routerjockey

Stop using 192.168.1.0/24: A Contrarian Guide to Home Network Addressing

If you’re a contractor, consultant, or anyone who VPNs into multiple client networks, you’ve experienced the pain. You connect to a Client’s VPN, and suddenly you …

Debating SSL Decryption in 2024

Yet another day brings another meeting about another security product recommending SSL Decryption at our network edge. Your Intrusion Prevention System (IPS), your web filter, the …

Engineering a Better Blog: Our Move to Hugo

Routerjockey has transitioned to Hugo, a fast and flexible static site generator. Hugo utilizes a straightforward, markdown-like syntax for content creation, and has a robust …

Cisco Viptela drops the ball

In 2012, we saw the launch of Viptela, a pioneer in SDWAN network solutions. While they weren’t the first in SDWAN, I believe that badge goes to Talari; Viptela was the …

Will 2023 be the year of Artificial Intelligence for InfoSec?

Gartner has been saying that “next big thing” in network security is the increased use of artificial intelligence (AI) and machine learning (ML) technologies for years now… Mainly …

Introducing Graphiant: The Future of Network-as-a-Service

As businesses continue to shift towards remote and distributed work environments, the need for secure and reliable network infrastructure has never been greater. Enter Graphiant, a …

Mandatory Cisco DNA Licensing – is this the Future??

With the release of the new 9200 series switches many enterprise organizations are starting to look towards the future. Cisco has also been looking towards the future… of their …

AIOps the next big thing for Enterprise IT?

But how does all of this relate to IT Infrastructure and Operations? AIOps is the combination of AI and IT Operations. And while the IT community hears the AI related buzzwords, …

Gartner – more than a magic quadrant

In the past I have personally given a lot of flack towards Gartner, but that was when I was in a different stage of my career. Over the past two years I’ve transitioned into …

PCAP PCAP PCAP – Changes to RJ Store

I made a couple changes to the RouterJockey store this week and I wanted to make sure I got the word out. Previously the store worked in sprints that I tried to open up 2-3x a …

IP Infusion powering the world from behind the scenes

Founded by Kunihiro Ishiguro and Yoshinari Yoshikawa the founders of GNU Zebra, came together to form IP Infusion back in 1999 as a commercial-grade, hardware-independent …

VMware NSX is something something awesome

At times I have trouble focusing on writing articles for some of the presentations I am exposed to at Tech Field Day. Because of that, I really wanted to try something different. …

PCAP t-shirts just in time for CLUS17

Hey guys, I just wanted to drop a quick note to let you know that I’ve relaunched my teespring shirt campaigns with enough time that you should get your orders before Cisco Live US …

PNDA provides scalable and reactive network analytics

During Networking Field Day 15 our friends from the Linux Foundation, including Lisa Caywood, briefed us on a recent “acquisition” from Cisco. PNDA (Panda) is an open source …

Networking Field Day 15 – A new delegate emerges

Yet again I find myself honored, and questioning their selection methods, by being selected for a Networking Field Day event. Networking Field Day 15 kicks off April 6 and 7th in …

Ixia Vision ONE – Tap the Planet

Whenever I start talking about network visibility and aggreagation taps I can’t help but think of The Matrix. Millions of packets flowing through your network every minute of every …

Forward Networks – A forward approach to formal verification

Forward Networks has stepped out of the shadows to announce their Network Assurance platform, and I was fortunate enough to be a delegate for Networking Field Day 13 to see their …

Intel Atom SoC bricking more than Cisco products

Looks like the culprit in the recent Cisco debacle is the Intel Atom “System on Chip” (SoC) that Cisco used in it’s gear. My sources within Cisco won’t give up the goods, but many …

Cisco goes public with Clock Signal Component Issue

A couple months ago many engineers started hearing rumors regarding an ISR 4331 recall, and problems surrounding the device. Until this week, none of us had very good information, …

Networking Field Day 13 – Sneak Preview

This is going to be a busy week for the Tech Field Day family. They have delegates en-route to Tech Field Day 12 this morning, and Wednesday the crew for Network Field day 13 …

5 important reasons you should learn scripting

Today’s IT landscape if full of software defined marketecture, and lore of a dystopian future full of network engineers that do nothing but write code. But in reality, there are …

The complexity required for robustness, often goes against robustness

In the past few months we have seen major outages from United Airlines, the NYSE, and the Wall Street Journal. With almost 5,000 flights grounded, and NYSE halting trading the cost …

Site Upgrades for September 2015

First, I want to apologize for not doing my job. Over the past couple years I’ve let this site become slightly stagnant. I won’t attempt to make excuses, but I will say that I’m in …

RouterJockey is launching a clothing line?!?!???

Ok maybe that title is a bit grandiose… But due to the great response I received Friday morning from the launch of the original PCAP shirt, and the IPv6 follow-up, I decided to …

PCAP or it didn’t happen…. The t-shirt!

Some days I don’t know why I do things… But last night I was playing around with creating a PCAP meme when my friend Josh Kittle said he’d be interested in a t-shirt like that. I …

ASA v9.4 Elliptic Curve Cryptography with TLS1.2

With ASA version 9.4 Cisco has added support for Elliptic curve cryptography (ECC), which is one of the most powerful types of encryption in use today. While ECC has been in use …

Well-Known Intervals

Listed below are many events which occur on network devices at well-known intervals. The list is provided to serve as an aid while troubleshooting recurring network disruptions. …

FCC approves net neutrality rules, reclassifies broadband as a utility

Today is a good day. By a 3-2 vote, the FCC has voted to adopt net neutrality rules to protect the open Internet. This plan will reclassify internet access as a Title II public …

Cisco Live 2015 – Mike Rowe Announced as Keynote Speaker

Cisco just announced to the Cisco Champion community that the guest speaker for the keynote is going to be none other than …… Mike Rowe!! In case you don’t know, Mike Rowe is an …

BGP Communities

Tony Mattke
Routing
4 min read

BGP Communities has to be one of my favorite features added to the BGP protocol. As you should know by now, BGP passes several attributes between peers that help influence the BGP …

Cisco Live 2015 – Customer Appreciation Event Featuring Aerosmith!!

Yes, you heard me right. Aerosmith! One of the most looked forward to social events for Cisco Live has always been the Customer Appreciation Events (CAE). Cisco rarely let’s us …

Binary Metal Guitar

Thank you Ed for sharing the video the led me to find this video. It's a national treasure for those of us that appreciate binary. And if you appreciate metal, or music in general …

Cisco VIRL released into the wild

After much waiting from all of us, Cisco has released, on “cyber Monday” no less, VIRL. As you may remember, VIRL was the talk of CLUS 2013, and many of us have been eagerly …

The Unofficial JNCIE-ENT Prep Guide

Some of you may have heard that Jeff Fry has published his Unofficial JNCIE-ENT Prep Guide, but how many of you have purchased it yet? I’ve had the opportunity to look it over as …

AS-Path Filtering

Tony Mattke
Routing
4 min read

Before we get into the how, let’s talk about the why. According to the CIDR Report, the global IPv4 routing table sits at about 525,000 routes, it has doubled in size since mid …

Network Design — Keeping it simple

Since the dawn of time people have skirted best practice and banged together networks, putting the proverbial square peg in the esoteric round hole. For example, new vendor XYZ’s …

Cisco ISR 4000 – Now with more licensing!

This week at Interop NYC, Cisco launched it’s ISR 4000 Series. This is a new approach for them focused on delivering services to your branch offices. Cisco has dubbed this new …

HP talks SDN at Interop NYC 2014

I generally try to avoid oversharing when it comes to my thoughts about presentations, but I have to mention that after sitting down with Glue Networks and their “SDN” …

Installing VMware tools on Cisco ACS

As of ACS v5.4 Cisco has finally included VMware tools for their ADE OS. Unfortunately, when you upgrade, they do not get installed automatically as the installation is triggered …

Using Deny ACEs in your PBR ACL on your Nexus 7k

Quite a while ago I had a need for some network duct tape… Policy Based Routing while useful should only IMHO be used as a temporary fix. But as you know, temporary things soon …

Vendor PSA: Words and Phrases to Avoid in Presentations

Over the years IT professionals have sat through countless presentations, conference calls, and keynotes. We’ve been preached too, explained “the problem”, and forced to bear …

Cisco ASA Packet Captures for Fun and Profit

As many of you know my background isn’t in enterprise, but I currently fill that role in my $job. In order to succeed I’ve had to develop many new skills including …

Fixing iMessage on Hackintosh

Mid December 2012 Apple shut down the Messages Beta for Lion, soon after many hackintosh users started noticing issues with signing into iMessage. At some point in time, people far …

Double NAT – Cisco ASA 8.4+

Recently I was faced with an issue outside my normal expertise… those of you that know me realize I am anything but a security engineer. But in reality, you must always expand your …

Vim Primer for Network Engineers

Vi is arguably the best text editing software in the world. There, I said it… deal with it! It should be noted that while many people continue to refer to Vi simply as such, Vim …

Cisco Nexus 2000: A Love/Hate Relationship

My feelings towards the Nexus 2000 Fabric Extender (FEX) are hardly a secret. The myriad of design choices and platform limitations present engineers with some rather difficult …

CCIE Potential

INE published a great info-graphic on the earning potential of Cisco’s certifications and I felt the need to share it here. It covers a range of topics from average salaries on all …

QinQ: IEEE 802.1Q Tunneling

In situations where service providers want to offer transparent LAN services that preserve a customers VLAN tags across your Layer-2 network, this amendment to the IEEE 802.1q …

Cisco IPS Fun

Since I’ve recently had some fun working with the Cisco 5585-X and the IPS blades, I wanted to document some of the information I learned while getting them online. Some of this …

Another Wicked Vim Tip

As a follow up to my blog post covering Vim on the PacketPushers blog, I wanted to share with you another time saving tip for getting our jobs done not only quickly, but helping to …

MDS Fibre Channel Switching Basics for Network Engineers

Recently I’ve been lucky enough to be challenged with learning a bit about Fibre Channel Switching, but I’m even luckier in that I’m getting to know it on a set …

Brocade and VCS… quite impressive

Our second visit on day 2 of Network Field day was Brocade, who incidentally supplied us with a great lunch! We spent a little time going through the expected marketing …

Juniper QFabric, Junosphere, Automation, and More

The second day of Network Field Day 2 started early at the Juniper EBC, luckily Abner Germanow was prepared with breakfast for the weary and slightly hung over delegates. He gave …

Gigamon and the Great Pumpkin

I could’ve just as easily called this article Gigamon… fixing problems you didn’t know about or Why Gigamon scares the crap out of me — but I wont, because they already did! But …

NEC and ProgrammableFlow Switching

NEC is currently the only Vendor that is shipping an OpenFlow enabled product today. So naturally, their presentation led off with a message about what they’re bringing to the …

Network Field Day 2 — Comic Edition

During the coarse of NFD2 I found an iPhone app called Halftone, and later, one named ComicStrip that allow you to add some fun effects and speech bubbles to your photos… So, I …

Cisco Systems Awesomesauce aka Full Tilt Boogie

First of all, I want to say thank you to everyone from Cisco Systems for inviting us into the CCIC (Cisco Cloud Innovation Center), this was an amazing room to hold our …

The OpenFlow Symposium

Well, here is the update that I promised you. I’ve spent the last few days with some of the top minds in Networking industry. One of the most exciting technologies being presented …

Tech Field Day: OpenFlow Symposium

What is OpenFlow? OpenFlow is a proposed standard for exchanging flow data between controllers and networking devices. OpenFlow has the potential to move our networking control …

BPDU the next incrementation

As I feel this may be a regular section of the blog due to my lack of availability. Please suggest a better name for this “series”. I would certainly appreciate it, as would my …

Networking Field Day 2

Have you heard the news? You’re least favorite blogger is making the trip to San Jose California for Tech Field Day: Network Field Day 2 — I really want to add a dramatic movie …

SNMP can save your life

Ever get locked out of a router or switch that is many hours or even days away? Recently, I had the pleasure, again. For some reason, be it the consultant that was turning up our …

BPDU – Blog Post Data Unit?

My most recently collection of interesting bits of data found out on the blogsphere/internets. Due to my lack of time, I’ve decided to recycle what I find out on the ‘net and share …

Best Practices and Securing Cisco IOS

Everyone has different views on hardening IOS, and while I do not claim to be an expert, these are the practices that I commonly use when bringing up a new device. If you see …

Network Duct Tape Gone Wrong

As many of you may know, I’m in the middle of a huge network redesign, last week our new firewalls finally arrived and it became time for us to start migrating services onto the …

F5’s iRules — My first look

I’ve never had the opportunity to really do much with F5 load balancers in the past, but recently one our system engineers needed some load balancing setup, and wanted to know if …

Nexus 7000 vPC Features

Next generation data centers across the world are taking advantage of Cisco’s Virtual PortChannel. As of recent, I’ve moved our core to a pair of Nexus 7010s running …

NX-OS 5.2(1) for the Nexus 7000

Rather quietly, at least I never heard anything, on July 29th, Cisco released NX-OS Version 5.2(1) for the Nexus 7000 platform. (and the world rejoiced) This long awaited revision …

Cisco Increases CCIE Lab Cost

This morning several CCIE candidates received an email stating that on August 1, 2011, Cisco will be raising the cost for the CCIE lab from $1,400 to $1,500. This is an interesting …

Cisco Live 2011

It’s been a tough week since I left Las Vegas. I must say that my Cisco Live withdrawal has been pretty bad, and with the week we’ve been having here in Indiana, I’m certainly …

My Toolbag

Following the current popular topic of “Whats in your toolbag?” ala Stretch and Fryguy. I’ve decided (after some persuading) to detail the contents of my own bag. Without further …

IP SLA Basics

IP SLA is a function of Cisco’s IOS enabling you to analyze a Service Level Agreement (SLA) for an IP application or service. IP SLAs use active traffic-monitoring to continuously …

My Cisco Live 2011 Schedule

I finished up most of my registration for Cisco Live 2011 / #cl11 yesterday and figured I would put up a copy of my schedule. My only wish would be that there was more times …

Time-based ACLs

Ever since Cisco released IOS 12.0.1T we’ve had the ability to broaden the reach of the extended ACL to allow the influence of time. Time-based ACLs reference a time range that is …

Remote Configuration Tip

I got asked a rather interested question the other day. An engineer needed to make remote configuration changes to a router, but do the commands he needed to run, he would be …

IP Multicast Routing Concepts

Tony Mattke
Routing
6 min read

Can you imagine a video conference taking place on a primarily T1 based WAN? Multiple copies of the same video stream being unicast from the host to each participant. Multiple …

Public Service Announcement for Engineers

We all know how stressful our jobs can be. And we certainly know about our own hot button issues that press on the nerves in our brain, resulting in great pain and agony which in …

SVI Autostate

Switch Virtual Interfaces, or SVIs on Cisco IOS use a feature called autostate to determine the interface availability. By default an SVI will show an up/down (Status / Protocol) …

Nexus 1000v – Out of Ports on a Virtual Switch?

Yesterday, work presented an interesting issue I wanted to share with everyone. While configuring a new virtual machine one of our systems engineers was presented with an issue he …

BGP Essentials – The Art of Path Manipulation

Tony Mattke
Routing
4 min read

Most enterprise networks use BGP to peer with their Internet Service Providers if they want to be multi-homed. Many factors come into play when determining how traffic should flow, …

Introduction to the Nexus 1000V

The Nexus 1000V is a software-based Cisco NX-OS switch that integrates into VMware vSphere 4 and operates inside the VMware ESX hypervisor. With the 1000V your virtual servers have …

OSPF Graceful Shutdown

Tony Mattke
Routing
5 min read

Striving to reach that last 9? Looking for a way to increase your uptime while still being able to do maintenance on your network? Wish you could shutdown your OSPF neighbors like …

ASA v8.4

Less than a year after changing the rules with ASA version 8.3, Cisco has released a new OS version 8.4. Since I won’t be covering the release notes word for word, you can find …

IOS Embedded Packet Capture

Tired of setting up SPAN sessions? Need to do some packet analysis? Since IOS 12.4(20)T Cisco has made Embedded Packet Capture (EPC) available. EPC is a powerful troubleshooting …

Nexus Virtual Port Channel (vPC)

The Nexus 7000 and 5000 series have taken port-channel functionality to the next level by enabling port-channels to exist between links that are connected to different devices. …

Setting up a Cisco Access Server

Whether your networking lab has 3 devices or 30 an access server, also commonly called a terminal server, is the vital connection between you and those devices. For this purpose …

HSRP, VRRPd, and GLBP Compared

Tony Mattke
Routing
5 min read

In the world of first hop redundancy, we have plenty of choices. In order to make the right decision for your network you should know the basics regarding all three. The following …

BGP Tips! multipath load balancing

Tony Mattke
Routing
3 min read

Previous thoughts on load balancing BGP were that it is not a load balancing protocol and in order to achieve any sort of balanced traffic you would have to perform some sort of …

Petition Cisco for Educational IOS Licensing

Greg Ferro of Etheralmind.com has started a petition asking Cisco to embrace those who pursue Cisco’s certifications a legal course of licensing without the cost of building a home …

Working with the Embedded Event Manager (EEM)

Cisco IOS has plenty of gems contained within, but few are as fun, and as endlessly useful as the Embedded Event Manager, or EEM. To define it simply, EEM is a technology that …

More IOS Tips

Learning the particulars of Cisco IOS is one of the most valuable things a network engineer can do. These skills will be the basis of everything you do on the lab and on your …

Using the Cisco IOS Archive Command

The Cisco IOS archive command is not only very useful in keeping configuration archives, but it can also be used to log commands entered into the router, along with their user …

Introduction to Private VLANs

The concepts behind Private VLANs are in fact rather simple, but it is quite easy to get discombobulated in the details. In their simplest form, PVLANs can dissociate ports within …

Bidirectional Forwarding Detection

Tony Mattke
Routing
6 min read

Bidirectional Forwarding Detection (BFD) is a UDP-based protocol that provides fast (very fast!) routing protocol independent detection of layer-3 next hop failures. BFD can be …

Measuring Cable Lengths on a Catalyst Switch

A while back, I was playing on a 3750 switch in a customers lab and came across something I’ve never seen before. It seems that some Cisco switches have a built in …

Using Discontiguous Wildcard Masks in ACLs

Unlike subnet masks, wildcard masks allow you to use discontiguous bits which enable you to match on a range of values. Using these within routing protocols is typically frowned …

Using Regular Expressions on Cisco IOS

As a followup to my previous post on Regular Expression Basics, I wanted to give a few examples on using them on Cisco IOS. Obviously, with a topic as large as regular expressions, …

More BGP tricks

Tony Mattke
Routing
2 min read

At times, the ‘rules of BGP’ don’t fit the needs of our productions networks. When we get into today’s production networks how often do book configurations apply? I’ll tell you one …

iPhone – Rock App Causing Devistation

Recently, an update to all jailbroken phones could of caused major damage to anyone who uses Rock… There were several community updates in the last few days due to the iPad and new …

Cisco VOIP Basics – Call Broadcast for Cisco CME

This is the fourth and final part of my Cisco voip basics series. ( Parts 1, 2 & 3 ) Our goal in this series has been setting up a working voice gateway that you could use in …

Poor man's VPN connection

Have you ever needed to access a site that had an IP restriction, or one inside your remote network? Recently I need to access a customers remote monitoring site, but its …

Netcat – secret weapon

Netcat or nc, is a forgotten tool in too many arsenals these days. It lays dormant waiting at the command line to make connections across the globe for you. Knowing how to use it, …

Connecting Dynamips to your local network (OSX)

Ever wanted direct network access to your Dynamips lab? Have you ever needed to lab something that used the SDM, but you run Dynamips under OSX? You may have noticed using …

Policy Based Routing

Tony Mattke
Routing
3 min read

Policy based routing is the process of altering a packets path based on criteria other than the destination address, commonly referred to as ‘policy routing’. PBR (Policy …

The History of PING

Anyone that has touched a computer these days has probably heard of ping. But very few know of its true origins these days. The following is based off the original developer, Mike …

Using /31 subnets for point-to-point interfaces

Tony Mattke
Routing
2 min read

Recently a “colleague”, I use that term very loosely here, was reviewing my recommendations for changes on his network. Since they’re rather tight on public IP space, and require …

The Holy Hackintosh Build

This is a follow up to my previous Hackintosh post chronicling the build and setup of my ‘Hack Pro’. My original goal was to build a Mac Pro clone using off the shelf parts, with …

The Road to Hack…intosh

Over the past couple months, the lack of desktop here at home has driven me up the wall. Turning to my laptop time and time again, hooking it up to an external monitor while …

IOS ACL Resequencing

This is one of those tricks you wish you learned about 10 years ago, but never did. You know how easy it is to mess up a nice looking access list. You get one setup on the router, …

Cisco MPLS VRF Configuration and Demo

Tony Mattke
Routing
11 min read

A while back I asked everyone to vote on what topic they wanted to see next, and by no surprise almost every voted for MPLS VRFs. When I started working on this, I decided to take …

JunOS Olive Demonstration

As a follow up to my JunOS Olive tutorial, I made a demonstration video that shows Multicast functioning via OSPF to another Olive and an ImageStream VM.

Running JunOS under VMWare (updated – again!)

Interested in trying out JunOS? Can’t afford to build a real Juniper lab? Sounds like you need some Olives. No, we’re not talking about the green fruit commonly seen in a martini …

Mail Server Relay Testing

As you may know, I am not big in the server world, even less into mail servers. They make me sick. But, today I found a nifty little tool you can use to test your mail server …

Route Selection

Tony Mattke
Routing
7 min read

One of the most common questions I get concerns path selection within the router. Everyone knows (or at least they should know) that a more specific prefix will be preferred, but …

Cisco VOIP Basics – Cisco Dial Plans

This is the third part of my Cisco voip basics series. ( Parts 1, 2 & 4 ) Our goal is to help you configure a Cisco voice gateway that you could use in your home office. This …

Snow Leopard – The What It Broke Edition (updated)

Snow Leopard was released on August 28th, and at 1:37pm I received my copy and proceeded to install it like a well trained puppy. After installing, I think I was more obsessed with …

Setting up Apple Filing Protocol and Bonjour under Debian

Got a Mac ? Got a Linux box that you use as a file server on your home network? Sick of problems with samba? So was I, until today when I decided to figure out how to setup Apple …

Cisco VOIP Basics – Installing Cisco Call Manager Express

This is the second part of my Cisco voip basics series. ( Parts 1, 3 & 4 ) Our goal in this series is to setup a working voice gateway that you could use in your home office. …

Testing TCP Connectivity on Cisco Devices

Ever thought you might be having some Layer 4 connectivity issues? Pings as you should know are ICMP transmissions and ICMP is a Layer 3 protocol (commonly used to send error …

Cisco VOIP Basics

This is the first part of my Cisco voip basics series. ( Parts 2, 3 & 4 ) VOIP is obviously becoming a large part of networks, even now part of your CCNP requirements are basic …

Usefull OS X Eject Key Shortcuts

Recently, I was using one of my custom short cuts and fat fingered the F12 key on my laptop… What resulted was my screen shutting off. Mystified, I began searching for standard OS …

Juniper Fast Track Program

This summer I learned about a fantastic offer from Juniper to ‘fast track’ you into a certification. They’re offering training material, and if you can pass their pre-assessment …

BGP Security Tips (updated)

Tony Mattke
Routing
2 min read

For some, BGP is a rather large obtrusive beast of a protocol that scares them half to death. This is not without good reason as BGP is not only the most important protocol running …

Configuring a Cisco Router as a Frame Relay Switch

One of the most effective lab setups uses frame relay as its primary transport method. This is a configuration that many people use and praise for its ease of setup and …

Google Voice Widget for OS X ‘s dashboard

Seriously… Why haven’t we seen this yet? This is the perfect application for the dashboard. Send text messages to your friends / family from the comfort of your computer without …

An Essential Alias for Forgetful Engineers Like Myself (updated)

How many times a day do you issue a show command from configuration mode ? If you’re anything like me, its enough to get annoying. Luckily Cisco has given us the ability to user …

Setting up VOIP lab

This week I’ve started setting up a VOIP lab to explore the technology and when I’m done, I plan to integrate it into my home network. So far I’ve purchased the following for my …

OS X Leopard Hacks

Here are a few settings you can change using the OS X defaults command to access some system parameters. As always, proceed with caution, and don’t mess with things of which …

Demystifying Cisco Config Register Bits

Ever accidentally set your config register to a random value that isn’t in the Cisco documentation? No? Neither have I, but one day I encountered someone on #cisco that had. So I …

Securing SSH against bruteforce attacks

This is one of the methods I’ve used in the past to secure a Linux host against brute force ssh attacks. While its not a perfect method, it does a good job of preventing 100s of …

Regular Expression Basics

Before I even get started, I want to mention that not all regular expression metacharacters are supported in every application. Keep this in mind when building your matches. …

Cisco IOS Tips and Tricks

So, I’m sure these have been posted almost on every networking blog under the sun, but who knows, right? Here are a few tips and tricks to help you move around the IOS a bit …

Working on my new lab setup

So, I purchased a couple extra routers, and a second layer3 switch from @usedciscoguy. He gave me a really good deal and I plan on purchasing a 6500 series switch from him as soon …

Layer 2 Ethernet transport over OpenVPN

Tony Mattke
Routing
1 min read

One of the things I used to deploy frequently at my previous position was transport for other ISPs and businesses. Since MPLS support is in its infancy on the Imagestream platform, …

Using OSPF to create unlicensed full duplex connections.

Tony Mattke
Routing
4 min read

Recently one of my clients asked me to help resolve an issue at an aggregation point on their network. They had several connections that converged onto a single unlicensed link on …

How does latency effect throughput?

Tony Mattke
Routing
2 min read

One of the questions I get asked several times a week by my clients is as such. While most people never associate latency with the amount of data they can send across a single TCP …

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