Mushroom Network

Virtual Leased Line


Mushroom Networks Virtual Leased Line (VLL) - Bonded Internet Pipe

The Virtual Leased Line (VLL) provides secure, fast and reliable office to office VPN connectivity between multiple locations via creating an IP tunnel that uses the bonded Internet access lines available on each side. VLL can enable a bonded Internet pipe between two office locations or between the office and its Internet Data Center via the Truffle customer premise equipments installed at the end-points. VLL can bond any type of Internet access line from any service providers including DSL, Cable, T1, E1, MPLS etc. without requiring any coordination with the ISPs. VLL IP tunnel supports star and mesh topologies for office to office VPN

Legacy VPN tunnel without Mushroom Virtual Leased Line

Head quarter with one leased line of 40Mbps and branch offices having ADSL connection of 40Mbps each. VPN Technology is used to connect between sites.


  1. There is a bottle neck at Head quarter due to all three VPN sharing leased line bandwidth of 40 Mbps (Each VPN tunnel bandwidth restricted to approx. 13.33). If a customer would like to increase the bandwidth of lease line the cost will be very high compared to adding additional ADSL connections which will be the case in Virtual leased line.
  2. No redundancy on the VPN tunnel. If the link is down; then VPN is also down or the customer must purchase another backup internet leased line at the cost of primary internet leased line to create VPN redundancy.

VPN with Virtual Leased Line using Mushroom Appliance

Replace existing devices with Mushroom and add backup line(s) in each location. This will give more bandwidth and redundancy for the tunnel.

In above figure, Head quarter has two 10 Mbps Leased lines and two 100 Mbps ADSL line; each branch has two 40 Mbps ADSL Lines.

Bonding is created on head quarter side with an aggregated bandwidth of 240 Mbps and each branch will get 80 Mbps. Each VLL tunnel bandwidth will be 80 Mbps.


  1. More tunnel bandwidth (From 13.33Mbps (Figure 1) to 80 Mbps (Figure 2)) and hence no bottleneck.
  2. Redundancy for the tunnel. In case of one link failure, traffic will be redistributed using available access line.

Features and Benefits

Quick Return on Investment (ROI)

Virtual Leased Line provides a quick Return on Investment (ROI) and lower operating expenses as an alternative to T1 based point to point leased lines. VLL IP tunnel can be used in conjunction to MPLS or as an alternative to MPLS. The total subscription costs of multiple broadband Internet access lines are often substantially less than a single high-speed Internet access line of equivalent bandwidth. The payback period on the investment is often measured in months.

Link Failure Recovery

n case of Internet access line failures in one of the Internet access lines within the IP tunnel, Virtual Leased Line (VLL) recovers the ongoing session by redistributing the load over the available access lines, even for the sessions in progress, without loss of data integrity. This means your office to office VPN will be kept alive even during individual WAN failures.

Transparent Installation

The existing Local Area Network in the head-quarter office or the branch office/colo does not require any changes. All the installation and configuration is handled through the BBNA user interface

DNS Load Balancing for Inbound Requests

TRUFFLE BBNA can be easily configured to provide Dynamic DNS load-balancing for inbound requests for internally hosted servers such as web-server, ftp-server, mail-server etc.

Aggregated Point-to-Multipoint Capacity

Truffle can peer over the Internet with other Truffle devices that has VLL server license (such as a head-quarter office and the branch offices) to create an IP tunnel for office to office VPN. In this peered mode, all uplink and downlink traffic between the head-quarter office and branch office/colo location(s), including VPNs, will use the aggregated bandwidth of the combined Internet access links.

Improved Network Reliability

Automatic failover protects against failures of one or more access link outages, as it will not cause failure of the aggregated access link as long as at least one access link is still active, resulting in less downtime for the connection between BBNA devices.

No Coordination with ISP

No new equipment or software is necessary from the Internet Service Provider(s). A user-friendly web-based management interface is provided for quick and easy configuration and system monitoring.

Additional Features

DHCP server (can be turned off), state-full firewall (can be turned off), port forwarding, DMZ, UPnP support and others.