Groesbeek, view of the 'National Liberation Museum 1944-1945' in Groesbeek. © Ton Kersten
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Archive for October 2008

How I broke the triple-e and repaired it

2008-10-19 (5) by Ton Kersten, tagged as old

Last weekend I decided it was time again to completely update my eeePC. So I ran the command tantrum everybody knows:

apt-get update
apt-get upgrade

and that gave me 287 new and updated packages.

After that I needed to reboot because I got a lot of new stuff.

Well, there the trouble began. No X, no network, no mouse, no USB etc. It was in a terrible state.

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Portforwarding without IPtables

2008-10-14 (4) by Ton Kersten, tagged as old

Live's good and the problem is simple. Having a Linux server at home with two virtual machines running within VMware server, I would like to have a tunnel to the host OS and forward ports for smtp, imap, rdp and maybe some others.

I thought this could simply be solved with IPtables, but that turned out to be a big pain in the *ss. It didn't work as I wanted, I locked myself out several times and still it didn't do exactly as I wanted.

Telling a coworker of mine (Thanks Jacco) he stumbled on a simple tool, called rinetd. It can only do one thing, but does that very well. It can forward an incoming TCP port request to another machine on any port. The configuration is so simple, anybody can understand it, even I did.

My config looks like:

logfile /var/log/rinetd.log
logcommon   25   25   83   83  143  143 3389 3389

Start the daemon with this config file and everything works. Could not be easier.

To bad nobody maintains this, my version is dated 2003-04-13. Maybe I will, when time permits.

Take a look at the rinetd homepage and be amazed.

MDNS name resolving problem

2008-10-14 (3) by Ton Kersten, tagged as old

Within a mixed Linux and Microsoft Windows network I ran into the following problem:

A host with the hostname linux1.firm.local could be pinged and found with nslookup and dig, but it was impossible to start a ssh session. The result kept being: Unknown host.

Playing Cherlock Holmes revealed that this had to do with Avahi and mdns, so with the .local part of the hostname.

In my /etc/nsswitch.conf the hosts: line read: (Using Ubuntu 8.04)

hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4

This results in searching the IP address of the host through mdns4_minimal. The .local domain now spoils it for me (use strings on mdns4_minimal and be amazed.

The problem can be solved very easy. Just replace the hosts: line in the /etc/nsswitch.conf with:

hosts: files dns mdns4

See also: Avahi