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2 Draytek 2600 Routers on Network, how to allow VPN access through both

Posted on 2006-06-05
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Last Modified: 2012-05-05
I have windows Network that Users connect to remotely via the Draytek VPN on Router 1, which works fine.

My problem is that if users connect via VPN on Router 2 they cannot see the network, and can only ping the second Router.

I 'think' I need to do something with Static Routes, but the Draytek manual seems a little thin on the logic behind configuring this.

Network information below....

DHCP is handled by the Windows SBS (10.0.0.9)

Network IP

10.0.0.0
255.255.255.0
Gateway : 10.0.0.253

Router 1
10.0.0.253

Router 2
10.0.0.252

Any ideas on what I need to do ?
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Question by:ubiquitas
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Expert Comment

by:Rob Williams
ID: 16833894
Pretty well guarantee the problem is the fact that both sites are using the same subnet. VPN's to allow for routing, require that both sites use a different subnet, or you will have results exactly as described. Assuming a subnet mask of 255.255.255.0 can you change one or the other sites to 10.0.1.x or similar. If using a subnet mask other than 255.255.255.0 please advise as you will have to choose a different subnet.
No static routes should be necessary unless you have multiple gateways at one or the other sites.
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Author Comment

by:ubiquitas
ID: 16834142
ok, just to clarify. All the details i posted are from Main Office which has 2 routers.

People are dialing in from the following remote offices IP's


Remote Office 1
192.168.1.0
255.255.255.0


Remote Office 2
192.168.10.0
255.255.255.0

If either office connects to Main Office (Router1) all is fine, they can see the network

If either office connects  to Main Office (Router12 )all is NOT fine, they can only ping the router (10.0.0.252)

So, which router do I configure the static router on, and what do I type in ?  I've tried a few things but the draytek Static Router pages shows everying as being empty - confused ?  I am !


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Expert Comment

by:Rob Williams
ID: 16834246
Sorry, I misunderstood.
What is likely happening is the remote user connects to a PC/server through router #1 and the reply is sent back to the default gateway which is router #1, and it works fine. However, when they connect to router #2 the reply is still sent back to the default gateway, which is router #1, and the packet is lost. To remedy this on the PC/Server the clients are connecting to, you can add a static route:
route add -p <remote office subnet>  mask  <subnet mask>  <router's IP)
for example:
route  add  -p  192.168.1.0  mask  255.255.255.0  10.0.0.252
This will force all traffic for office 1 through router #2. However they will not be able to connect to router #1.
Note: you can delete the added route with " route  delete 192.168.1.0"    (-p  makes the route persistent upon reboots)
Your router likely has the option to be able to add a similar route command. Install it on router #1 (the default gateway) to advise it where to send the appropriate traffic.
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Author Comment

by:ubiquitas
ID: 16892642
hmm, ok thanks for that.  Ideally I want users to be able to connect to the network via either router, not forcing office 1 to use router 1 and office 2 to use router 2....
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Accepted Solution

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Rob Williams earned 1500 total points
ID: 16893373
The only real solution to that, would be to add a dual WAN port router and insert it in the network between the Draytek units and the local LAN. It will look after the necessary routing . The Linksys RV042 is one such unit:
http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1123638171618&pagename=Linksys%2FCommon%2FVisitorWrapper
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Author Comment

by:ubiquitas
ID: 16893474
ok , thanks bud
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LVL 78

Expert Comment

by:Rob Williams
ID: 16893556
You are welcome.
Thank you.
--Rob
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