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Error - Index of the interface: Subnet on this interface overlaps with another interface
10/14/2021 
35 People found this article helpful
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Description
In SonicWall when configuring an interface, sometimes there is an error message thrown stating "Error: Index of the interface.: Subnet on this interface overlaps with another interface".
Cause
- For example in the image shown above, the interface X0 (LAN) has a subnet of 192.168.168.0/255.255.255.0, X1 (WAN) has a subnet of 192.168.1.0/255.255.255.0 & W0 (WLAN) has 172.16.31.0/255.255.255.0.
- In SonicWall, more than one interfaces cannot be assigned manually with same IP subnet unless they are bridged in layer 2 bridged mode. (Refer KB ID SW8220 for Layer 2 Bridge Mode configuration)
- While configuring a new interface, we need to use a completely different subnet that are not existing on the other interfaces of SonicWall. If not, the error message will be displayed as shown below in the screenshot.
Resolution
Resolution for SonicOS 6.5
This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.
Step 1: Login to the SonicWall Management GUI.
Step 2: Navigate to the Manage | Network | Interfaces page.
Step 3: Click on configure option of the desired interface e.g. X2.
Step 4: In the X2 interface settings window, provide IP address & subnet mask that are not being used on other interfaces of SonicWall.
Step 5: Click on OK.
Now, we can see X2 interface has been configured with a new IP address which doesn't overlap with any other interface subnets.
Resolution for SonicOS 6.2 and Below
The below resolution is for customers using SonicOS 6.2 and earlier firmware. For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware.
Step 1: Login to the SonicWall Management GUI.
Step 2: Navigate to the Network | Interfaces page.
Step 3: Click on configure option of the desired interface e.g. X2.
Step 4: In the X2 interface settings window, provide IP address & subnet mask that are not being used on other interfaces of SonicWall.
Step 5: Click on OK.
Now, we can see X2 interface has been configured with a new IP address which doesn't overlap with any other interface subnets.
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