Getting the MAC address of the remote host

Question

I just a moment ago saw a request for finding the MAC adress of a remote host. An answer was that the MAC address is always sent as part of the TCP/IP protocol.

How would I go about retrieving this information from an ASP.NET C# application?

See: Reference to sister-post

Answer 1

Any such answer is false. The MAC address of an adapter is only available on the same network segment. Not on the other side of a router.

Answer 2

If your remote device is SNMP-enabled you can query it for its ARP cache. That will have the MAC address in it. See this FAQ entry for more info.