Troubleshooting IP Address Conflicts
IP address conflict is a scenario that occurs due to the assignment of the same IP address to two devices on a network, resulting in disabling of both devices or losing connectivity. Let us look at the steps to troubleshoot this problem:
Step 1: Check for overlapping IP address ranges on DHCP server In case multiple DHCP servers are used, you need to cross-check there are no two servers having the same IP address ranges. If the IP address allocation is static, each IP address assignment needs to be reviewed.
Step 2: Check for Duplicate static IP addresses Reconfiguration of the device or DHCP server is the option when devices are configured with duplicate IP address.
Step 3: Check for conflicting MAC addresses Even after step 1 and 2, no result is produced, you need to find conflicting MAC addresses. Each device has a unique MAC address. Looking for the devices with different MAC addresses and same IP addresses by using Address Resolution Protocol (ARP) will be prove useful in such a scenario.
Step 4: Trace the device location For tracing the location of a device on a network, use switch port management tools so that the switch port can be traced to which the faulty devices are connected.
As it is said widely, prevention is better than the cure, one must always work hard to prevent conflicts in the future.
Tips for conflict prevention are as follows:
- Static assignment of IP addresses must be avoided so that chances of duplicate assignment can be reduced.
- For detection of IP address conflicts, set DHCP server.
- Use multiple DHCP servers, each with its own scope.
- IP address management tools can be used.