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Cannot access resources after establishing the VPN because of the same IP

Situation: The client setup VPN on his XP Pro ad he can establish the VPN, but he can't ping the VPN host by IP.

Troubleshooting: 1. The ipconfig /all shows the both VPN host and VPN client are using the same IP 192.168.0.2.

2. The VPN host setup to "Assign TCP/IP addresses automatically using DHCP".

3. The DHCP is Netgear RO318 router.

Analysis and resolution: in most cases, the XP can not be Netgear DHCP relay to assign IP to the VPN client. Therefore, both VPN server and client use the same IP address. To solve this issue, setup Incoming TCP/IP Properties to "Specify the TCP/IP addresses: or "Allow calling computer to specify its own IP address". If you select "Allow calling computer to specify its own IP address", you  need to assign IP on the VPN client and make sure the IP is in the same subnet as the host.

Refer to case #: JB071806

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