This is a Canonical Question about solving IPv4 subnet conflicts between a VPN client's local network and one across the VPN link from it.. After connecting to a remote location via OpenVPN, clients try to access a server on a network that exists on a subnet such as 192.0.2.0/24.
This article shows how to configure LAN-to-LAN VPN between two Vigor Routers which use the same local IP range. The problem of building VPN tunnels to another router that uses the same IP range is that there will be two routes to the same IP subnet that conflicts with each other. If neither of them can change the IP subnet, the solution is to translate the local IP to a un-used range for the MX Design: Integrating Non-Meraki VPN into AutoVPN Mar 07, 2019 How to setup SNAT in a VPN tunnel – Zyxel Support Campus EMEA 4. Create your local subnet object and remote subnet object Take care to choose a subnet that is not conflicting with any subnet on yours or the remote site! 5. Both created subnet objects should be selected as your “Local policy” and "Remote policy" in the VPN Connection. 6. Cisco Site to Site VPN - Same Subnet - The Cloud (Internet Dec 04, 2014
Configure Point-to-Site Connection. Next step of this configuration is to configure the point-to-site connection. In here we will define client ip address pool as well. It is for VPN clients. Click on newly created VPN gateway connection. Then in new window click on Point-to-site configuration . After that, click on Configure Now
4. Create your local subnet object and remote subnet object Take care to choose a subnet that is not conflicting with any subnet on yours or the remote site! 5. Both created subnet objects should be selected as your “Local policy” and "Remote policy" in the VPN Connection. 6. Cisco Site to Site VPN - Same Subnet - The Cloud (Internet Dec 04, 2014
! object network OBJ-Site-B subnet 192.168.1.0 255.255.255.0 object network OBJ-Site-B-XLATE subnet 172.16.2.0 255.255.255.0 object network OBJ-Site-A-XLATE subnet 172.16.1.0 255.255.255.0 ! nat (inside,outside) source static OBJ-Site-B OBJ-Site-B-XLATE destination static OBJ-Site-A-XLATE OBJ-Site-A-XLATE! access-list VPN-INTERESTING-TRAFFIC line 1 extended permit ip object OBJ-Site-B …
While ExpressRoute circuit is preferred over Site-to-Site VPN when both routes are the same, Azure will use the longest prefix match to choose the route towards the packet's destination. Configure a Site-to-Site VPN to connect to sites not connected through ExpressRoute