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Knowledge base Router setup

Router details

The following details are technical information for setting up a DSL router to make use of services on our ADSL lines (BT and TT).

Line typeAutoUsually set this to automatic as it allows ADSL or ADSL2+ (depending on modem and line type).
ModeRoutedThis means that IP traffic is routed, and is the normal mode unless setting up a PPPoE bridge to another device.
PPP modePPPoAWhen routing IP you want your router to connect using PPPoA mode. PPPoE (see below) is more commonly used when bridging to a separate PPPoE device such as a FireBrick
VPI/VCI0/38This is often the default on most broadband routers
MuxVC-MuxThis is often the default on most broadband routers
LoginAs advisedWe allocate a login for one or more lines. This is of the form of a name followed by @, a realm, a dot then a single digit number. (e.g. test@a.1). The final number is the line number (e.g. 1, 2, etc) for where customers have multiple lines sharing IP addresses.
PasswordAs advisedWe allocate a password, but you can change this on the Broadband Control Pages. If you change the password on our system your lines will go off line until you change the password on the router as well. If your router cannot handle the length of password we provide, please contact support who will be happy to set a shorter password.
WAN IP (local) we allocate a fixed IP address for your service, including the WAN address, it is best not to set this as it is allocated automatically using PPP. If you configure this incorrectly you will normally find you cannot log in at all.
WAN IP (remote) IP address for our end of the PPP link should not be configured. This is allocated by PPP automatically. This will change depending on equipment at our end and may even change on every connection in the future.
LAN IPAs advisedIf using NAT then this will be some default such as If you have a block of IPs from us, use the IP and netmask as advised. DO NOT make up a netmask for use with a real IP address that we have allocated - always use the one we have advised.
RoutesAs necessaryIf you have a separate router/firewall link block, you will need to configure a static route for your main IP block via your router/firewall. You may want your DSL router to act as a DHCP server for your LAN.

PC/device details

Your PC will normally be configured to obtain an IP address and DNS servers automatically, and so not need any special set up. This will depend on how you set up your network and your DSL router.

These are provided to your router via PPP, and some routers will provide a DNS relay feature allowing you to use your local router LAN IP address as a DNS service. If configuring manually please use these two addresses as our main customer facing DNS resolvers.

IPv6 setup

IPv6 is normally automatic. If your DSL/PPPoE router supports IPv6 properly it will obtain an address for itself, and for allocation to devices on your LAN automatically when it connects using DHCPv6.

6over4 gateway81.187.81.6If configuring your network to tunnel IPv6 traffic over IPv4, use as a gateway. You can also use the standard 192.88.99.X block as a gateway if using 2002:: prefix address space based on your IPv4 addresses.
IPv6 addressAs advisedYou can use any address space from the block assigned to you. You can also use 2002:: prefix space using any of your IPv4 address space. All of these addresses will be accepted from your line whether native IPv6 in PPP or tunneled over IPv4. Other source addresses will not be accepted. The router address and prefix delegation can be obtained by the router using DHCPv6 over PPP.
These are our customer facing DNS resolvers for IPv6 use. The DNS servers can be obtained by your router using DHCPv6 over PPP.

Please note that most DSL lines (BT and TT) do allow PPPoE mode. This can be useful when using a bridging modem. In such cases you need the LLC-Mux normally. For FTTC and FTTP the only operational mode is PPPoE directly with RFC4638 support allowing 1500 byte MTU.

We have more information about this subject on our Wiki