Srivats P

It took me a bit of time and effort to figure this out, so thought I’d post it for other people’s benefit (and for future-forgetful-me!).

Linux virtual-Ethernet (veth) interfaces are quite useful for a variety of purposes - for me, that’s to test Ostinato.

Back in Feb, as I was telling yet another customer that the easy way to start with Ostinato Python API is not to write python script from scratch, but to save your streams as a python script from the GUI, I remembered that python code is generated only for

Recently I was doing some work to add support for Lua scripting to the Ostinato network traffic generator.

Ostinato uses the QtScript module to support custom protocol userscripts.

The backstory Watch the video first!

A few months ago an Ostinato customer reported the Ostinato GUI crashing when importing a large PCAP file (~600MB).

The Problem Back in 2020, Javor wanted to test 2 million CGNAT scale using Ostinato but was running into a problem generating the flows he wanted.

Back in May, I implemented Transmit Duration in Ostinato.

Most desktop apps have a main window with one child window which displays the document surrounded by toolbars, toolboxes and palettes.

The Ostinato latency and jitter feature sends a timing tagged (TTAG) packet roughly every 5 seconds.

As a product creator with an engineering background, I’m always trying to learn more about good marketing.

Recently, Ostinato customer Barry sent me this email - I want to generate RARP request packets.

Happy New Year!

Close on the heels of releasing Ostinato v1.3.0, I discovered a regression - the Show Reserved Ports Only feature is broken.

Like most products, the number of new features requested for Ostinato is long.

Recently Ostinato user Ezra gave me some feedback about the Ostinato Port Stats UI - I find it very unreadable when for every parameter there is Rx and bellow Tx.

Ostinato user Leslie reached out to me to report that Ostinato per-stream stats are not working on the RX side (always 0) with VLAN-tagged packets on Ubuntu 22.04 LTS.

For a long time now, I’ve been wanting to package Ostinato as a container.

A few days ago, Ostinato user João reached out on Twitter and requested for a way to distinguish between SVLAN and CVLAN fields for a VlanStack protocol when trying to configure the vlan field to vary across packets.

It’s been more than 2 years since the last Ostinato release - v1.1.

I’d heard about mininet off and on, but had never really tried it myself.

Amongst mostly positive Ostinato reviews on Capterra, Ostinato user Tamás mentions that the Ostinato UI looks “old school”.

Ostinato has supported importing and exporting PCAP files since 2011.

A popular use case for Ostinato is to import and replay PCAP (packet capture) files - and that’s one reason why Ostinato is Wireshark in Reverse!

I have always written quick ‘n dirty scripts and small utilities for myself, all through my career and even earlier in college.

Ostinato can craft packets and generate network traffic for various protocols at various packet sizes.

Earlier this year I gave a talk at FOSDEM 2021 on how to add more protocols to the Ostinato traffic generator.

A decade or so ago, virtualization took the world by storm and that introduced multiple L2 tunneling encapsulations such as VxLAN, NVGRE and STT.

It’s been almost a year, but I just realized that I hadn’t posted about my Ostinato talk at Sharkfest 2020 here on my blog.

This post is written for EVE-NG.

Did you know that you could generate application traffic using Ostinato to test your SDWAN and application aware routing deployments?

A few weeks ago, Ostinato user Peter asked me - I basically want to send traffic at different traffic % load for a specific interval of time. 10 seconds 10% 1G, 10 seconds 20% 1G, through 10 seconds 90% 1G and then back down to 10% and repeat.

In the previous post, I talked to Graham Cassells - a Cisco Networking Academy teacher in Australia, who is using Ostinato in his classes.

Graham Cassells is a CCNA and teacher of networking and cyber security at high schools and TAFE (vocational training for adults) for the last 20 years.

In Ostinato version 1.0, I added a Logs window to the UI so that errors/warnings could be notified to the user.

Recently, Ostinato customer Javor reached out to me and wanted advice on how to configure traffic stream(s) to test 2 million NAT sessions.

I’ve spent the last few weeks implementing cut-copy-paste in Ostinato.

In the last few weeks, I added cut, copy, paste support in Ostinato.

Based off a conversation with a friend -

There have been indications (and some direct feedback) that there isn’t enough documentation about Ostinato and it’s various features.

My friend P S Nissim self-published a Kindle short - Brown Boy back in 2017.

This post was originally published in Sep 2011 at the Inficone, but that site is now off the Internet; so reposting it here.

This post was originally published in Nov 2011 at Love My Tool (rebranded as Network Data Pedia recently), but is no longer available there; so reposting it here.

Update (2021): Ostinato now supports 10G, 25G and 40Gbps line-rate rate traffic using the Turbo Transmit add-on.

The Ostinato virtual appliance has two boot options - Boot Ostinato (Agent + Controller) Boot Drone (Agent only) Boot Ostinato is the default and therefore is selected and if you don’t change it within 30s, the boot proceeds with the same.

No, this is not about the cookery reality TV show.

The Ostinato API tutorial configures a single stream to send 5 packets then sleeps for 7 seconds - assuming transmission would have finished by then - before fetching the tx/rx stats for verification.

Ostinato has a controller-agent architecture that uses a TCP connection (on port 7878 by default) for communication between them for command and control.

A cover of Paul Buchanan’s Mid Air Piano and vocals: Srivats P.