A phone is receiving ip address of the firewall when it connects to the network

Hi,

sounds like some fixed addresses or not renewing from the isp wifi connection when away from your network.

ian

This is the phone 

This is the phone 

Hi Anesu Dangarembwa  Can you please confirm whether there are multiple DHCP server exits or not in the network? As you have also mentioned some machines are getting an IP address below 192.168.10.16 and that is not the DHCP scope set in the Sophos DHCP Server, so from those machines pick 1-2 machines and do the DHCP renewal, and capture the Wireshark on the relevant interface during this DHCP renewal process, once PCAP is captured check the MAC address to see if it is of which vendor and if any such vendor device exists in the network then confirm DHCP is enabled or not in that device! 

Hi Vishal we found out that the DHCP service in the active directory was also running 

Hi Anesu Dangarembwa  Thank you for the latest update and I am glad you managed to fix the issue based on the last comment feedback and suggestions!