Unlocking BT 2Wire 2700HGV Business Hub (wireless router)

 

Contents > Advanced Configuration:

 

 

 


Can the 2700HGV be used as a router connected to my cable modem?

 

Simple answer:        No, for the original BT 2700HGV v1 and v2 models. A bug in the BT v6.3.x firmware which causes it to loses a setting prevents the 2701HGV-C being used with most cable modems.

 

The BT 2700HGV only has a RJ11 socket labelled 'DSL' on the rear panel for connecting to an phone/ADSL line.  This is not ethernet and so is not compatible with single port ethernet modems supplied by most cable companies.  There is no other socket intended for a WAN connection.



You can however configure the 2700HGV as a Wireless Access Point (WAP) and attach it to any existing cable 'router'.

 

The 2701HGV-C also features an additional ethernet WAN port for connecting to a BT VDSL ethernet modem.



The firmware permits the choice of DSL or WAN ethernet port to be selected.










2700 as an ADSL 'bridge' modem



Wireless routers with built-in ADSL modem which perform well and reasonably priced are often difficult to find, or you may have a reason for wanting to keep the 2700 as an ADSL modem but also wish to use a much better wireless router to take advantage of improved performance and recent advances in technologies such as dual band wireless.


There are two possible options: use DMZplus or Bridge mode. The following information is reproduced from Google searches. I would strongly recommend Bridge mode for best performance.



Screenshots below are shown for BT v6.3 firmware.



DMZplus mode

This method is generally not recommended.

Connect the external router's WAN port to the 2700, and configure the Firewall settings so that the external router is placed into the DMZplus mode. The external router should be configured to use 'Direct DHCP/IP'. The external router will acquire the public IP address assigned to your internet connection.

As well as disabling the wireless interface on the 2700, you may also wish to review the following pages too:

Settings → LAN → NAT & Address Allocation

Settings → Firewall → Advanced Configuration





Bridged mode and PPPoE

BT v6.3.9.x Warning: Apparently there is a bug in this firmware which will cause the Bridge mode settings to be lost and revert to PPPoA if the hub is power cycled. I believe this bug affects all 2700/2701 models running v6.3.x firmwares. Older BT firmwares are not affected.

(Added Jan 2014) If you wish to use your old BT 270x hub as a bridge modem, you can consider flashing v6.1.1.22 beta firmware onto the hub which does permit you to use bridge mode and the setting won't be lost if the hub is power cycled. It is also recommended to use Adrian C's fix to block the provisioning server. Note that if you downgrade to v6.1.1.22, you will Not be able to return to original v6.3.9.x firmware installed on the hub.





The BT broadband network in the UK generally recommends the connection type: PPPoA on ATM encapsulation: Routed VC-Mux. This offers the lowest overhead and hence maximises performance. However, PPPoE is also supported on the BT network.

In other countries, PPPoE is more prevalent. In fact, I believe you can use PPPoE on the BT network if you change the ATM encapsulation type to Routed LLC in the 2700HGV. However, PPPoE and LLC both increase the overheads resulting in a slight reduction in performance. You may also need to reduce the MTU to 1492 or less (eg. 1454) to achieve optimum performance. In summary: PPPoA on VC-Mux offers better performance than PPPoE on LLC.

To the best of my knowledge, Sky Broadband and TalkTalk Broadband do not support PPPoE on their LLU networks.

Most external non-ADSL routers do not offer PPPoA connection option. To connect such a router to a 2700, you must configure the 2700 to use Bridged mode as described below. The external router should then be configured to use PPPoE. The external router is responsible for all authentication, so you also input/store the relevant PPP username and password within the external router.



Reproduced settings from information contained in this BT Business Broadband forum thread and from here. Applicable to users connecting to BT wholesale provided ISP connections. These are the settings for 2700HGV using BT v6.1 firmware:

Go to Settings> Broadband> Link Configuration and set the following settings…

VPI: 0 VCI: 38

ATM Encapsulation: Bridged LLC

ATM PVC Search: Disabled (unchecked)

Connection Type: Direct IP (DHCP or Static)

Press Save button to save the settings (Do not skip. This is a VERY important step)

Go to Settings > Broadband > Link Configuration

Disable Routing at the bottom

Press Save button to settings again.

It is also recommended to disable the wireless connectivity on the hub.



Configure the ATM Circuit Identifier settings accordingly for your internet connection.

If you are using v5 firmware, you will need to access the hidden home/mdc page to disable the Routing functionality.





Once the DHCP server and Routing are both disabled, the only way to access the 2700 to change any settings or to view the line stats, will be to manually configure a static IP address on your computer, connect via ethernet cable to the hub (unless you left the wireless enabled), and point the web browser to 192.168.1.254 address. For BT 2700HGV, these would be the typical settings which you could use:

ip address: 192.168.1.xx (eg. 192.168.1.10)

subnet mask: 255.255.255.0





How to configure new router when using a 'bridge' modem

Setting up the new router to connect to the 2700HGV bridge modem should be straightforward. The screen shot below shows a router running DD-WRT firmware, but it should not be any different for any other brand of cable/fibre router.

For an ADSL or VDSL (fibre) connection provided by BT wholesale (BT, Plusnet etc) within the UK, you simply need to choose PPPoE connection type, provide the PPP username and password provided by your ISP, and remember to check that the MTU is set to 1492.





If you are using DD-WRT, it is also possible to access the 2700HGV modem via the DD-WRT router. This is useful to examining the ADSL line statistics and system logs.

The default IP address of the BT 2700HGV using BT v5.29.x or v6.1.x firmware when operating in bridge mode is 192.168.1.254 – this cannot be changed.

If you wish to manage the 2700HGV, you will need to ensure your new router is configured to use a different subnet. ie. The IP address of the DD-WRT router must not be in the 192.168.1.x range. You will need to change it to: eg. 192.168.0.1, 192.168.2.1, or 10.0.0.1.

Now you need to assign a LAN IP address to the WAN port of the DD-WRT router which is in the same subnet as the 2700HGV's IP address. eg. Assign 192.168.1.2 by adding this command into the 'Commands' box located in the Administration > Commands menu.

ifconfig `nvram get wan_ifname`:0 192.168.1.2 netmask 255.255.255.0

Then press 'Save Startup'



Now add these commands into the 'Commands' box

iptables -t nat -I POSTROUTING -o `nvram get wan_ifname` -j MASQUERADE

Then press 'Save Firewall'.

Now restart the router for these commands to take effect.



You should now be able to access the 2700HGV using a web browser, by using the IP address 192.168.1.254.

See also http://www.dd-wrt.com/wiki/index.php/Access_To_Modem_Configuration#Primary_Method










The majority of ADSL connections in the UK use PPPoA unlike in other countries where PPPoE is preferred.

Most 3rd party non-ADSL routers tend to offer Direct IP/DHCP, PPTP or PPPoE connection types. I've not yet come across a router that offered PPPoA. I don't believe the 2700HGV with BT firmware supports PPPoE to PPPoA bridging, but I do believe PPPoE is supported on BT broadband networks provided the modem/router is correctly configured to use PPPoE over LLC. (PPPoA recommends use of VC-Mux.)



From this thread, Idnetter jameshurrell successfully uses Draytek 2910 router connected to 2700HGVs running BT v5 or v6 firmwares in bridge mode.

From this thread, Idnetter jazzist was unsuccessful with connecting an inexpensive Buffalo WHR-G300N v2 to a 2700HGV in bridge mode.

I can confirm 2700HGV running v5.29.117.6 and v6.1.1.22 beta, work successfully in bridge mode on a BT ADSL2+ WBC connection. I have an old Dlink N300 wireless cable router attached to the 2700HGV bridge modem.






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