Detect duplicate mac address linux

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Daniel Cassidy.

Daniel Cassidy Daniel Cassidy I haven't found a definitive answer, but here's my thought process, in the hope that it helps: What sort of protocol fits this description? Easy Answer: You may need to be creative to force the packet onto the wire and prevent yourself from responding I'm thinking judicious use of iptables and NAT. Not-so-easy Answers: Adam Liss Adam Liss Thanks for this excellent response.

I will definitely be following up. Hopefully that will help someone else somewhere — but probably not!

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How to Detect Duplicate IP Address in LAN connected to Ubuntu ?

Visit Chat. Related Hot Network Questions. Stack Overflow works best with JavaScript enabled. I noticed that Status Watch app but unfortunately we dont have 3COM switches, we have D-Link switches and I've not been able to find anything on their website that looks like it would help: What I was thinking of doing is mirroring a port and having a PC running Wireshark on the other end of the mirrored port but the problem is I've no idea what I would be looking for in the Wireshark capture..

I agree that duplicated MAC is rare in most Corporate network.


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  8. However; in development environment, especially QA Lab To continue this discussion, please ask a new question. Get answers from your peers along with millions of IT pros who visit Spiceworks. Hi guys, Had a fun day yesterday Cheers Chris. Best Answer. Thai Pepper. Chris Aug 23, at It should also be said that if two devices are ordinarily configured and have the same MAC that neither device will operate correctly. This might also help track down, two independent devices not functioning correctly. When ARP requests go out both will reply, and usually the slowest station back to the listener wins, since they announced ARP last most recently.

    The distance as in number of interlinking switches and speed of ethernet links affects which ARP announcement maybe seen last by each station on the network. Each stations view maybe different due to this, as the observable ARP reply packets as seen from their point of view are ordered differently.

    What Happens when there are duplicate MAC Addresses. How many MAC Addresses can a Switch learn?

    Alternatively; you can use ordinary arp -a to check the MAC is not listed, then ping 1. This is a poor mans arping. Use your enterprise switches to lookup the MAC address and the port it is connected on, follow it back until you hit an access port.

    How to Detect Duplicate IP Address in LAN connected to Ubuntu ?

    Shutdown that port or unplug the device yourself. Then working out what the next device along the chain is on that port ID. Eventually you will get to an access port instead of another switch. See if it is still on the network or has also disappeared indicating it maybe the same physical device.

    What Happens when there are duplicate MAC Addresses. How many MAC Addresses can a Switch learn?

    Now continue to arping for the other device and follow the same procedure until you track the MAC back to the port of the other user. If you do not have enterprise switches then this process comes tedious as you need to physically unplug switch interconnections to split the network in half, check one side, then the other, to narrow down the switches and stations involved. Some switches in security mode will ARP reply to lock-out an unauthorized device on the network. Other sorts of equipment that mess with MACs are load balancers and high availability systems, usually two devices with a physical port each might move a MAC between them to load balance traffic.

    This allows the system sending traffic to them to not case which device is receiving the traffic.



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