*255 broadcast address assigned to one computer

[katun]

I get this when scan my network with Colasoft MAC Scanner:
                   
10.0.10.226          F8:1E:DF:F2:54:C6          COMP-name
10.0.10.255          1C:65:9D:39:DF:B9         COMP-name

The same is shown  by SoftPerfect Network Scanner.

The user of that device receive daily messages about IP conflict.
When that specific device isn't connected on the network another one appear to be assigned to broadcast address.
And also this one receive IP conflict message.
If the first one is connected back, he get back the broadcast address.
Somehow his device is preferred by this error, only when isn't on the network choose another device, and I am the other one!
First device is a MacBookPro and my PC is a PackardBell (Acer Group), both are connected via WiFi routers TP-LINK, same model but not the same router.

So, how it is possible? And what can I do to fix it?
It is an error of network configuration, or what else?
 

[DaveLembke]

The system on x.x.x.255 needs changed to be set to any IP Address between x.x.x.2 and x.x.x.253

Addresses that are

x.x.x.0
x.x.x.1
x.x.x.254
x.x.x.255

are reserved and computers should not be on these IP addresses even if it were a Peer-to-Peer network with only2 computers. By habit always use x.x.x.2 to x.x.x.253 for computers. You can set it static vs dynamic and fix this, although thinking your already using static IP address vs DHCP dynamic because DHCP is incremental from the starting IP and then allocates within the range that is set. On most routers out of box they want to operate DHCP on 192.168.1.x and the router wants 192.168.1.1 and will give the first computer or network device/printer etc 192.168.1.2 and then the next device/computer 192.168.1.3 and so on. However depending on router features you can tell it to start the DHCP IP address pool at 192.168.1.100 and so 192.168.1.2 thru 192.168.1.99 are free for static IP network configured devices etc. I like to put network printers etc on static configuration vs having it float on DHCP where if the printer is shut off for too long it loses its temporary lease on IP reservation. Its nice when set static and always at say 192.168.1.10 etc.

[katun]

On my network I use 10.0.10.1 for the gateway router and 10.0.10.254 for a LAN printer.
Do you think it will be better to change this?
I know that is not good to use x.x.x.0 and x.x.x.255, but why x.x.x.1 and x.x.x.254 are restricted too?
Most of the router have x.x.x.1 IP by default!

[DaveLembke]

Router/Gateway on x.x.x.1 is correct!

Printer on x.x.x.254 I'd move if this is a corporate/business network. If its a home network you can have your IP's any way that you like pretty much, but its best to stick with the x.x.x.2 to x.x.x.253 range byhabit for computers and devices that are not normally on the reserved IPs.

[katun]

Ok, I have changed the printer from x.x.x.254 to x.x.x.252, but the problem still exist.
I have always one of the computers from my LAN associated with x.x.x.255!

So, I have the same MAC address associated with two IP's, but the host name is different.
On x.x.x.255 appear the MAC address of my PC associated with the host name of a MacBookPro?!

IP Address           MAC Address                Host Name                     
10.0.10.211         1C:65:9D:39:DF:B9      PACKARDBELL-PC
10.0.10.226         F8:1E:DF:F2:54:C6       MACBOOKPRO-DB46                                                   
10.0.10.255         1C:65:9D:39:DF:B9      MACBOOKPRO-DB46
 
How can be possible? And what can I do to fix it?
 

[DaveLembke]

I am not familiar with Apple/MAC OS, but you will want to manually set the IP to static IP of an IP that is not already in use between x.x.x.2 and x.x.x.253

That is the fix for this computer that shouldnt be at x.x.x.255

As far as 2 systems with the same MAC address that makes no sense. I have only seen it once and it was when a MAC address was edited to be cloned to another system for reservation purposes on DHCP where 2 systems, one in use and the other as a backup system clone to the system for quick swap, and this allowed for a lower level IT employee to swap out a tower and when it booted it would be at say 192.168.1.250 just like the other system that was removed due to a failure of some kind.

Where are you finding this information? And if you ping 10.0.10.255 is it responding or offline? You can try IPCONFIG/FLUSHDNS from PC command prompt/shell and see if it is still there if you are seeing this just from the PC.

IP Address           MAC Address                Host Name                     
10.0.10.211         1C:65:9D:39:DF:B9       PACKARDBELL-PC
10.0.10.226         F8:1E:DF:F2:54:C6       MACBOOKPRO-DB46                                                   
10.0.10.255         1C:65:9D:39:DF:B9      MACBOOKPRO-DB46