Packet analysis

A Fast Analysis of TCP Fast Open

7 min read

Part 3 of our series exploring TCP examines the TCP “Fast Open” option and what to look for when troubleshooting TCP Fast Open (TFO) is an optional mechanism within TCP that lets endpoints that have established a full TCP connection in the past eliminate a round-trip of the handshake and send data right away. This speeds things up for endpoints that are going to keep talking to each other in the future and is especially beneficial on high-latency networks where time-to-first-byte is critical. Keep reading
TCP

Packet analysis

The TCP Timestamp Option

8 min read

We’re on a mission to tackle TCP, take it apart, and learn more about how it makes the internet work. Sample Captures Ahead! As always, we've gathered up the captures mentioned in this article into this collection over on CloudShark Did you know you can make collections just like this with CloudShark too? Learn more... Sample Captures Ahead! As always, we've gathered up the captures mentioned in this article into this collection over on CloudShark Did you know you can make collections just like this with CloudShark too? Keep reading
TCP

Packet analysis

TCP Window Scaling

8 min read

How Window Scaling keeps TCP moving at top speed Protocol choices made in older internet standards don’t scale to today’s network speeds. TCP (Transmission Control Protocol) has been making networks go for a very, very long time. As with many of the early internet protocols, limitations that seemed reasonable then can have a negative effect on performance now. Protocol designers allowed for future options to augment existing fields in order to keep them working effectively into the future. Keep reading
TCP

Packet analysis

The effects of traffic bursts on network hardware

5 min read

We’ve written extensively about the phenomenon of network microbursts and how to use the iPerf network performance tool to create them in order to test their effects on your network. Our interest in them grew out of our work with Velocimetrics, since microbursts can have pretty significant effects in financial/trade markets. Our journey down the rabbit-hole got us interested in seeing the effects of microbursts on switches and interfaces in a test network. Keep reading