There hasn’t been a time where the applications running on Internet have been changing so rapidly. Applications are moving to public and private clouds, fast — putting growing pressure on the Internet performance, more specifically the WAN segment of the Internet that services the end-users. This applies both for consumer Internet services as well as enterprise WAN services. Historically, the solution has been a load balancer. How is that requirement evolving?
This accelerated change in requirements need to be matched by the next generation of Internet load balancer, which are the maestro between the Internet and the local LAN. The legacy load balancing approaches where all traffic is treated mostly the same way, i.e. not taking advantage of the intelligence that can be extracted from the WAN links, is not a par with today’s application demands. Historically load balancing firewalls would not have the flexibility to react to any changes in the network conditions once they blindly commit a flow to one of the WAN ISP links. Let’s say a chatty application flow was assigned to one of your WAN lines, say WAN1. If your WAN1 experiences a performance anomaly, and believe me any service will no matter what the SLAs are, the flow that was assigned to that link will suffer. In reality any WAN link is a unpredictable animal that has floating specs (depending on the traffic on the link, time of the day, core network congestion or hundreds of other potential reasons), so the WAN load balancer should be able to detect, understand and accordingly react to those performance fluctuations in the Internet.
These type short-comings of legacy load balancing routers are primarily a result of the large granularity that a load balancer uses, which is at a level of transport session (TCP session, UDP session, SIP session etc). However, the new breed of link load balancers, more accurately named Broadband Bonding routers are capable of reducing the granularity to (or even below) an IP packet. This enables tremendous flexibility to react quickly to any changes in the network. The 25+ years of theoretical work of Network Calculus provides the foundation of this approach. Once the granularity and adaptation is within reach, the load balancer should virtualize the WAN (WAN virtualization) that creates an intelligent software layer that manages the Internet traffic across all WAN links. Think of this as a traffic cop that can direct the packets to different WAN links dynamically according to the overall view of the roads and traffic.
The legacy load balancers need to evolve to a new generation of load balancers to be able to serve the ever changing needs of the new applications and cloud based paradigm. Being able to detect, classify, react in real-time is no longer a luxury for high-end technologist but a requirement of any multi-WAN appliance (e.g. dual WAN firewalls) to provide the best end-user experience.
Cahit Akin, CEO, Mushroom Networks, Inc.
Mushroom Networks is the provider of SD-WAN (Software Defined WAN) and NFV solutions capable of Broadband Bonding that enables self-healing WAN networks that route around network problems such as latency, jitter and packet loss.
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