If you ever needed to hide multiple systems behind a single IP address you would use PAT. (Port Address Translation) besides using this to connect to the internet when using an RFC 1918 address, you can configure PAT for VPN connections. The benefit is the same, hide multiple systems behind a single IP address with the advantage being you can have many systems on one side of the VPN tunnel all using that single IP.
One of the neat features of Cisco VIRL is it runs on an open platform, with OpenStack as the orchestration program running on top of an Ubuntu operating system. This gives VIRL additional flexibly by being able to run third-party VMs with KVM begin the hypervisor. In this guide I’ll walk through some of the steps I took to get Windows XP up and running in VIRL. 🙂 Continue reading
I was working with a Cisco 9372TX switch, and on it I had two 40Gbps uplinks that we where using out of the available four. Talking with our VAR because we where planning on connecting in additional equipment that only supported SFP+ interfaces. So the solution was to connect to this switch with QSFP to SFP+ adapters. Thinking this would be a simple change because we are just plugging in additional adapters on the QSFP ports we planned our maintenance window and rollback plans but I wasn’t expecting a rollback for this one 🙂 Continue reading
If you ever needed a TFTP or an anonymous FTP server to transfer files, logs, or crash debugs to and from your network devices it can be a little tricky if you don’t have anything setup. There are some free quick programs out there if you are in a pinch for one-time transfers but if you ever wanted to have something in infrastructure that is ready to go for this kind of stuff just follow this tutorial below. I’m using the latest version of Centos 7 minimal, we need to add some house keeping items first so let’s get started! Continue reading
Testing a network’s throughput is a good move, if you are testing a new service you stood up or making sure you getting what you paid for. iPerf is good free open source tool when there isn’t really a need to use commercial more expensive tools. In this short tutorial I’ll go over how to configure iPerf which is a CLI tool so let’s get started. Continue reading