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SBS 2003 client VPN Connection using MS CHAP V2 Behind Linksys routers

Posted on 2006-05-14
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I have a Small Business Server 2003 network.  I connect remotely on occasion using the Windows XP VPN Connector.  By default the SBS uses MS-CHAP V2 for authentication.  The VPN connection works fine if I am not behind a Linksys router.  If I am behind a Linksys router and connect with the VPN connection it says that it is connected, but I don't have any connectivity with my SBS network.  I can't ping the server, see any network shares, etc...  It is odd that is even says that it is connected.  This happens with any model of Linksys router I have tried.  

If I am connected directly to the internet of behind a Netgear or D-Link router the VPN connection works fine and I can work as normal.  I can ping the server, see all the shares, etc...

Does anyone know how to get the VPN connection to work properly behind a Linksys router?
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Question by:hitekcomputing
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by:Rob Williams
ID: 16677476
Most of the Linksys need to have VPN pass-through enabled. This is located in different places on different models but you should find a list with check boxes, which are disabled by default:
PPTP pass-through
L2TP pass-through
IPSec pass-trough
Just a note: some old Linksys routers do not support VPN's, and some not so old units require firmware updates to allow VPN pass through. However, if the pass-through list is there, they are compatible.
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by:hitekcomputing
ID: 16679197
I do know that the VPN passthrough needs to be enabled and it is.  However, the default authentication for VPN on SBS is not L2TP, PPTP, or IPSEC.  It is MS-CHAP V2.  That is what I cannot get to work from behind any Linksys router.  It works fine from behind Netgear, D-Link, and other brands.  
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by:Rob Williams
ID: 16687670
Sorry I was thinking IPSec/L2TP. I dug everywhere and could find no reference to Linksys routers supporting MS-Chap V1 or V2, then again none stating they don't. However, it is possible they do not support it.
Though you can configure SBS with MS-CHAP v2, I don't believe it is the default configuration. You could change that and use basic PPTP only, which is supported by Linksys.
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by:hitekcomputing
ID: 16690849
I may have to do that.  How do you configure SBS 2003 to use PPTP.  IS PPTP as sucure?
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Rob Williams earned 1000 total points
ID: 16691033
You can switch it off on the client and server, but I wouldn't do that. Looking at it now, PPTP actually uses MS-CHAP to "communicate.  A Linksys router, unless an old one, will support PPTP without a problem All you should have to do is enable PPTP pass-through on the Linksys. If this option exists on the router then it is VPN/PPTP compatible.

You mention it works when behind a Netgear or D-Link router. Is this on the same network? If not the only reason I can see it working when directly connected to the modem but not when behind the Linksys is if the modem is a combined router and modem and therefore performing NAT (Network Address Translation). The router also performs NAT and VPN's do not like 2 NAT devices. You can verify by going the status page of the Linksys. See what the WAN/Public IP is. If it starts with one of the following:
192.168.x.x
10.x.x.x
172.16-31.x.x
it is behind a NAT modem. The modem in that case would have to re-configured from NAT mode to Bridge mode. If unsure please provide the make and model of the modem and I can get the specifications.
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by:Rob Williams
ID: 16910746
hitekcomputing, were you able to get this working properly?
--Rob
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