certification

Preparing for my F5 Bip-IP certification

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We are implementing a setup of F5 Big-IPs, and I decided its time to get back on the certification tracks. As such, I am going to start with the F5 Certified Bip-IP Administrator certification. This certification requires 2 exams: Application Delivery Fundamentals, and TMOS Administration. I have been told that the first exam is little […]

Networking

Site-to-Site VPN using Vyatta

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I was testing a new backup solution that does replication across the wire to a secondary site. I didnt want to impact production, so I used VMware to clone the system I was backing up, and used an isolated network for my backup testing.All was fine until I needed to setup a target at my […]

Networking

Monitoring wireless networks

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I just rebuilt my laptop and was in the process of reinstalling all my normal tools (7zip, Chrome, wireshark, etc…) I suddenly remembered that I had a great wireless monitoring tool that allowed me to see what networks were nearby, what channel they were on, and how strong their signals were over time, but I […]

Networking

Vyatta virtual router

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Often times when setting up a test lab, I will use a Linux system as a router/firewall. While this works, it requires somewhat intimate knowledge of Linux setup and networking – something not everyone is going to have. I found the Vyatta platform is a nice hybrid between a Linux server and a network appliance. […]

Networking

Use SNMP to find a device on Cisco

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In my recent search for a rouge MAC address, I had dozens of Cisco switches to look through in order to find the port the address came from. I vaguely remembered hearing about someone using SNMP to track a MAC down to a specific port on a switch, and decided to take a look. I […]

Networking

Bonding interfaces in Linux

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I recently setup a Linux box to act as an NFS gateway and wanted to bond multiple 1GB interfaces together. The bonding would allow for more throughput, as well as redundancy in case a link failed. I asked my network guy to create an LACP group on the Cisco switch, and then followed the bonding […]

Networking

Networking Functions and Devices

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Now that we have the basics of networking theory, what does this mean to network functions and devices? Lets start at the bottom of the OSI layer and work up.PhysicalThe physical layer is exactly that – the physical (or wireless) connectivity between devices. The physical layer includes the network interface cards (NIC) and cabling between […]

Networking

Networking 101

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I recently was involved in several technical interviews for some technician and administrative positions, and was surprised by how little most of the prople understood networking basics. Most of the answers I got in the interviews focused on: Hubs are for home offices Switches are smart hubs, and used in businesses Routers are used to […]