Bonded Broadband

Service Description
The service provides a load balanced service across two or more similar speed DSL connections. Automatic fallback occurs if one or more connection fails, with automatic re-instatement when the service is re-established.

Example Customer Requirement
In the simple case, a business may require either faster ADSL upload speed, or may wish to add resilience and redundancy in order to maintain their business critical Internet connection.
The solution from Interdart is to provision two ADSL lines using the same speed and contention ratio, and then bond them together to double the incoming and outgoing speeds (See notes on tunnelling and packet sequencing) to 1Mbit and 512Kbit respectively. The total cost for this solution will be as follows:

Example Pricing

Service	Month	Set-up
2 X Interdart Business 500 ADSL channels @£32	£64	£80
Interdart provisioned ADSL, per channel £3 X2	£6
Interdart provided Basic 2 channel router		£400
Backup 0845 dial-up option (Modem not included)	Free
Total	£72	£480

Whilst is must be noted that the set-up costs are higher, the monthly operating cost of £72 is slightly more than a 1Mbit single ADSL connection however the service will provide nearly double the upload speed and will automatically fall back to a single connection if a failure occurs in either of the two ADSL connections.

If you are interested in the technical implementation details, please read the technical notes.

Features

Up to four ADSL or SDSL lines bonded to one fast connection
Load balanced on both the uplink and the downlink
Automatic fallback if one or more circuits fail
ADSL from any UK Service Provider
Achieve Up to 95% of theoretical throughput
Automatic Failover to ISDN or Modem
Static Routed subnet of 4 or 8 IP addresses

Requirements

Two or more fixed IP ADSL or SDSL connections with the same speed and contention
Suitable Linux Router (See below )
ADSL Ethernet Modem (See below)
Analogue modem if backup dial option is taken

Failover
The service can also be configured for automatic failover, with or without bonding. Automatic failover will switch all (or selected) traffic to a backup ADSL or dial-up service in the event of a failure in the principle connection.

Contention
The Bonded service is offered on a contended traffic basis. The service is contended at 10:1, half the rate of normal Business ADSL. This contention is entirely separate to the ADSL/SDSL contention.
The Tunnel server implements the contention and uses sophisticated fairness queueing and prioritisation algorithms to ensure that heavy users do not unduly degrade performance for normal users.

For details and prices of uncontended bonded services please contact sales@interdart.net.

Bonded Broadband Prices

Service	Month	Quarter	Year
Interdart provisioned 2 channels domestic use only	£5	£15	£60
Interdart provisioned per channel business use	£3	£9	£36
512k ADSL not provisioned by Interdart, per channel	£7	£21	£84
1024k ADSL not provisioned by Interdart, per channel	£12	£36	£144
2148k ADSL not provisioned by Interdart, per channel	£20	£60	£240
Routers (optional support with above services)
Basic router support and maintenance	£7.50	£22.50	£90
Advanced Router support			£call

Hardware

All our Bonded Broadband routers support NAT, Port forwarding and statefull firewall. They can also be configured to support IPSec, PPTP and OpenVPN virtual private networks (VPN).

Advanced router optional extras include eMail spam and virus filtering, eMail POP3/IMAP server, Apache web server with support for PHP and mysql.

Routers

Routers	Price
Basic Router/Server with 2 ADSL Channels including modems	£400
Basic Router/Server with 2 ADSL Channels including modems Rackmount	£450
Basic Router/Server with 4 ADSL Channels including modems	£600
Basic Router/Server with 4 ADSL Channels including modems Rackmount	£650
Advanced Router/Server 4 ADSL Channels	From £1000

If you have the expertise to set up and configure your own Linux router, we will supply the scripts required to support bonding. The scripts are being developed for systems based on the Leaf Bering distribution.

Supported ADSL Modems and Routers

BT Voyager 205
D-Link 300T
X-Modem
Any ADSL Router provided you have a routed subnet and can provide a single Internet IP address to the Linux router.

All prices on this page are subject to VAT.