Fragmentation

One of the more difficult design exercises in packet switched network architectures is that of the design of packet fragmentation. In this article I’d like to examine IP packet fragmentation in detail and look at the design choices made by IP version 4, and then compare that with the design choices made by IP version 6.

Gopaddle Meetup Bangalore – CI, CD Presentation

Following link captures the slides on CI, CD with Docker, Jenkins and Tutum that I presented at GoPaddle meetup, Bangalore on January 23, 2015. You can find more details on the meetup here. In this presentation, I cover the following: Overview of Continuous Integration(CI), Continuous deployment(CD) Tutum Overview Jenkins with Docker Integration CI, CD Use cases … Continue reading Gopaddle Meetup Bangalore – CI, CD Presentation →

CI, CD with Docker, Jenkins and Tutum

In this blog, I will give an overview of Continuous Integration (CI) and Continuous Deployment (CD) and cover few CI, CD Use cases with Docker, Jenkins and Tutum. Docker provides Container runtime and tools around Containers to create a Container platform. Jenkins is a CI/CD application to build, test and deploy applications. Tutum is a SaaS … Continue reading CI, CD with Docker, Jenkins and Tutum →

Syncing IOS Clock from Cellular Provider

I recently had a request to enable time synchronization from a Cellular provider to a 3G model of the Cisco 819. Looking through several documentation sources, I found an example of EEM policy utilizing GPS data in this manner.

LTE GPS Antenna Guide Cisco Integrated Services Router (ISR G2) and Connected Grid Router

After looking at the TCL script outlined in the above document, I thought it would be an easy modification to achieve this result with the cellular network data. After fighting with the script and EEM policy for a couple of hours, I stepped back and looked at the options for creating an EEM Applet. My goal was to achieve similar results but utilizing the time provided by the cellular carrier. This article outlines my process and the final configuration.

The source of the data that I wanted to use was derived from the show cell 0 network command.

CiscoRTR#show cell 0 network
Current Service = 1xEV-DO (Rev A) and 1xRTT
Current Roaming Status(1xRTT) = HOME, (HDR) = HOME
Current Idle Digital Mode = HDR
Current System Identifier (SID) = DDDD
Current Network Identifier (NID) = DDD
Current Call Setup Mode = Mobile IP only
Serving Base Station Longitude =  Continue reading

Pop Up Tech Talks: Denise Fishburne

Earlier today I saw a tweet that @PopUpTechTalks had uploaded their interview of me up to their YouTube Channel.  I was super stoked!  :)  Just had to share it with y’all!

SolidFire’s Amy Lewis speaks with Cisco’s Denise Fishburne aka Fish about embracing your inner network detective at Cisco Live 2015. Filmed June, 2015 in San Diego.

Click on the pic below to see watch the interview.

popuptechtalk

Dell OS10 SDN router demo


In this video from Dell's Network Field Day 11 (#NFD11) presentation,  Madhu Santhanam demonstrates an interesting use case for the new OS10 switch operating system that was introduced at the event.
The core of OS10 is an unmodified Linux kernel with an application development environment for Control Plane Services (CPS). These APIs allow software running on the switch: native linux applications, third party applications, and native OS10 applications to run on the core OS10 operating system.
The FIB Optimization application consists of three components: an sFlow agent to provide network visibility, Quagga for BGP routing, and the Selective Route Push agent which provides a REST API for selectively populating the hardware routing tables in the switch ASIC. The FIB Optimization application allows an inexpensive data center switch to replace a much more expensive high capacity Internet router.
In this use case, the data center is connected to a single transit provider and multiple additional peer networks. Initially all traffic is sent via a default route to the transit provider. The full Internet routing table consists of nearly 600,000 prefixes - far too many to fit in the switch hardware forwarding tables which in typical low cost switches can only handle Continue reading

New tool from Cloudmark is designed to defend against spear phishing  

This column is available in a weekly newsletter called IT Best Practices.  Click here to subscribe.  The nature of how cyber attacks start is changing. Today's malicious actors are not merely opportunistic, they know what information they want and who to target to get at it. For example, the 2014 breach at JP Morgan reportedly began when an IT employee opened a specially-crafted email and was tricked into providing credentials to a vulnerable internal machine. Attackers used the privileges of that person's credentials to move around the network until they were able to find and exfiltrate 83 million records in one of the largest data breaches of the year.To read this article in full or to leave a comment, please click here

CIA: 10 Tips when investigating a flying saucer

Most people don’t typically associate the Central Intelligence Agency with historical UFO investigations but the agency did have a big role in such investigations many years ago.That’s why I thought it was unusual and kind of interesting that the agency this week issued a release called “How to investigate a flying saucer.” [The release is also a nod to the fact that the science fiction TV series X-Files returns to the screen this weekend]In the article the CIA talks about the Air Force’s Project Blue Book which investigated public reports of UFOs and operated between 1952-1969.   Project Blue Book was based at Wright-Patterson Air Force Base near Dayton, Ohio. Between 1947 and 1969, the Air Force recorded 12,618 sightings of strange phenomena — 701 of which remain "unidentified.”To read this article in full or to leave a comment, please click here

Skype now hides your IP address to protect against attacks from online trolls

Skype is adding a new default security feature primarily to protect gamers from their overheated rivals. The Microsoft-owned service recently announced it would start hiding users’ IP addresses by default in the latest update to Skype. Previously, a Skype user’s IP address was not hidden, meaning hackers who knew what to look for could easily obtain your IP address and thus target your computer. Why this matters: Online gaming is serious business. So serious that people who lose major online battles or matches can sometimes seek revenge. One easy way to do that is to launch a distributed denial of service attack knocking their victorious rival offline. Before launching a DDoS, however, you need your target’s IP address. That was actually pretty easy if you knew your target’s Skype name. You don’t even need to be a capable programmer as many websites called ‘resolvers’ promised to reveal a Skype user’s IP address.To read this article in full or to leave a comment, please click here

1 … 3,185 3,186 3,187 3,188 3,189 … 3,856