THE NAS KEEPS DROPPING OFF THE NETWORK. TURNS OUT IT HAD A TWIN

Solveddhcpip-conflictlan8 replies 路 201 views 路 started

Accepted solution

by Cleo AdlerJump to the reply

find who owns the IP. from a machine on the same subnet: arp -a (Windows) or ip neigh (Linux) shows the MAC for the address after you ping it... look up the MAC vendor prefix and check the switchs MAC address table to find the port.

  1. hmmmm ok small office, 10.0.0.0/24 network. since last week the NAS disconnects every few hours, and a nearby PC shows this:

    Rebooting fixes it temporarily. Nobody admits to changing anything. i suspect smth has teh same IP, but how do i find out what?

    we dont have a proper netowrk diagram, and teh person who set up most of teh devices left a while ago, im teh IT person because Im good with computers... any simple way to find teh duplicate would help.

    2
  2. been there man prevent rogue servers with DHCP snooping on managed switches: mark the uplink to your real DHCP server as trusted, all other ports untrusted.

    0 1 helpful
  3. oof if clients get addresses outside 10.10.20.0/24, you have a second DHCP server: often a consumer router someone plugged in, or a device with DHCP enabled by default. on Windows, ipconfig /all shows the DHCP Server address teh client actually used 馃槀 Then find and unplug it. lmk how it goes

    6 1 helpful
  4. Accepted solution

    find who owns the IP. from a machine on the same subnet: arp -a (Windows) or ip neigh (Linux) shows the MAC for the address after you ping it... look up the MAC vendor prefix and check the switchs MAC address table to find the port.

    0 4 helpful
  5. long time lurker first post lol my moms pc is officially haunted pls help 馃檹

    thinking

    1 0 helpful
  6. been there man make a backup before u touch the BIOS, learned that the hard way

    40 1 helpful

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