2702.dk

Jan 13th 2010

The default ssh settings in many Linux and BSD distributions have been changed, so that the known_hosts file no longer contains IP addresses (or hostnames), but a hashed value of this. This is for security, as not to give an attacker that has compromised a given machine a very good starting point in which to look at other machines where there may be shared credentials, or passphrase-less public-private keypairs. This is all good and well, but in the situation where a host has been reinstalled, for instance, and its keys/fingerprints have been re-generated, one might want to delete the offending line in the known_hosts file. Problem is, which line is it? We could delete the entire file, but that's a bit hamfisted. The solution lies in the ssh-keygen command. A few options have been added, namely -R, which deletes the specified entry in the known_hosts file. For instance, to delete the entry for 2702.dk, issue a 'ssh-keygen -R 2702.dk' command. If you've ever logged in with just the IP address, that has a line as well. Other interesting options are -H and -F; see the man page for details.

Sep 22nd 2009

I recently purchased a new cellular phone - a Nokia E52. Over all it's a great phone, but I've had some issues with it, that I'd like to share here, to maybe save others a bit of time.

• The first phone I received would turn off spontaneously, sometimes being very hard to turn on again. This was especially true while trying to make a call. It got progressively worse, so I sent it back, and received a new one. I found someone from Malaysia, I think, on a blog somewhere that had experienced the same problem.
• The GPS receiver needs something called an almanac to function the very first time the GPS is used. This is a piece of information that tells something about the position and general trustworthiness of the different GPS satellites. If you don't have a data plan set up, like I didn't, the GPS seems not to work. This is not the case; the very first time just takes forever, as the phone receives the almanac from the GPS satellite, which can take up to twelve minutes, according to Wikipedia.
• The WLAN interface draws a lot of power, so remember to turn it off when you're not using it. I forgot, and it drained a freshly charged battery in eight hours.

20. Maj 2009

Tilbage efter myyystiske hardware problemer...

13. Maj 2009

Tilbage efter en lille pause, på ny hosting (en Soekris 4801 på mit stuegulv.)

23. Marts 2008

Nu med indhold under Optimer din SU.

27. Februar 2008

OK, NU er vi i luften, og endda med noget indhold under Academia... (og datoen var ikke engang med vilje ;) .)

5. November 2007

Så er vi i luften!