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Asked: 2026-06-09T17:09:21+00:00

First, I need to know this in kernel space, so please take this into

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First, I need to know this in kernel space, so please take this into consideration.

No, I cannot use the IP address of the other device and ARP it(too long to explain why here) but I simply cannot use ARP, ARP won’t work for the project I am working on.

Is there a function/utility I can use to know the MAC address of the other end in a connection attached to a given net_device I already have regardless of the IPs?

Thanks in advance, and if my question is not clear or makes no sense, leave a comment and I’ll make sure to edit the question to explain/fill in the gaps

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1 Answer

  1. Editorial Team

    The standard protocol for “I need to speak to my neighbor” kind of problems is LLDP. At the moment, this is usually implemented via OpenLLDP (user-space) on Linux systems. However, there appears to be some kernel-space patches on the way that might help you:

    Supposing you have the possibility to enable LLDP on the other end, you should be able to use it to discover that device.

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