Port forwarding on the BT Home Hubs
Home hub 3 firmware issues.
There has also been a report that a
recent firmware update to the HH3B, may have broken the
port forwarding facility.
have BT done to my system
IP address sharing
BT are implementing CG-NAT for certain Option
1 customers. This will prevent port forwarding from
For more information, please visit this link.
IP address translation/sharing
The test that BT suggest, relies on BT keeping their
information updated on the databases, and as more
of BTs IP ranges are being shared, this may not be be
Broadband IP address as shown on your home hub, must be the
same as your public IP address,
otherwise port forwarding will not work, as you would be on
Here is an example of a CG-NAT address, from one of our forum
If the displayed address is in the range 100.64.0.0
then you are sharing your IP address with other users.
BT Guide for the Home Hub Port
Forwarding with Home Hub
You can check to see if port forwarding is working by
using a number of free sites like Canyouseeme
can I connect to my webcam or NAS if my public IP
The home hub 4 and 5 have no reported issues.
There is an example of an IP camera on a HH4 here Foscam IP camera on HH4
and an example for a NAS on the HH5 Synology NAS
If you are going to manually assign ports, then you must disable
uPnP as that will cause conflicts.
assign a static IP address outside of the home hubs
DHCP range, to the device that you are trying to
You have to do this on the device itself, so read
the product manual.
Using the option "always use this IP address" on the home hub,
is not the same, and usually fails.
There is a guide to assigning static IP addresses here Using
static IP addresses on your home network
There are also some more examples on this page Hardware menu
When you come to actually assigning the application, make sure
that you assign it to the IP address of the device, and not
the device name.
The option to do this, is under "user defined", where you are
given the option to enter the IP address. You will need to go into
the home hub advanced settings to do this.
On the link below, is an worked example of port
forwarding on a home hub 2 and 3.
gives the steps that you need to take to make sure port forwarding
works properly. Its for a VPN,
but you can modify the settings to suit your own application or
Port Forwarding on the BT Home Hub 2 or 3
and later home hubs.