DSR - Why we think direct server return is worth its own showcase.
Layer 4 vs Layer 7 load balancing - we still love DSR, but…
Direct server return, direct routing - no matter what you call it, using DSR maximises the throughput of return traffic and allows for near endless scalability. Here's why we still love it.
15 years later, we still love DSR
Some relationships fizzle out over time. You know how it goes - you change, you start fighting, you grow apart. But fifteen years on, Loadbalancer.org’s love affair with Layer 4 DR mode is still going strong. For the uninitiated, Direct Server Return (DSR/DR/N-Path) is a clever
Direct Server Return (DSR) is simply awesome - here’s why...
Direct Server Return (DSR) is my favorite way to load balance application servers because it’s simple, transparent and super fast. Direct server return would seem to be a mode that has fallen out of fashion, in fact most application delivery vendors seem to hate DSR mode. Vendors often write
Yahoo’s L3 Direct Server Return (DSR), an alternative to LVS-TUN, explored.
I had the opportunity to play with Yahoo’s implementation of L3 DSR using LVS and iptables, it was great fun so I thought I had better write a blog on using it. So, what exactly is L3 DSR and why should I care when I already have LVS-TUN? L3
Layer 4 Direct Routing (LVS-DR) and Layer 4 TUN (LVS-TUN) in AWS
Have you ever wondered if LVS works in AWS? I can already say for certain that LVS-NAT works great - but what about LVS-DR and LVS-TUN? Having spent the last several months playing in AWS, I'm writing this blog mostly to record my findings. I was trying to get LVS
Load balancing an internal web server behind two Microsoft TMG 2010 servers at layer 4 using DR mode
We were looking at Microsoft's new TMG server and load balancing and after a search of the web found there was not really any Guide on how to load balance incoming web connections via two TMG servers to an internal NAT'ed web sever at Layer 4. The TMG servers are
Load balancing Microsoft Print Server
Microsoft Print Server provides a great way to share printers throughout your organisation, but when the print server falls over, the phone quickly starts to ring. By adding a load balancer and a second print server configured with the same print queues, you'll quickly have a load balanced and resilient
Load balancing via Direct Routing has several key advantages over NAT based methods
One of the (many) traditional problems with load balancing is the requirement to change your infrastructure in order to implement a hardware load balancer. Traditional DNS based round robin was easy as you just added extra IP addresses to your A record, but when using a hardware load balancer you
Direct Routing aka. Direct Server Return - How to solve the ARP problem on Windows Server 2016
Direct Routing aka. Direct Server Return (DSR) aka. N-Path is a great load balancing method. And it is without doubt the fastest method possible. So, how does Direct Routing work? First, the incoming traffic from the client hits the Virtual IP (VIP) on the load balancer. Then the load balancer