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Cant reserve IP in the DHCP Pool

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 lferrara over 7 years ago

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
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+1 lferrara over 7 years ago

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
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0 Shahzad Ali over 7 years ago in reply to lferrara

Hi,

You mean to say this is the default behavior of Sophos XG Firewall? Every firewall give an option to reserve IP in the DHCP pool. The answer you given me i already knows.

Anyways Thank You for your reply...
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0 lferrara over 7 years ago in reply to Shahzad Ali

Yea Ali,

this is the default behaviour.
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0 farhan ahmed over 6 years ago in reply to lferrara

Great ! small router able to reserve IP Address from DHCP Pool and SOPHOS FIREWALL fail to do. IP Address Range which are not include in DHCP POOL will be static,,,,, what is the use of that kind of reservation,,, if we cannot reserve it from pool..

Please find the attach screen shots...
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0 max d over 6 years ago 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.
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0 mtr over 4 years ago 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 onward over 4 years ago in reply to mtr

https://ideas.sophos.com/forums/330219-xg-firewall/suggestions/38890579-dhcp-allow-static-lease-of-addresses-within-the-d
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