Find out the MAC address of a machine.

[UJ]

Is there any way to find out the actual MAC Address that a request comes in
from? We are trying to get a way where we can limit access to specific
machines (TCP/IP isn't good enough - we want to do it at the actual machine
level where the user can't trick it.)

TIA.

 

[Guest]

Just as a side not... MAC can be spoofed as well.

 

[thinkfr33ly]

Essentially, no.

The MAC address of a packet changes as it travels from network to
network. If I PING a machine on network B from network A, the MAC
address of the packet arriving at the machine on network B will be of
the interface on the router that routed my request from network A to
network B.

So you can get the MAC address, but that address will not be of the
machine sending you the request.

 

[Bruce Barker]

if its a local address, and you are using dhcp (or wins), you can use the
ipaddress to lookup the mac address in the dhcp (or wins) server. over the
internet or extranet you would have to install an active/x control (which
would be unsafe) whcih was used to pass the mac address

-- bruce (sqlwork.com)

 

[John Rivers]

if its any help

the command "arp -a" prints the ip:mac address table

C:\Documents and Settings\Nincompoop>arp -a

Interface: 192.168.1.3 --- 0x5
Internet Address Physical Address Type
192.168.1.1 00-12-f5-5f-a7-63 dynamic

Interface: 192.168.2.1 --- 0x6
Internet Address Physical Address Type
192.168.2.6 00-03-2d-13-7d-e2 dynamic