https://support.software.dell.com/kb/sw7759

UTM - VPN: How to configure NAT over VPN in a site to site VPN with overlapping networks (KB Article and Video Tutorial) (SW7759)

Title
UTM - VPN: How to configure NAT over VPN in a site to site VPN with overlapping networks (KB Article and Video Tutorial)
Resolution

Article Applies To:

Affected SonicWALL Security Appliance Platforms:

Gen6 SM E10000 series: NSA E10800, NSA E10400, NSA E10200, NSA E10100
Gen6 SM 9000 series: NSA 9600, NSA 9400, NSA 9200
Gen6 NSA Series: NSA 6600, NSA 5600, NSA 4600, NSA 3600, NSA 2600

Gen5: NSA E8510, E8500, E7500, NSA E6500, NSA E5500, NSA 5000, NSA 4500, NSA 3500, NSA 2400, NSA 2400MX, NSA 220, NSA 220W NSA 240, NSA 250M, NSA250MW
Gen5 TZ series: TZ 100, TZ 100W, TZ 105, TZ 105W TZ 200, TZ 200W, TZ 205, TZ 205W TZ 210, TZ 210W,TZ 215, TZ 215W.
Gen4: PRO series: PRO 5060, PRO 4100, PRO 4060,PRO 3060, PRO 2040, PRO 1260
Gen4: TZ series: TZ 190, TZ 190 W, TZ 180, TZ 180 W, TZ 170, TZ 170 W, TZ 170 SP, TZ 170 SP Wireless

Firmware/Software Version: All SonicOS Enhanced firmware versions.
Services: VPN

To watch a video tutorial on this topic, click here

http://bcove.me/9avfus6v



Feature/Application:

A VPN tunnel cannot be established if both the destination network and the local network have the same subnets. The Apply NAT Policies feature or NAT over VPN is configured when both sides of a proposed site to site VPN configuration have identical, and hence overlapping, subnets.

For diagrams:

https://support.software.dell.com/kb/sw7759

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