Discover how a duplicate IP on your network can range from causing issues for a single user to orphaning an entire subnet. Greg explores symptoms a single user might experience. Observe how a network reacts when a default gateway is duplicated. Learn how to diagnose a duplicate IP, track down the offender, then quickly mitigate them.
- [Narrator] Having duplicate IPs on your network…is a very vexing problem.…They can be trouble shot fairly easily,…but can also be avoided in some instances.…Symptoms of a duplicate IP can vary.…It often manifests as a user saying…they can't access a resource,…or very intermittent access to something.…Normal trouble shooting would be to…ping the client IP which will, generally, work consistently.…When the client tries to ping out; however,…he will see intermittent responses.…
This asymmetric behavior can be quite perplexing.…In networking, one generally sees the same behavior…to and from a host.…The problem lies in the fact that…since two devices have the same IP…and I ping them from a different subnet,…the router that directly terminates that subnet…will arp for the MAC address of the IP owner.…It doesn't matter which end device responds.…The router will send to one of them…and that device will respond back,…so my pings will always get through.…
From the opposite perspective,…if I'm the end device and I attempt to ping out…
Even if you're rusty on your OSI model knowledge, this course is invaluable if you're having trouble with your network. It offers a clear, practical troubleshooting guide to narrowing down and solving most problems related to network connectivity.
- Troubleshooting the physical layer: POTS, Ethernet, and more
- Troubleshooting the data link layer
- Troubleshooting the network layer
- Troubleshooting the transport layer
- Troubleshooting Wi-Fi
- Troubleshooting proactively