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Cant reserve IP in the DHCP Pool

Shahzad Ali

Hi,

Hopefully you are all going Great.

Currently i am using Sophos XG VM firewall all things are working fine but i have a little issue i am running DHCP Server in the Sophos XG VM. My DHCP IP POOL is 192.168.123.100 - 192.168.123.200. The problem is i cant reserve IP in the DHCP IP pool. The following error occurred when i am trying to do this..

 

"DHCP Server could not be configured. IP address specified for 'Static IP MAC Mapping' cannot be from the range specified for 'Dynamic IP Lease"

 

please help.



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  • +1

    Ali,

    you cannot create a reservation for IP in the DHCP pool range 192.168.123.100 - 192.168.123.200. So if you need to reserve an IP, use an IP between 192.168.123.1 - 192.168.123.99 and/or 192.168.123.201 - 192.168.123.254

    This is how it works at the moment.

    Regards

  • 0 in reply to lferrara

    I know I'm resurrecting this from a year ago, because I need this and So this begs the question, why have the Static IP MAC Mapping option available? if you cannot reserve from the DHCP pool.

    That is the sole point to reserve an IP from the DHCP pool. Anything outside the DHCP pool is ALREADY static. This confuses me, someone at sophos didn't think this through and amazingly even on latest release XG 17.1, this issue is still present. 

     

    UPDATE: for anyone who is frustrated, don't be, the DHCP static mappings work inverse of a standard router. You specify the static mappings with the MAC address and a IP address OUTSIDE the DHCP pool, when client reconnects to network, it will get the static IP address that you assigned outside the DHCP pool. 

  • 0 in reply to max d

    Hello,

     

    It's even better. If your NIC that you plan to use DHCP server has got IP address that is within the DHCP Pool then DHCP will not start. 

     

    It's 2020 now and DHCP implementation on Sophos XG still lacks the very basic DHCP functionality.

     

    There are no in-scope reservations

    There are no in-scope exclusions

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  • 0 in reply to max d

    Hello,

     

    It's even better. If your NIC that you plan to use DHCP server has got IP address that is within the DHCP Pool then DHCP will not start. 

     

    It's 2020 now and DHCP implementation on Sophos XG still lacks the very basic DHCP functionality.

     

    There are no in-scope reservations

    There are no in-scope exclusions

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