Linux

Beware of DNS

For some time the server running this site had been acting up. Page loads were slow, access through SSH seemed lagging and something was absolutely misbehaving. I’ve been trying to figure out what exactly was going on, but nothing really made sense. there were plenty of disk space, memory was reasonable utilized (no swapping) and the CPU load seemed to be less than 0.1 at any time - there were no good reason the server was “turtling” along at such a perceived slow pace.

Viewing EML files

As mails bounch around some email programs (I’m looking at you, Microsoft), seems to encrypt package forwarded mails in attachments with the extension .eml. On Linux… While Mozilla Thunderbird should be able to read them (as should Evolution), it requires you have the mail application available on your machine, but I haven’t - I’m doing just fine with GMail in the browser. So far the best solution I’ve find - assuming it’s trivial non-sensitive, personal files - that an Online viewer seems to work pretty well.

Salvaging a deleted message from Thunderbird

Suppose you got an important mail, but by accident deleted the message – and to make matters worse, you also decided that emptying the mailbox was a pretty neat idea. Is then time to Panic? Well it might, but there is a chance you might be able to undelete the message – and quite easily if you’re on a Mac or a Linux machine. Here are the few steps, which has helped recover a lost mail or two… First close Thunderbird.

Ubuntu: Changing your IP number

Sure it doesn’t happen that often, but sometimes you might need to change the IP number of your machine running Ubuntu. Either to configure it with a static IP number on your LAN or temporarily to configure a Wifi router - the latter being my case. The first shot at changing the ip number, was going to the “System” menu, choosing Administration and Network Tools. It sounded just about right - but it’s wrong.

Ubunutu Uncomplicated Firewall

I’m still enjoying the fresh new Ubunutu 9.04, and one of the nice new features is a firewall – which Canonical calls “Uncomplicated Firewall”. I’m usually not hooked on firewalls, but just for the fun of it I enabled the firewall on my laptop and it seems to work quite well. The firewall doesn’t seem to have any noticeable impact on system performance and as the laptop from time to time visits open wifi’s, it’s probably a good idea to have protection from other users on open networks.