1.    28 Sep 2015 #1
    Join Date : Sep 2015
    Posts : 11
    Windows 10

    DHCP question

    What does it mean when it's said, "set your IP addresses as reserved (fixed) IP addresses outside of the routers DHCP address pool?"
    I have an Asus RT-AC87U and have set up a few devices for static IP's but I'm not sure which addresses would be considered outside of the DHCP address pool.
      My System SpecsSystem Spec

  2.    28 Sep 2015 #2
    Join Date : Jun 2015
    Ottawa, Canada
    Posts : 193
    Windows 10 Pro

    You would need to access your router's DHCP configuration to see what range of addresses it uses for distribution.
    If you set static addresses within the DHCP range then DHCP issues an identical address, you get duplicate address errors and associated problems from that.
      My System SpecsSystem Spec

  3.    28 Sep 2015 #3
    Join Date : Sep 2015
    Posts : 11
    Windows 10

    It uses thru 254. I assume if I want to use some for static addresses it's best to start at the high end of the range, yes?
      My System SpecsSystem Spec

  4.    28 Sep 2015 #4
    Join Date : Oct 2013
    A Finnish ex-pat in Germany
    Posts : 8,690
    Windows 10 Pro

    You can limit the address pool to for instance to, in which case the the router assigns the dynamic IPs from this pool. You can then use addresses to and to for devices you want to assign a static IP.
      My System SpecsSystem Spec

  5.    28 Sep 2015 #5
    Join Date : Sep 2015
    Posts : 11
    Windows 10

    I'll try that. Thanks again!!!!!
      My System SpecsSystem Spec

  6.    28 Sep 2015 #6
    Join Date : Jul 2014
    San Jose, California
    Posts : 1,870
    Ubuntu14.04x64 MintMate17x64 Win10Prox64

    I am not sure if you really need to reserve any address for Static IP. Setting up a static IP address for a device is actually bound the address to the MAC ID of the device so there's no chance that the router will assign the same address to another device. I always like to assign the IP's in sequence so I can easily identify them:
    Click image for larger version. 

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  7.    28 Sep 2015 #7
    Join Date : Jul 2015
    Posts : 5,874
    Windows 10 Pro

    One must remember there is a difference between assigning a static IP address on the client (computer) and setting a reserved address on the router. Topgundcp's example is setting reserved IP addresses on the router, which is the way I prefer to do it. The computer listed that way will always obtain the same IP address from the router - when it is connected to that network. It will probably pull a different IP address if the computer is connected to a different network.

    In the OP, "set your IP addresses as reserved (fixed) IP addresses outside of the routers DHCP address pool?" would be setting a static IP address on the client (within Windows network properties on the computer). If the static IP address set on the computer is within the range of addresses that the router dishes out (DHCP) then there may very well be a duplicate address assigned by the router and a conflict results. Also, if the computer moves (like a laptop) to a different network, the static IP address set on that computer might not work on the new network it attaches to.
      My System SpecsSystem Spec

  8.    28 Sep 2015 #8
    Join Date : Sep 2015
    Posts : 11
    Windows 10

    This is all great info that even I can understand.
    I'm going to tweak things, keep notes and see what happens over the next few days to a week.
    Good stuff ya'll!
      My System SpecsSystem Spec


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