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Join networks over VPN

Posted on 2011-02-22
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Last Modified: 2012-05-11
Hi,

I have 2 small remote networks with a server at both locations. Site 1 has had a server for some time and all works fine. I have setup a second server at Site 2 and have created a PPTP VPN to the server at Site 1. This works fine and I can ping all the computers on the remote network (site 1) from Site 2.

However is it possible for my computers on the remote network at Site 2 to also ping the computers at Site 1 VIA the vpn on the local server?
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Question by:amgrobins
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9 Comments
 

Author Comment

by:amgrobins
ID: 34951398
I should add that my server at Site 2 is acting as DHCP.

Server ip 192.168.0.2
Scope 192.168.0.150-192.168.0.200
DNS 192.168.0.2
WINS 192.168.0.2
Gateway 192.168.0.1 (my dsl router)
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LVL 78

Expert Comment

by:arnold
ID: 34951873
Yes, you would need to configure the server at site 2 as a router routing and remote access)
Make sure the other side does not use the same ip block.

In the current setup, site2's systems will be able to access site1's, but not the reverse except for the responses..
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Author Comment

by:amgrobins
ID: 34951919
OK im setting up RRAS for demand dial at the moment. I have got as far as setting up a static route to initiate the demand dial.

It needs a destination ip which is 192.168.1.1 (site 1 server ip) but its also asking for a network mask: i tried 255.255.255.0 but it says thats invalid. It also needs a metric?

site 1 range is 192.168.1.x
site 2 range is 192.168.0.x
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LVL 78

Expert Comment

by:arnold
ID: 34952825
The mask should be 255.255.255.255 since you are pinging a host.

Use 50 for the metric.
Metric will be used to arbitrate between similar paths.

The larger the metroic number the lower the preference.
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Author Comment

by:amgrobins
ID: 34952877
OK i setup a demand dial with the static route of 192.168.1.0 / 255.255.255.255 / 50. I made it persistent and connected. It connected fine and I can see on the other server that is is connected but i still cant ping site 1 server (192.168.1.1) from site 2 server (192.168.0.2) when the demand dial connection is made.
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Author Comment

by:amgrobins
ID: 34953000
here is my routing table on the local network adapter of site 2 server.
It seems to me that the gateway for 192.168.1.19 should be .1 and not .15?? Is this right and how do i change that?


Untitled.png
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LVL 78

Expert Comment

by:arnold
ID: 34954166
You are missing a route
192.168.1.0 255.255.255.0 192.168.1.15
192.168.1.19 is the Site 1 server?

192.168.1.1 is likely your router on the other side and site 1 might not have been configured to NAT the PPTP connection.
 
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Author Comment

by:amgrobins
ID: 34954183
Site 1:

Server 192.168.1.1
Router 192.168.1.3


Site 2:

Server 192.168.0.2
Router 192.168.0.1


I think .19 is the IP thats been given by DHCP to the VPN connection?

How can i configure Site 1 to NAT the PPTP conn?
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Accepted Solution

by:
arnold earned 500 total points
ID: 34954935
This is part of the PPTP server configuration.

what is the 192.168.1.15 IP then?

If you want to access the remote site , you need to make sure that both sides function as routers.

The inter LAN IP should be different from the LAN.

http://support.microsoft.com/kb/323441

L2TP might be a better choice to setup site to site type of VPN, but would require some adjustments on your network.
 
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