Crazy about VMware SD-WAN

  The following Features will be discussed in this second part of my blog TCP Optimization Techniques Dejitter Buffering SAAS Application Monitoring   Before diving into the mechanism here an important basic fact:     Remediation is never done for applications classified as LOW priority     TCP optimization TCP has some embedded traffic management capabilities for reliable traffic delivery  (window.size, slow-start, RTT handling,...)  But there are a bunch of factors which can negatively influence the performance, like Latency TCP-slow-start Last Mile network problems Out of Sequence packets Busty losses end host TCP limitations (missing fatures like SACK, windows scaling or timestamp options)  Typically TCP optimization helps on the transmission side and improve the download time for large data transfers over latency-high and lossy WAN links. But it can also be used for improving perfomance when on the receiver side the amount ...

 In the last year I got quite deep insight into ther vendors SD-WAN implementation and also have seen what various vendors are critizising about the VMware DMPO features. Also there are a lot of misconceptions on the market around some of these features. So let´s try and evaluate and look a little bit deeper into typical performance features and the VMware implementation of them Features discussed in this Blog (Part 1) Per Packet Load Balancing Forward Error Correction (FEC) Packet Replication Latency Remediation The following Features will be discussed in Part 2 of my blog TCP Optimization Techniques Dejitter Buffering SAAS Application Monitoring   Per Packet Load Balancing  Unfortunately this term can be quite easily misinterpreted, when you Google for the term and get the following result:  This behaviour (often criticized by other vendors about VMware) as described above would only work quite well when you have very similar or equal connections. If for example 2 ...

Around 2 months ago when doing a Speedtest check of my links I experienced a substancial reduction of measured UPlink and DOWNlink speed. As I only have a single link to the Internet using Cable Modem connectivity which is a shared linktype, after some retries I assumed the problem to be at the Service Provider and some congestion there. I contacted the Service Provider but he assured me, that this is not the case. Then I found the real "culprit". It was my VMware SD WAN Edge which drastically reduced the bandwidth sent out via the Overlay. When checking the Edge I found out that the last measured Bandwidth was around 40/10 instead of 180/40 Mbps.   I was quite unsure about that measured  bandwidth and found out that according to this VMware knowledge base article ... ... on wired links the bandwidth test is only done when there is a Link Up event or after 7 days . So what seemed have happened was, that the last bandwidth measurement took place at a time, where due to s...