BT hub randomly reassigns DMZ

[borochris]

I have an internal firewall set up in the router as the DMZ.

Seemingly at random the hub switches the ip for the dmz to a different device. Today it was my phone.

Apart from the inconvenience and loss of service this causes this is a huge security hole.

To clarify, the devices have not changed IP only the dmz pointer.

[licquorice]

Is the IP address of the device you wish to be in the DMZ outside of the DHCP range of the hub and assigned as a static address on the device itself?  It shouldn't matter, but it might be worth making sure that it is.