Kernel 2.6, Fedora, and ECN - or "Why do I get connection refused / timed out on website so-and-so?"

  • Posted on: 8 April 2004
  • By: agittins

People too slack to run a decent firewall (like whoever carries the traffic between me and won't be getting too many hits from Fedora users who have updated to kernel 2.6. Unless said users bother to find out this little nugget - 2.6 Kernels in Fedora ship with ECN enabled. Huh? What's ECN? It's Explicit Congestion Notification, nicely overviewed here by Peter Samuelson, and it helps hosts to more efficiently negotiate just how many bits they can ram down each other's throats without going backwards. The problem is that some crappy firewalls and routers (ie, outdated and bad, or just bad) will drop packets that have ECN enabled on them. They shouldn't, but they do. There are two ways to get around this:

Building Rosegarden (maybe other Qt apps) on x86_64 / Fedora Core 1 & FC2

  • Posted on: 6 April 2004
  • By: agittins

Configure/LD fails to find or link to libqt-mt

This is not likely to be useful for anyone on it's own, but nonetheless it's something I had to do on my system to make Rosegarden-4 (a midi sequencer) build on my amd64 system.
Using the planet-ccrma src rpm, configure failed while detecting Qt. Investigation of config.log shows that ld (the linker) is failing to find libqt-mt. On FC1, that's in /usr/lib64/qt-[ver]/lib/, but the config script/ld looked only in /usr/lib64/qt-[ver]/lib64/, which kinda makes sense, but alas there be no library in those waters. Solution:

Dispelling the Urban Legend that surrounds the Australian Dropbear

Copyright 2002 Ashley Gittins
It is a disturbing trend, but many people seem to take great pleasure in
spreading fear and mis-information. Sadly, the Australian Dropbear is another
victim of this type of treatment. For many years, visitors to Australia have
been warned of this almost mythical sounding creature which stalks the forest
canopy, waiting for a meal to pass by below. Whilst wide-eyed newcomers are
listening intently to this new information, the informant-turned-storyteller
may stoop to embelishment. This is unacceptable, as the threat posed to
humans by the Dropbear is very real, and should be treated with the utmost