There is absolutely no need for a second NIC in such cases.  I reckon it is the same for you.

 

by: rbermanPosted on 2009-09-27 at 10:11:23ID: 25434603

Reckon away -- the server has a public interface. There ya go.

 

by: QlemoPosted on 2009-09-27 at 13:27:17ID: 25435347

Got me ...

20120131-EE-VQP-002

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