# Failed to Add a Router in OpUtils - Not a Router

## Problem

When you try to add a router in **Switch Port Mapper**, **Rogue Detection**, and **MAC IP List** tools or from **Admin --> Add Routers**, you get an error as **"Not a Router"**.

## Cause

The following checks are performed when a router is added in OpUtils:

1. Whether the device responds to SNMP for the given community string.
2. Whether the device has the forwarding capability. For a device to qualify as a router, its IP Forwarding should be set to **"Forwarding"**. This is checked by querying the OID:  
   `. 1.3.6.1 .2.1.4.1.0`  
   This should return **1**, if it is a router or a gateway server. When this returns **2**, it means that it is not forwarding and you will get this error message.

## More Information

OpUtils periodically queries these routers/gateway servers to get the MAC-IP data of the devices in the network. This data will be used to detect new MAC addresses or to resolve the IP from MAC.

**Applies to:** Rogue Detection, Switch Port Mapper, MAC IP List  

**Keywords:** not a router, not forwarding, ip forwarding, ip-mac details

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