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Kenneth Finnegan Profile picture
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27 Nov, 4 tweets, 1 min read
I can't remember the last time I played a video game, but I bought shapez io for this weekend.

It's definitely enjoyable. All the puzzle solving of Factorio without the combat or resource management
Who doesn't love shapes?
And colors!
All this work just to make the white circle on top of the blue droplet shape for the next level.

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More from @KWF

Kenneth Finnegan Profile picture
27 Nov
Me: "Huh... I wonder why this Ubuntu 20.04 image is still using the SysV networking service..."

Me, two hours later: *The internal screaming intensifies*
In case you can't figure it out, this is a really stupid trick I've seen on IPv4 to save address space where you assign a /32 to the public interface, then point default via a static on-link route to the router on any other address you want.

I have never seen this trick on v6.
"If it's stupid and it works..." does NOT fucking apply here.

It's stupid, and it working doesn't excuse that.
Read 4 tweets
Kenneth Finnegan Profile picture
27 Nov
Through a long series of unfortunate events, for our smallest Thanksgiving ever, my dad has ended up cooking a 19lb turkey.
Granted, we also usually do two turkeys and a ham, so I guess just a single turkey of any size is more reasonable.
It's important to remember that a mind boggling number of people are food insecure today, and that's a truly terrifying sensation that's hard to imagine.
Read 5 tweets
Kenneth Finnegan Profile picture
19 Nov
Engineering: "Make sure to not put solder mask on top of the high speed 56Gbps differential traces to reduce dielectric losses"

Manufacturing: "lol, sticker" ImageImage
My favorite manufacturing problem I was personally involved with is still the time I was working on an RF assembly about the size of a small suitcase, and as soon as we transferred the design to volume manufacturing, the screws suddenly started seizing.
It was a welded aluminum box about 18" on the long end, with a removable lid held down by 43 stainless steel #6-32 screws threaded into helicoil inserts in the main enclosure body. Image
Read 9 tweets
Kenneth Finnegan Profile picture
5 Nov
Active Optics Cables, or AOCs, are essentially patch cables desired to plug directly into *SFP cages.

They're just like DACs, or Direct Attach Cables, but with more length options and the cable routing advantages of fiber.
The nice thing about AOCs over using SR4 optics is that it isn't connectorized, so you don't need to assemble three parts to make a link, and "cleaning fiber ferrules" is a ball game you don't need to get into.
This is a 400G OSFP AOC.

400Gbps
Octal Small Form factor Pluggable
Active Optical Cable

And let us all pause for a moment to admire how awesome OSFPs are and how they look space age af.
Read 15 tweets
Kenneth Finnegan Profile picture
5 Nov
Let's talk about Cisco 6500 line cards.

Because I'm currently sitting on a concrete floor dicking around with 6500 line cards.
The 6700 series line cards were actually modular, in that the forwarding engine on each line card was a daughter card that you could replace!
The CFC module is the chump change "punt everything to the supervisor" card that limits the whole box to the capabilities of the supervisor.

So like... 20 million packets per second?

Only.
Read 11 tweets
Kenneth Finnegan Profile picture
4 Nov
So let's say you have a nice server with a set of 8x3.5" disk bays in the front of it that you want to use for storage.

What you typically don't want to do is also install your OS on the same disk array. Image
You could burn one or two of the disk bays for the OS, but that sucks, and if you're doing something like ESXi or Green as, you don't need that much space.

But servers will have USB ports inside the case to boot off a flash drive! Literally just boot off USB forever! Image
But USB really sucks if your OS isn't mostly read-only, so your next option is to use one of the SATA ports inside the case.

Some server cases will sneak a 2.5" bay in the back by the IO panel. Image
Read 8 tweets

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