Free Webinar – DMZ Anywhere.Let’s talk about DMZ security design options
This is a free webinar but requires registration and seats are limited thus please register immediately. Webinar on Tuesday, February 28, 2017 7:00 PM – 8:30 PM AST. REGISTER Agenda Introduction to Security Zones What’s DMZ? Why do we need DMZ? Physical vs Logical Network Segmentation Emerging Technologies (Virtualization, Micro Segmentation) Benefits of DMZ Anywhere […]
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Python – Kirk Byers Course Week 3 Part 3
This post will describe the exercises and solutions for week three of Kirk Byers Python for Network Engineers.
The last exercise of the week is to create an IP address checker that checks the validity of an IP address. Here are the instructions:
IV. Create a script that checks the validity of an IP address. The IP address should be supplied on the command line.
A. Check that the IP address contains 4 octets.
B. The first octet must be between 1 - 223.
C. The first octet cannot be 127.
D. The IP address cannot be in the 169.254.X.X address space.
E. The last three octets must range between 0 - 255.
For output, print the IP and whether it is valid or not.
The IP address will be supplied through the command line. Like we’ve done before we are going to check the number of arguments supplied and exit the script if the number of arguments is not two. We need to import sys so that we can use sys.argv.
import sys
if len(sys.argv) != 2:
sys.exit("Usage: ./ip_checker.py <IP-ADDRESS>")
We’ll store the IP address as input as dotted decimal into the Continue reading
Using DCNM to Automate Cisco FabricPath Operations
In my final post on Cisco’s Data Center Network Manager (DCNM), I’m taking a look at the deployment capabilities and templating features which allow configuration to be deployed automatically to multiple devices. In its simplest case, this might be used to set a new local username / password on all devices in the fabric, but in theory it can be used for much more.
DCNM Scripting
Let’s get one thing straight right out of the gate: this ain’t no Jinja2 templating system. While DCNM’s templates support the use of variables and some basic loop and conditional structures, the syntax is fairly limited and the only real-time interaction with the device during the execution of the template amounts to a variable containing the output of the last command issued. There are also very few system variables provided to tell you what’s going on. For example I couldn’t find a variable containing the name of the current device; I had to issue a hostname command and evaluate the response in order to confirm which device I was connecting to. That said, with a little creativity and a lot of patience, it’s possible to develop scripts which do useful things to the fabric.
Continue reading
Q&A: Migrating to Modern Data Center Infrastructure
One of my readers sent me a list of questions after watching some of my videos, starting with a generic one:
While working self within large corporations for a long time, I am asking myself how it will be possible to move from messy infrastructure we grew over the years to a modern architecture.
Usually by building a parallel infrastructure and eventually retiring the old one, otherwise you’ll end up with layers of kludges. Obviously, the old infrastructure will lurk around for years (I know people who use this approach and currently run three generations of infrastructure).
Read more ...February 2017 CCDE Training is over ! Waiting the attendees success now !
My February 2017 CCDE class is now over. The duration of the course was for 11 days and as usual it started with lots of advanced technology lessons. All the critical CCDE exam topics (IGP, BGP , MPLS and the other technologies) were covered in detail from the design point of view. A minimum of […]
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