Category Archives: Uncategorized

Support for Allied Telesyn switches is not included out of the box with rancid. We’ve got to add 2 files and then enable the “at” type.

I’ve found a few examples around for atlogin and atrancid but of the two I tested neither worked without tweaking.

I’m currently using these.

Add these two files (ATlogin & ATrancid) to /var/lib/rancid/bin/. Then change their permissions to 755.

Next edit /var/lib/rancid/bin/rancid-fe and add  ‘at’ => ‘ATrancid’ to the vendor table.

%vendortable = (

'at' => 'ATrancid',

)

Make sure the syntax is correct with comma, etc.

It should work the same way as the rest of rancid now.

I was getting an error when running ATrancid that ATlogin couldnt be found. I updated the path to include /usr/lib/rancid/bin and it then worked.

I finally moved the blog off EC2 and RDS. It was crashing, usually with the CPU at 100%. I couldn’t get into it to see what was going on when it would happen. Oh well. New home.

Some of the graphics uploaded are broken. I’ll look at fixing that at some point.

The wp-content/uploads folder didn’t fully copy over. It’s copied now so images are back.

Netflix has an ISP Speed index out now.

The FCC is looking at adding an extra 195 Mhz to the 5 GHz range. Currently, the 22 channels (13 usable without all that DFS mumbojumbo) will increase to a whopping 35 channels.

Here is a good article about it all.

Renesys has spent some time analyzing Sandy’s impact on the routing table Monday night. They made an animation which shows routes being removed during the storm.

From the article:

Here’s another quick view of the impact on the routing table as Sandy came ashore Monday night. Each square represents the fate of a set of networks geolocated within a common tenth-degree square of the Earth’s surface — at these latitudes, that’s about 90 square kilometers.

At one end of the scale, the darkest green indicates better than 99.95% of the networks are available. At the other end, solid red indicates that more than 5% of the networks at that location have been removed from the global routing table, meaning that they can’t be reached by anyone.

Five percent doesn’t sound like much, but consider the Internet density in the affected areas! In fact, Manhattan’s outage rates were much higher — on the order of 10%, which is impressively low given the fact that ConEd cut power to much of the island. Silencing ten percent of the networks in the New York area is like taking out an entire country the size of Austria, in terms of impact on the global routing table. The 90% that survive are in data centers, running on generator power supplied by engineers who do not sleep much.

It’s striking to observe not only the impacts in NYC, Long Island, and New Jersey, but also peripheral weather-related outages in the Washington DC area, and up the I-93 corridor from Boston into New Hampshire. The Internet has become a sensor network in its own right for determining where storm damage is occurring — and since BGP routing converges in realtime, that information literally becomes available within a few seconds.

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