You need to connect using VPN connection to remote client site and realize that you both using same IP subnet. You connect fine but can't access any resources on the remote subnet. Some people may suggest you to change one of the subnet, but you can't do that because both of subnet are office environment.
Cause:
It's network and route thing. Your PC think the remote IP is locally.
Solution:
You need to manually add routing for remote IP at your PC. You can do that using command ROUTE.
1. Connect to VPN site.
2. From command prompt run ROUTE PRINT to show status. In my case:
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 11 09 26 33 75 ...... VIA Rhine II Fast Ethernet Adapter - Packet Scheduler Miniport
0x60004 ...00 53 45 00 00 00 ...... WAN (PPP/SLIP) Interface
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.10.10.1 10.10.10.9 21
0.0.0.0 0.0.0.0 10.10.10.79 10.10.10.79 1
10.10.8.0 255.255.252.0 10.10.10.9 10.10.10.9 20
10.10.10.9 255.255.255.255 127.0.0.1 127.0.0.1 20
10.10.10.79 255.255.255.255 127.0.0.1 127.0.0.1 50
10.255.255.255 255.255.255.255 10.10.10.9 10.10.10.9 20
10.255.255.255 255.255.255.255 10.10.10.79 10.10.10.79 50
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
2xx.2xx.2xx.2xx 255.255.255.255 10.10.10.1 10.10.10.9 20
224.0.0.0 240.0.0.0 10.10.10.9 10.10.10.9 20
224.0.0.0 240.0.0.0 10.10.10.79 10.10.10.79 1
255.255.255.255 255.255.255.255 10.10.10.9 10.10.10.9 1
255.255.255.255 255.255.255.255 10.10.10.79 10.10.10.79 1
Default Gateway: 10.10.10.79
===========================================================================
Persistent Routes:
None
3. From here, we get information:
- 10.10.10.9 my current IP
- 10.10.10.79 my assigned VPN IP
- 0x60004 my VPN interface
- 2xx.2xx.2xx.2xx I need to hide my client public IP
4. To manually add route run:
ROUTE ADD <TargetIP> MASK <Mask> <GatewayIP> METRIC <Metric> IF <InterfaceID>
so for my case if I want to add route to single IP 10.10.10.18 on remote site:
ROUTE ADD 10.10.10.18 MASK 255.255.255.255 10.10.10.79 METRIC 1 IF 0x6004
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 11 09 26 33 75 ...... VIA Rhine II Fast Ethernet Adapter - Packet Scheduler Miniport
0x60004 ...00 53 45 00 00 00 ...... WAN (PPP/SLIP) Interface
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.10.10.1 10.10.10.9 21
0.0.0.0 0.0.0.0 10.10.10.79 10.10.10.79 1
10.10.8.0 255.255.252.0 10.10.10.9 10.10.10.9 20
10.10.10.9 255.255.255.255 127.0.0.1 127.0.0.1 20
10.10.10.18 255.255.255.255 10.10.10.79 10.10.10.79 1
10.10.10.79 255.255.255.255 127.0.0.1 127.0.0.1 50
10.255.255.255 255.255.255.255 10.10.10.9 10.10.10.9 20
10.255.255.255 255.255.255.255 10.10.10.79 10.10.10.79 50
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
2xx.2xx.2xx.2xx 255.255.255.255 10.10.10.1 10.10.10.9 20
224.0.0.0 240.0.0.0 10.10.10.9 10.10.10.9 20
224.0.0.0 240.0.0.0 10.10.10.79 10.10.10.79 1
255.255.255.255 255.255.255.255 10.10.10.9 10.10.10.9 1
255.255.255.255 255.255.255.255 10.10.10.79 10.10.10.79 1
Default Gateway: 10.10.10.79
===========================================================================
Persistent Routes:
None
Or You can use Portable GUI Application NetRouteView from nirsoft.net to show and manipulating your windows routing table.
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