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I am wondering if there are any Linux tools out there which might aid in identification of hosts directly connected to each other (much like Cisco Discovery Protocol on switches)?

I have found http://sourceforge.net/projects/lcdpd/ which searching. But it appears to be a dead project and the patch is only for older kernels.

I am just trying to alleviate the tedious task of ethernet interface to ARP MAC address to hostname lookup. A bonus would be something that also announced its own neighbors so you could have a 2 hop view of the rest of network.

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    What's the use case here?
    – EEAA
    May 7, 2012 at 22:48
  • To help remotely identify port to port mapping of Linux machines connected to each other without a switch.
    – Andy Shinn
    May 7, 2012 at 23:14
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    So you have a bunch of servers connected directly? Sound very painful.
    – EEAA
    May 7, 2012 at 23:43

1 Answer 1

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Are you looking for LLDP?

Agent software is out there for Linux, and many network devices support it.

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    Yep, this looks like what I was after. Actually, the Intel LLDP agent doesn't provide much information at all. With some more searching about LLDP I discovered github.com/vincentbernat/lldpd which does a simple output of the LLDP neighbors, their interface, MAC, hostname, IP address, and more. This becomes very helpful information when there are no switches to provide a MAC table.
    – Andy Shinn
    May 7, 2012 at 23:52
  • The LLDP information also led me to netdisco.org which appears to be exactly what I was looking for.
    – Andy Shinn
    May 9, 2012 at 16:24

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