Force netsh/arp binding multicast IP addres with specific MAC address
- by Olivier
I would like to setup an binding from an IP address to a MAC address using netsh.
Goal is to bond an IP address which is a multicast address (224.224.x.y) to a given MAC address (which is NOT the calculated one from the multicast IP address : 01:00:5e:X:Y:Z
It used to work with Windows XP (was it a bug that used to be "perfect" for my needs?), but Windows 7/8/8.1 forces the MAC address to the calculated one instead of letting me put what I want! (http://nettools.aqwnet.com/ipmaccalc/ipmaccalc.php shows MAC address calculation for multicast IP address)
Thus I'm doing the following.
Listing existing mappings:
netsh.exe interface ip show neighbors "Ethernet"
Interface 12 : Ethernet
Internet address Physical address Type
224.0.0.22 01-00-5e-XX-YY-ZZ static
Then adding my interface mapping manually:
netsh.exe interface ip add neighbors "Ethernet" "224.xxx.yyy.zzz" "00-80-EE-UU-VV-WW"
Finally, listing again my mappings:
netsh.exe interface ip show neighbors "Ethernet"
Interface 12 : Ethernet
Internet address Physical address Type
224.0.0.22 01-00-5e-XX-YY-ZZ static
**224.xxx.yyy.zzz 01-00-5e-UU-VV-WW static**
As you can see, the MAC Address of the second entry (the one I just made) has been dynamically replaced by the calculated MAC Address corresponding to my IP Address...
Calculation is done as follow (and displayed in hexa):
UU=(xxx-128)
VV=yyy
WW=zzz
But I don't want that behavior. My IP address and MAC address cannot be changed, and I must associate them accurately.
Does anybody know how to disable MAC address substitution/calculation in netsh?
Thanks, Olivier.
