Category: Network

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!

Posted in Network, SysAdmin, Teknocratica Tagged with: , , , ,

proxytunnel 1.9.0 Compile Fix for Mac OS-X

Need to run proxytunnel 1.9.0 on your OS-X Mavericks Mac? Well, just try it with the latest Brew installed and it breaks. Read on to see how to fix it!

Posted in Mac, Network, Teknocratica Tagged with: , ,

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

Posted in Cloud, Network, OpenStack, Teknocratica Tagged with: , , ,

OpenStack: Fix “Missing” External IPs in Neutron

Have you ever assigned a “floating” IP on your external network to an OpenStack VM…but not been able to ping it? Read our article for info on how we workaround the problem!

Posted in Network, OpenStack, Teknocratica Tagged with: , , , ,

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!

Posted in Network, OpenStack, Teknocratica Tagged with: , , ,

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!

Posted in Network, Teknocratica Tagged with: , ,

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

Posted in Network, Storage, Teknocratica Tagged with: , ,

VMware dvSwitches and Port Mirroring

When debugging a network problem, the first one wants to do is to…get the packets! In the past watching network traffic in real-time required either “promiscuous” mode network cards (NICs) or using hardware-based “port mirroring” on physical switches. Read below

Posted in Network, Teknocratica, VMware Tagged with:

CCNA – Migrate Software Routers to Hardware Routers

Click here to download the whitepaper “Cisco – Software Router Migration” now! In this paper, the reader follows along as a set of software routers are migrated to Cisco hardware routers. Software routers, while easy to setup and maintain, suffer

Posted in ccna, Network, Teknocratica, VMware Tagged with: ,

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

Posted in Network, Storage, Teknocratica, VMware Tagged with: , , ,