DHCP question


  1. Posts : 46
    Windows 10
       #1

    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.
    Thanks!
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  2. Posts : 193
    Windows 10 Pro
       #2

    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.
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  3. Posts : 46
    Windows 10
    Thread Starter
       #3

    It uses 192.168.1.1 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?
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  4. Posts : 17,661
    Windows 10 Pro
       #4

    You can limit the address pool to for instance 192.168.1.100 to 192.168.1.200, in which case the the router assigns the dynamic IPs from this pool. You can then use addresses 192.168.1.1 to 192.168.1.99 and 192.168.1.201 to 192.168.1.254 for devices you want to assign a static IP.
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  5. Posts : 46
    Windows 10
    Thread Starter
       #5

    I'll try that. Thanks again!!!!!
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  6. Posts : 2,799
    Linux Mint 20.1 Win10Prox64
       #6

    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:
    DHCP question-.jpg
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  7. Posts : 18,424
    Windows 11 Pro
       #7

    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.
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  8. Posts : 46
    Windows 10
    Thread Starter
       #8

    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!
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