Tag: network

Docker and Linux Networking: Custom Interfaces!

Hi All. Today my goal was to build on a previous post I wrote on Default Routing, RIP v2, and VMware Workstation NICs. The problem? I am running on AWS EC2 so nested virtualization options are lacking (Ravello Systems has

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CentOS Wireless: Fix when it breaks!

Hi All – if you have ditched NetworkManager (as I have) and you are still running into wireless LAN access problems…check out this script!

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Debugging Neutron DHCP Failures on OpenStack

Hi All. Today’s adventure touches on a common OpenStack Neutron theme: “I just created a VM. It’s running. It says it has an IP address. And I can’t ping it!!” Read on for tips on debugging Neutron DHCP Failures on

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OpenStack: Adding External Networks to Neutron with GRE

Hello All – today’s post is on Neutron using GRE Networking. The all-in-one OpenStack gives you GRE by default but only a single external subnet. Read on to learn how to add more external networks!

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CentOS Wireless Problems and Dumping NetworkManager

Hello All, it’s been a while since I’ve posted. This post will discuss how you can dump NetworkManager and still get your wireless to work on Linux (CentOS 6.5, specifically). Read on for more!

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CCNA – Don’t forget “ip routing”

Just a quick note here – if you are reading the Lammle book Chapter 7 on IP Routing, you have no doubt run into his lab with the Corp, R1, R2, and R3 routers. We did and diligently followed the

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What Makes Up Networked Storage Throughput?

While researching distributed cloud storage we came up with these interesting points on storage throughput along with some great links for additional reading. Input/Output Per Second (IOPs). This is the most-commonly quoted measurement. For Amazon’s Relation Database Service (RDS) public

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CentOS/RHEL and wrong Network Interface

This is a quick entry on a particularly irritating CentOS peculiarity – after you clone a virtual machine, your /etc/sysconfig/network-scripts/ifcfg-eth0 no longer gets invoked. This is because CentOS can arbitrarily assign the physical network card to a different logic interface

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NFS via Server 2008 R2 to ESXi: The Book

This article details exactly how to take an arbitrary server, install a *hardened* Windows Server 2008 R2 (W2K8R2) image on it, and then use that W2K8R2 server to deliver NFS to ESXi hosts. We had to do this recently to

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Solve “Unidentified Network Error” for Windows Server 2008

Anytime a non-routable network connection (any IPv4 network adapter that does *not* have a default gateway specified) is configured for a Windows Server 2008 server, the operating system will mark that network connection as an “Unidentified Network”. The downside? Windows

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