The Impact of ICMP Redirects
One of my readers sent me an interesting question after reading my ICMP Redirects blog post:
In Cisco IOS, when a packet is marked by IOS for ICMP redirect to a better gateway, that packet is being punted to the CPU, right?
It depends on the platform, but it’s going to hurt no matter what.
Read more ...Technology Short Take #72
Welcome to Technology Short Take #72. Normally, I try to publish these on Fridays, but some personal travel prevented that this time around so I’m publishing on a Monday instead. Enough of that, though…bring on the content! As usual, here’s my random collection of links, articles, and thoughts about various data center technologies.
Networking
- Charles Min-Cheng Chan has a write-up on using IPv6 in Mininet.
- How’s this for Technology Short Take inception—in TST #70, I mentioned the Cumulus topology converter. That prompted Cody Bunch to write this article on setting up a topology with BGP on Linux using the topology converter, which I’m now mentioning in this Technology Short Take. (Does your head hurt yet?)
- PowerShell on Cumulus Linux on a network switch? Pete Lumbis shows you how. (There are some very interesting implications around this combination, but I’ll reserve that for a future discussion.)
- Someone pointed me toward this article on using Sophos UTM for remote access to their home lab.
- Lindsay Hill recently took Simon Wardley’s pioneers/settlers/town planners (PST) model—which is itself based on Cringely’s Accidental Empires book and the commandos/infantry/police model—and applied to it the networking industry. It’s a really good read and Continue reading
OSPF Multi-Area Adjacency | OSPF Area Placement | RFC 5185
OSPFv2 by default setup only one adjacency over a single link. But this can be an issue some time and as a network designer you should understand the consequences and know the available solutions. Placing a link in wrong OSPF area can create an OSPF sub optimal routing especially in hub and spoke topology. In […]
The post OSPF Multi-Area Adjacency | OSPF Area Placement | RFC 5185 appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
IS-IS Design considerations on MPLS backbone
IS-IS Design considerations on MPLS backbone Using IS-IS with MPLS require some important design considerations. IS-IS as a scalable link state routing protocol has been used in the Service Provider networks for decades. In fact, eight of the largest nine Service Providers use IS-IS routing protocol on their network as of today. If LDP is […]
The post IS-IS Design considerations on MPLS backbone appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Docker Weekly Roundup | October 2, 2016
This week, our readers enjoyed some big Docker news, including the release of InfraKit, a toolkit for declarative infrastructure, a Windows 10 container guide, and a new open source project Image2Docker. As we begin a new week, let’s recap our top 5 most-read stories for the week of October 2, 2016:
- InfraKit is a new declarative management toolkit for orchestrating infrastructure. InfraKit’s simple, pluggable components for a declarative infrastructure state, actively monitor and automatically reconcile that state.
- Windows Server Container guide is designed to get setup to run Docker Windows Containers on Windows 10 or using a Windows Server 2016 VM.
- Docs Repo On GitHub is a consolidation of all Docker documentation into a single Pages-based repository on GitHub. All documentation for Docker projects will now be open sourced for an easier than ever way to contribute to and stage the public docs.
- Image2Docker is a new tool for prototyping Windows VM conversions to show how to replicate a VM Image to a container. The Powershell module can point at a virtual hard disk image, scan for common Windows components and suggest a Dockerfile.
- Docker Compose Story is a tool for defining and running your multi-container Docker applications. Applications Continue reading
TCP Protocol: Slow Start
In the last post we explained the basic idea of using sequence and acknowledgement numbers to track how many bytes were sent and received. We also has encountered the term “slow start” and elaborated how TCP uses this concept on the server to send few segments of data to the receiver instead of sending the full …
The post TCP Protocol: Slow Start appeared first on Networkers-online.com.
Thoughts on Theft
It’s been a busy week for me. In fact, it’s been a busy few weeks. I’ve had lots of time to enjoy NetApp Insight, Cloud Field Day, and Storage Field Day. I’ve also been doing my best to post interesting thoughts and ideas. Whether it’s taking on the CCIE program or keynote speakers, I feel like I owe a debt to the community and my readers to talk about topics that are important to them, or at least should be. Which is why I’m irritated right now about those ideas being stolen.
Beg, Borrow, and Steal
A large part of my current job is finding people that are writing great things and shining a spotlight on them. I like reading interesting ideas. And I like sharing those ideas with people. But when I share those ideas with people, I make absolutely sure that everyone knows where those ideas came from originally. And if I use those ideas for writing my own content, I make special care to point out where they came from and try to provide the context for the original statement in the first place.
What annoys me to no end is when people take ideas as Continue reading
CTO Singh Becomes the Latest Exec Departing Cisco
One of Chuck Robbins' own recruits joins the exodus.
AT&T Will Launch ECOMP Into Open Source in 2017
The Linux Foundation will host ECOMP as an open source project.