1.    24 Jun 2016 #1

    IPv4 name resolution - why does this get lost?

    I have a two PCs on the same subnet, hardwired into the same router. Every night they timeout and sleep, Every morning my KVM software Microsoft's Mouse without Borders complains (on each PC) that it cannot find the other PC.

    Both PCs have fixed (not dynamic) IPv4 addrs. The mouse software (which is used to cursor/cut/paste across multiple PCs using only the mouse and keyboard of one PC, operates on IPv4. Both PCs are configured so the software has the fixed IP associated to the name as backup to any dynamic name lookup. IPconfig shows the ipv4 values are correct. Both PCs seem to web browse just fine.

    Some have suggested to disable IPv6, but that causes certain other software networking issues on the web.

    So, to wrap up a long story, I came across a forum that hinted at an idea. I ping -4 at a command line on each PC to contact the other PC. SURE ENOUGH! As soon as ping sorted out the IPv4 connection and started showing reply packets, Mouse without Borders started working!!

    What went on on in Windows to wake up IPv4 and how do I configure Windows to keep using it without having to wake it when the PCs come out of sleep? Yeah, I might put a script in, as a work around, but what's the real fix?

    I'm guessing, someone here knows enough about netsh interface ipv6 show prefixpolicies to know if protocol priorities would fix this and how to use them.
      My System SpecsSystem Spec

  2.    24 Jun 2016 #2

    Found this https://support.microsoft.com/en-us/kb/929852 which include a diagcab for setting IPv4 or IPv6 as higher prio. Seems to work on Win10 but not on my other Windows PCs (v7).
      My System SpecsSystem Spec

  3.    24 Jun 2016 #3
    Join Date : Oct 2013
    Penns Forrest
    Posts : 3,506
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3

    Here's a general network trouble shooting thread:

    Resolve network issues

    You can probably start at #4
      My System SpecsSystem Spec

  4.    24 Jun 2016 #4
    Join Date : Oct 2014
    Posts : 1,527
    Windows 10 Pro x64

    Try to create this value: KeepAliveTime
      My System SpecsSystem Spec

  5.    24 Jun 2016 #5
    Join Date : Sep 2014
    Posts : 2,887
    Windows 10 Pro

    Windows caches dns lookups and ping requests. Including failed requests. So it may be that the software is using the cached failure and saying it can't be found.

    You could try this solution: windows 7 - How often does the DNS cache clear? - Super User
      My System SpecsSystem Spec


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