Entries Categorized as 'Networking'

Accidental DoS during an intentional DoS

Date October 24, 2014

Funny, I remember always liking DOS as a kid... Anyway, on Tuesday, I took a day off, but ended up getting a call at home from my boss at 4:30pm or so. We were apparently causing a DoS attack, he said, and the upstream university had disabled our net connection. He was trying to conference […]

VM Creation Day - PowerShell and VMware Automation

Date October 17, 2014

I should have ordered balloons and streamers, because Monday was VM creation day on my VMware cluster. In addition to a 3-node production-licensed vSphere cluster, I run a 10-node cluster specifically for academic purposes. One of those purposes is building and maintaining classroom environments. A lot of professors maintain a server or two for their courses, […]

Ubuntu and SNMP

Date August 21, 2014

After running Ubuntu for about two years now, I have a laundry list of complaints. Whether Ubuntu is automagically starting daemons that I install, or the relative difficulty of running an internal repo, or (and I'm heartily agreeing with my coworker Nick here) that it doesn't actually include a firewall out of the box....there are […]

Fun lesson on VRRP on Nexus

Date April 8, 2014

I'm in the middle of migrating our upstream links from the old 6500 core to the new Nexus switches, and I discovered something fun today that I thought I'd share. Before, since I only had a single switch, each of my subnets had a VLAN interface which had the IP address of the gateway applied, […]

Cisco Switch-Profile Issues

Date December 27, 2013

So, whenever you've got a Fabric Extender attached to more than one switch, you need to configure the shared ports in both places. To make life "easier", Cisco has the concept of "switch profiles", where the two switches will have what amounts to a template, that gets applied. That way you don't have to worry […]

Cisco Icons for the Bored

Date December 12, 2013

I wanted to make a network diagram this morning, so I was scrolling through all 40 pages or so of Cisco icons, I found myself picking out ones that I wish I could use, even though all I wanted was a damned switch icon, and I found everything except a switch icon, but whatever. I […]