and this as you know is not a correct mac address. Now the problem is that I tried to get the Mac Address and I get 02:00:00:00:00. What I wanted to do was to grab the Mac Address of every access point in my school (there is one on each room) and add them with a if statement that could say if (mac address from room 212 = current mac address) then you are near room 212 and that way the app will now where are you located on the school. In this case my school (I am currently on a High School program of computer science) This is my final proyect and I was thinking on making an app. The problem is a constantly changing switching table.Hello, I am trying to create a indoor GPS where it shows the client where to go to. Remember, duplicate MACs are "allowed", as far as any out-of-the-box Ethernet switch is concerned- they just cause a problem that will interrupt network connectivity to each host in question. It is more of a race condition, although I haven't heard it referred to like that before. Collisions are the result of a shared electrical bus. authorization.ģ) Duplicate MACs will not cause collisions. They are similar but the difference is important look up authentication vs. The port security feature of some switches is different that "deauthentication"- it is deauthorization. You mentioned deauthentication in your question. Then, if the switch receives frames from a duplicate MAC on another switchport, it can place that port into a disabled state (shut it down.) The MAC address will be learned dynamically by the switch (like it usually learns MACs), but the difference is that once it is learned, it is bound to that switchport. If you want to use port security options on a managed switch, you can do stuff like only allow 1 MAC address per switchport. Managed switches will give you a warning printed in the console terminal if they detect a duplicate MAC (a MAC that 'exists' on multiple switchports), but by default they won't "do anything" about it AFAIK. Duplicate MAC addresses will not trigger any sort of security problem in an unmanaged switch (a switch without configuration software), or a managed switch (like most Cisco/HP/Junipers) that has not been configured for port security. The reachability of either host will flap on and off and be inconsistent.Ģ) Short answer: no.
DEVICES ON NETWORK MAC ADDRESS OF 00 UPDATE
So if there are two hosts, both with the same MAC address, then the switch will update it's MAC table every time it receives a frame from either host. Upon receiving any frame, the source MAC is read and compared with the current switching table, and then added alongside whichever switchport it was received on.
It bases this table on the source address of frames it receives during the normal operation of the network. So,ġ) In general, an Ethernet switch keeps a table of which MAC addresses are attached to which ports. It's possible for two hosts to have the same MAC, due to spoofing, a mistake during manufacturing, or willful negligence on the part of the manufacturer.
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