They will always return MAC address as 00-00-00-00-00-00. The above technique wont work on Linux samba servers.
But if network has lot of Linux machines then there is no good very common way to find MAC from other networks. Hence if there are lot of windows machines on your network you can find MAC address for them even when are not in their subnet. But I guess you have to be administrator for accessing router or DHCP server.
Then the only options are seeing MAC address table in router, or if there is common network wide DHCP server then you can see MAC address in DHCP logs. If the machine in question is not a windows machine and there is no way to become part of other subnet. To do the same thing from Linux machine (with samba installed) use command nmblookup -R -S -A For example to find MAC address of a Windows PC on other network when you know its IP address you can use command nbtstat -A But there are some protocols that may help you in finding MAC address from anywhere in network. That said, checking the MAC address is not a reliable way to verify your peer's identity, anyway, since MAC addresses are easily forged.ĭepending on your needs, you may want to consider better, well-established and reliable means of host authentication such as TLS client and server certificates.It cannot be guaranteed that you can see MAC address of machines behind a router. It certainly sees the MAC address, and if you have administrative or SNMP access to it you may query it for that information.Ĭ) Some other host on that network segment you can control, and from which you can issue an ARP request for the IP address of the host under investigation. It may also inadvertently expose it, for example by using it as the host part of its IPv6 address or otherwise including it in its layer 3 traffic, but you cannot rely on that, either.ī) The router forwarding packets from that network segment to you. You could simply ask it, but of course it may lie, so that's hardly useful if your goal is to unmask an impostor. Possibilities:Ī) The remote host itself whose MAC address you want to retrieve. In order to get a MAC address from a network segment you are not directly connected to, you need the cooperation of a node which is directly connected to it. This is the underlying reason why ARP does not work across routers. It is stripped when a packet is passed to layer 3 (network layer). The MAC address is a purely layer 2 (link layer) property.
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