Archives For networking


I have a problem. The wifi in my office is weak. It usually works just fine, but my nightly backups are failing because the network connection drops very briefly on occasion. Usually this is imperceptible but if I’m doing a big download or backing up the task usually fails without completing. So I bought the Netgear Powerline 1200 adapter, the one without the passthrough port. It was cheaper and didn’t block the top power outlet so I don’t really care about the passthrough.

My goal was to see how it affected bandwidth with my MacBook Air (2011). To make matters complicated, my Air does not have an ethernet adapter, nor does it have USB 3.0. I only have one Thunderbolt port and it’s hooked up to a DisplayPort monitor. That means I’m stuck with USB 2.0 speeds. Turns out, the USB 2.0 speed is not a problem. Here are the performance results. Continue Reading…

IPv6 stump

I had a server recently start having serious problems with connections of all types, at least when IPv6 was involved. I use IPv6 at home and ssh access took a significant amount of time to make a connection. Then when I tried to do apt-get update from the server it would fail with a message like this:

$ sudo apt-get update
[sudo] password for matt:
0% [Connecting to (2001:67c:1360:8c01::1a)] [Connecting to (2001:67c:1360:8c01::1...

It would sit there and take forever without making any progress. Sadly, the Ubuntu docs aren’t much help unless you’re using Ubuntu 8.04 or older (I refuse to link to them which will only add to their credibility).

A workaround is to disable IPv6, but really you should take the time to fix the problem, since it is the way of the future. In my case I’m sure it’s routing related, and hopefully my server provider can resolve it. Until then, I do this: Continue Reading…