IPv6 WebCam

In der “IPv6 Toy Gallery” von SiXXs habe ich eine nette WebCam gefunden, die

  • IPv6 unterstützt
  • Outdoor fähig ist
  • vergleichsweise wenig kostet (175 €)

Leider hat auch sie nur die bei WebCams übliche Auflösung von 640×480 Punkten. Da die Kamera nativ IPv6 spricht, brauchen praktischerweise keine Portforwardings auf dem Router eingerichtet werden um von extern darauf zuzugreifen. Continue reading

commenting iptables rules

I often use iptables (or ip6tables, the IPv6 version of iptables) to implemented firewall rules on my linux systems.

In earlier times I used a commented bash script to setup the rules after booting, but using Gentoo nowadays there is a nice init script saving and restoring my tables. Using this I stopped commenting the firewall rules, but yesterday I found a very nice solution for this problem.

Iptables has a special “match” for comments. Continue reading

wget and IPv6

wget is THE standard Linux tool to download files via http(s) or ftp on console and of course Gentoo’s emerge is using wget as well.

But wget prefers IPv4 over IPv6, meaning if your download mirror supports IPv6, wget doesn’t use it by default. You can change this behavior by setting

prefer-family = IPv6

either in /etc/wgetrc for everybody or in $HOME/.wgetrc for a user only.

So enable it and tell portage to use an IPv6 enabled mirror, by setting GENTOO_MIRROR in /etc/make.conf. You’ll find a list of IPv6 capable mirrors on gentoo.org (look for mirrors marked with *).

Kernel 2.6.29: Kernel Mode Setting with Intel GM965

Kernel 2.6.29 introduced the Kernel Mode Setting feature, meaning the kernel to be able to change resolution and adresse other outputs. For example kernels pre 2.6.29 always actived the external DVI device (if connected) on my macbook and showed boot screens there. This is now configurable. Also switching between X11 and console is much faster. Continue reading