An update on things

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Things have kept me very busy with Simon gone, so I apologize for the lack of updates.

The interns started on replacing the network jacks in the residence halls this summer… so far Alumni is done, Lankenau 3rd, 4th and 5th floor are done, and Scheele 4th and 5th are done with 2nd and 3rd presently being worked on. They’re making good time and I hope to finish Lankenau and Scheele for certain, and hopefully Brandt as well if time allows before students move back to campus.

The new Union construction is coming along well, so as a result I’ve been keeping busy getting networking equipment quotes for that. I’ve also worked on quotes for the new VUPD extension, adding wireless to the Deaconess center, and the Gellerson project to name a few.

As part of preparations for the new Union, I have gotten to create new subnets for their network traffic as well as new VLANs too.

I did my first Clean Access Server / Manager upgrade on my own recently… I’ve also finally gotten Cisco to locate and fix the problem we were having with some of the wired ports giving OOB errors, so that is finally behind us.

Planning for move in weekend has also been on my list of things I’ve been working on, as has new plans for the network fellows training for the upcoming year.

And unrelated to networking, I graduate with my MALS in 2 more weeks. It has been a super busy summer over here!

Simon leaves for IHETS

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My boss, now former boss, Simon has left VU and moved on to a new job at IHETS. Congrats Simon! That now leaves me as the sole staff member in charge of the network at VU for now. With all our projects and everything to do this summer, that will keep me plenty busy!

Network Intrusion

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Last Friday our Network Intrusion Detection server arrived from Dell. So we have been very busy installing FreeBSD as well as mysql, php, and other such fun in preparations to get the detection software installed. It’s a pretty beefy machine, so should be able to spot things a mile away once it’s configured properly. I have much to learn with FreeBSD in the meanwhile though, but I’m excited!

Internet

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Today our ISP has gone down… evidently AT&T cut a fiber somewhere off site and took down several circuits. We are not the only ones affected either. So yeah… at work, and all I can access are things we host (valpo.edu websites such as this, groupwise messenger, email, and the like). Also they said it would likely be several hours before the problem is resolved… so who knows how long this will be down for :(

So now all I can do is work and wait.  At least it’s nothing we did on our end to the network.

Networking Intern Interviews

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This week and last week have been very busy with networking intern interviews. I am very excited as we draw near an end as they have all been a very exciting group to interview and we should have a fantastic team working for us next year.

Switch Crash

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So while upgrading a bunch off switches this morning all went fine… except MEM02-S02… it decided it hated me and wouldn’t load back up after the upgrade was complete… after spending all morning troubleshooting it… we ended up having to grab the spare switch, swapped it out, and emailed Cisco for a replacement under the warranty…

All the rest behaved just fine, guess it’s just luck that I can’t have the procedure go painlessly. It’s still a puzzlement why that one failed anyway.

Ah well, tomorrow is a new day and we shall configure ports in the ARC for the upcoming LBAA tournament.

Inventory

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I am proud to say that port, switch, closet, and ups inventory is now done! All buildings have been inventoried. Next up may be fiber inventory, but otherwise inventory is complete. It’s an amazing feeling.

I also made an inventory sheet for the cisco switches which lists tag #, model, serial number, ip address, firmware version and date of last reboot for the switches. It has been very useful in allowing better planning for maintenance windows so that we can figure out which switches have the oldest firmware and do those first.

Posty!

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Hello, interblag!

I believe it’s week four or five of my seven-week rotation. The dates don’t really matter; working with networking is a steady gig rather than a project, so you do the same kinds of things every week. I’ve had both types before, and they both have their charm–with a steady gig, you can figure out when you’ll have to work and you get lots of practical work experience, whereas with a project, you can choose to do something you really enjoy, and it’s possible to get massive amounts of hours clocked. During my stint with the wonderful Web Rotation (hello, folks!), I spent the last three days before our presentation was due in the Advanced Media Lab, from six p.m. ’til midnight, just slamming down the animation goodness.

Has that happened here? Not at all. I’m sure my body is thankful for it.

Mostly what has happened with networking is, for you webernetters who are unfamiliar with the job, something called Inventory. All the wires which connect the campus’s stupendous amount of desktops are hooked up the right way, connected to patch panels and switches and routers so that everybody (theoretically) can do internet-type thins, like write blogs. However, sometimes a piece of it all will go wrong, and a friend of mine in Brandt Hall will say, “The internet is not working!” Indeed it is not, anonymous friend. Probably the issue lies in a misplaced cable, or perhaps a bit of hardware that has just worn out, but in order to figure out just which piece of the network is bad, we need to know how every bit relates. Right now we do not.

The server closet in the ARC looks like a jungle. No kidding. The red and blue ethernet cables are like vines that want to strangle you.

To figure out how all the wires and panels and Power Injectors (which ought to be something in a video game) specifically relate to each other, myself and the rest of our rotation must accompany one of our bosses–and perhaps an intern as well–over to all the campus’s server closets and record a lot of numbers from labels, and then trace each ethernet cable from the end connected to the Patch Panel to the end connected to the Switch, and match up the labels we find.

It is a job full of mendacity, if I use that word right, but oddly enough it has a therapeutic calming effect on me. You just get lost in the very slightly challenging task of following one wire among so many (though most closets are six thousand times better than the ARC’s) , and your mind goes numb. One might even call it Zen. Your neck muscles may start aching, however, in which case you should probably switch out with your partner.

That’s a tip, kiddies! Never go taking Inventory without a partner! I did it once, and it very nearly trapped me in a parallel universe of aching necks!

Other than that, we pull cables through tubes, chop apart old cables and pull them out of tubes, and use a wheely-thing to measure how much cable we will need for this new tube we’re thinking about installing. The internet, man! It’s a series of <cut>! We check the “HEAT” service request system every day, but on my shifts we never find anything. The very first day we thought that there was a problem which we could fix, but it turned out that the computer acted fine once we got there, and apparently hasn’t acted up ever since. Go figure.

Incidentally, Simon Kissler, one of my bosses, has a sneaky sense of humor. You’ll think he’s just this strange man walking around knowing things, and then he’ll say something that makes you chuckle. But if you start treating him as a man walking around making people chuckle sometimes, he’ll just start knowing at you, talking about Gigabit ethernet ports, and DARPANET, and how long an unassisted fiber optic cable can maintain a signal, until you have to forget about the laughter to make room for all the knowledge. Then he’ll make you chuckle again. Confusing!…and delightful? Maybe!!

Currently I am blogging in the middle of learning things on ElementK, because my boss is sick, and doing ElementK is about as necessary as and far warmer than everything else I could do.

In closing, during the writing of that last sentence I very nearly lost the entirety of this post. You see, Firefox and ElementK conspired to shut down Firefox.exe. They succeeded. However, Firefox had forgotten that it had, a while ago, hired a device that saved it’s status during a crash, and to Firefox’s frustration the device–I believe it is a relation of Browser Cache, that packrat–reloaded everything, including my blog. Thank that device if you enjoyed this, Dear Reader, for it is the reason I did not just write something like “Firefox deleted my post, and I shan’t write another. Good day.”

Good day!

- Will

Various Failures and Their Causes

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Yesterday and today have seen ports fail for a variety of reasons. Yesterday, we came across one port which had the pin broken off where you put your ethernet cable inside the wall, normal insertion would not do this, so how it happened is a mystery, but alas was the cause. Another port in the same building, was not punched down very securely, and immediately upon pulling the port off the wall and lifting up the cover where it is punched down, one of the copper cables flew out of where it should have been securely stuck. So for the first bad port, the entire port was replaced. For the second, just the loose cable was punched down and voila it was working again and passing cable tests.

Today saw different failures. First we went to a port that gave no connectivity… and shortly thereafter (once locating it on the switch) discovered the the brand new patch cable going from the patch panel to the switch ended up being a dud. So that was replaced and all was good.

The last port issue of today so far was a misconfigured switch port. The room was getting limited or no connectivity and investigating in Clean Access Manager ended up showing us that it was misconfigured for a completely different buildings VLAN! Once the VLAN was corrected, the port correctly was able to get connectivity again and all was well.

And there is a summary of a wide variety of port failures all seen yesterday and today.

Active and Passive FTP

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In reading further into my network intrusion detection book today I come across a section which talks about Active and Passive FTP. In Active FTP the server makes connections with the client. In Passive FTP the client makes the connections with the server. Evidently for packet filtering devices we like passive better because in active ftp we have to allow it to talk outside the realm of packet filtering comfort zones, leaving holes open for hackers to exploit. In active FTP you would have to allow all inbound traffic to port 20, not knowing if it’s valid or not, with passive FTP the server lets the client know where it will be listening, and then the client sends in bound traffic there making it a much safer to assume that this port is trusted. Interesting stuff as always!


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