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How to tell if wired client is active in DHCP?

Discussion in 'Tomato Firmware' started by ImGeo, Apr 5, 2010.

  1. ImGeo

    ImGeo Addicted to LI Member

    For wireless clients, when they disconnect, they change interface (from devices list) from eth1 to br0. However, for wired clients, it stays as br0 whether it's connected or not. (Also, wireless clients show a signal quality when connected).
  2. Badders44

    Badders44 LI Guru Member

    I'd like to know this also. The nearest I get is checking QOS / View Details.
  3. Toastman

    Toastman Super Moderator Staff Member Member

    Check in the Wake On Lan page....
  4. Badders44

    Badders44 LI Guru Member

    Ah. That's far easier. Why didn't I think of that...

    It a shame that can't be shown on the main device list
  5. Armand1234

    Armand1234 Addicted to LI Member

    Hmm.. i have all computers in Device List and WakeOnLan list when they are turned on and when they are turned off. I check them with ping to see is computer turned on/off, but problem is when some computer is in Stand By mode, specific computer is not in use, but ping reply is ok
  6. Badders44

    Badders44 LI Guru Member

    Trouble is even though the machines are switched off they still appear in the Device list.

    How does WOL know whether the machine is active? Ping?
  7. Toastman

    Toastman Super Moderator Staff Member Member

    Device list shows which computers still have a lease, so there's nothing wrong with that. Maybe an extra "Active" column with a tick if in WOL list might be a nice addition. Or even combine the two ...
  8. Badders44

    Badders44 LI Guru Member

    Agreed. A combination of the two would be nice.

    Just out of interest, how does the WOL screen work? Is it by pings?
  9. Toastman

    Toastman Super Moderator Staff Member Member

    ARP, I guess ... anyone?
  10. mstombs

    mstombs Network Guru Member

    The device list uses the arp table (cat /proc/net/arp) to determine what devices are connected. Dynamic devices hang around in that table for about 5 minutes before dropping out. WOL uses "magic packets", sent to the machines Ethernet card MAC address. If you want to wake a machine by static IP address it needs to have a static arp assignment to link IP and MAC, and it must be this that fools the device list.

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