Bonded DSL – How it works

Q – How does the Precept IT solution differ from other suppliers’ solutions?


Aggregated connection – The Precept IT way
Bonded DSL works by bonding up to 4 standard broadband lines together, creating a single virtual broadband connection to the internet for your business. The Precept IT Bonded DSL solution uses an aggregated connection for all IP traffic.

The required hardware is provided for each line. This adds resilience to the Bonded DSL solution.
The estimated combined speed of the Bonded DSL solution will determine the hardware you require. Some solutions may need additional hardware to ensure maximum throughput is achieved, if deemed required there will be no additional costs applied for this hardware.
Traffic is routed to take advantage of the full speed of each individual line.
Traffic is combined through our aggregator; this allows connection to continue even if one router fails.

Multi-Link Point to Point Protocol – Alternative Providers

Other bonded DSL solutions use multi-link point to point protocol (MLPP), creating a single PPP from multiple links.

Bonded DSL works by bonding up to 4 standard broadband lines together, creating a single virtual broadband connection to the internet for your business.


One specialist router is used, meaning single point of failure within the solution.
Traffic is capped to the lowest performing line so if it is a 2 line solution, the combined speed will be 2 x that of the lowest performing, as each line is equally weighted.
If a single link within the solution fails, connection has to be re-established to reinstate the failed line.

Multi-Link Point to Point Protocol – Alternative Providers

Load Balancing – this way of delivering Bonded DSL means multiple IPs, no overall speed gain and less resilience.

Physically Bonding Lines – Physically Bonding Lines – this way of delivering Bonded DSL sees bonding happening at a low level, two lines sync as one to give twice the speed. However, if one line drops, the connection may be lost and the solution may need to be reconfigured.

Q – How are the routers linked together?

Ethernet Switch
The recommended configuration for routers is using a switch. Each router should be connected to the Ethernet switch. All other devices on your LAN should also be connected to this switch.
This configuration means that the multiple routers can communicate with each other via the switch, allowing the Bonded DSL software to make use of all routers and route traffic according to individual line performance.

Q – With multiple routers how does it all work?

Computers on a network use a ‘default gateway’ address to route traffic to the internet. The default gateway is the LAN address of your router and is normally (or similar).
With Bonded DSL each router will have its own LAN address. In order for your LAN devices to route traffic properly, the group of routers become one ‘Virtual Router’. The default gateway then becomes the LAN address of the Virtual Router, normally (or similar).
If LAN devices are configured for DHCP (automatic IP setup), they will automatically pick up and apply these settings. However, if devices have to be configured manually, you will need to make sure they are using the Virtual Router as the default gateway and not an individual router in the group.

Your external internet IP is set and managed by the aggregation server.

Q – What hardware is provided with the Precept IT Bonded DSL solution?

Bonded DSL solutions from Precept IT are provided with the required hardware based on the estimated total speed of your Bonded DSL solution.
Hardware is provided to enable both the bonding of multiple broadband lines and the connection of these to the internet.

Q – What are the differences between an aggregated connection and other alternatives?


  Aggregated connection Other
Routers Hardware is provided to manage the bonding of the broadband lines and also to allow connection to these to the internet  An expensive specialist router is provided for the solution 
Latency Using an aggregator and routers, line latency is managed to provide consistency  With multiple lines, potential differences in performance lines have to be constantly managed to keep latency in sync – not a positive when lines are mis-matched 
Speed Line speed is not capped at the lowest performing line so you get the full speed of all lines (only a small % of speed is lost during the virtualisation process)  Lines are capped at the speed of lowest performing 
Resilience If one of the routers or lines fail, the others will continue to perform – only performance of the dropped line will be seen. One router so if it fails, connection is lost and the router has to be re-started. Depending on the set up, if one link fails, all connection could be lost 
Performance The full speed of all lines combined is provided (only a small % of speed is lost during the virtualisation process). 

One single IP address is applied


If one line drops during a VoIP call the call won’t be lost the aggregated link continues working


The platform continually monitors and adjusts for changes in line performance


Lines are controlled so all have to perform the same 

If line performance is mixed e.g. one stable, one unstable performance will suffer