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Troubleshoot IP Address Conflicts on the RV016, RV042, RV042G and RV082 VPN Routers

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Sat, 07/09/2016 - 08:30
Apr 26th, 2016
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Cisco Support Community

Article ID: 321

Objective

An IP address conflict error is experienced if there is an identical IP address between your computer and another computer in the network. This usually occurs when a computer or network device has a static IP address and it created a conflict with the IP address released by the DHCP server which in this case is the RV Wired Router. This article explains how to troubleshoot this issue on the RV016, RV042, RV042G and RV082 VPN Routers.

Applicable Devices

• RV016
• RV042
• RV042G
• RV082

Software Version

• v4.2.1.02

Troubleshoot IP Address Conflict

The RV Wired Routers Series offers DHCP capabilities. DHCP assigns IP addresses to members of the network automatically. On the RV Wired router, a range of addresses is set and those address are given randomly to members of the network. When there is an IP address conflict, that means two end users have the same address, with one of the users having a static IP address, and the other having a dynamic IP address. To solve this issue, follow the next steps.

Static Routing

Step 1. Log in to the Router configuration utility and choose Setup > Advanced Routing. The Advanced Routing page opens:

Step 2. Check the network IP addresses under Static Routing, that have been assigned in the LAN in order to determine which IP addresses you cannot use in your dynamic IP address range.

DHCP Setup

Configuration of dynamic IP addresses needs the DHCP configuration.

Step 1. Log in to the Router configuration utility and choose DHCP > DHCP Setup. The DHCP Setup page opens:

Note: Under Dynamic IP, a range of addresses is given. The best solution is to give a new range of IP addresses. This way, new IP addresses are assigned to the users in the network, which ends the current IP address conflict.

Step 2. In the Dynamic IP area, enter a new start IP address for the range in the Range Start field. The Dynamic IP range is the range of IPs that DHCP is allowed to use.

Step 3. Enter a new end IP address for the range in the Range End field.

Step 4. Click Save to save all the changes made on the DHCP Setup.

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