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Not connected pc's still appearing in the device list

Discussion in 'Tomato Firmware' started by luke-san, Feb 24, 2007.

  1. luke-san

    luke-san LI Guru Member

    Hi all,

    I've been monitoring my 'device list' lately.
    I noticed that pc's that are not connected anymore, even have been off the network for weeks, still appear in that device list.
    That means that they are still in the dhcp scoop and don't dissapear after the lease has expired.

    There is only 1 pc that I added to the static lease so the rest makes no sense to me...... except that there is a smc switch where all the devices where connencted to.
    One of my ideas is that the devices (mac) are still stored in the SMC it's memory.
    But then I would have to conclude that when I would ping the hostname, that appears in Tomato, I would get no reply (ofcourse) but get the ip-address that is still stored in the SMC, but that is not the case.

    Any other explanations or theory that would explain this?
    I've been browsing but I can't find where I can get the devices out of that list, anyone know?
  2. bokh

    bokh LI Guru Member

    I can delete my computers that have got an IP-address through DHCP by clicking under the Lease-tab in the "Device List" and delete them. They won't show up then...
    If yours aren't gone I think it must have something to do with ARP-caching in the switch.
  3. ifican

    ifican Network Guru Member

    ARP- caching is a viable bet though is should have a standard time out like anything else. If it bothers you that much, try to things to come to a better conclusion. Unplug the smc switch overnight if you need too and see if the router in its own right things there might still be a chance that they are there because the port is still active. If that does not work, reboot the router and that should clear it. It may simply be that the router retains that info until reboot as to keep track of hosts or potential hosts on the network and now unnecessarily use up ip's faster then it needs too and or always give the same ip to the same host for anyone that does not use static ip's.
  4. luke-san

    luke-san LI Guru Member

    Thanks guys, seems that smc switch has indeed been caching the ARP's.

    Now I ruined it's probable uptime of 6 years. It has never been off the mains and power failures are very very rare here. :)

    I set the leasetime to 15 minutes and tried the exact same thing, after the switch 'reboot', and now it seems to work without a glitch.
    Well, I guess 6 years is acceptable.

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