I’ve been using Arch Linux for almost a year now and so far upgrades caused no issues or just required minor fine-tuning.

Until now.

Yesterday glibc got updated to 2.10.1-2 and since then DNS does not work for me anymore. I can ping hosts but whenever an application tries to resolve a host name a timeout error occurs. I read somewhere this is likely due to some IPv6 problem of my router’s DNS server. Forced usage of IPv4 as in wget -4 nzz.ch still works but obviously this is no solution.

I normally like to fix those things on my own, (Firmware Update?, OpenDNS?) but my Bachelor Thesis’ deadline approaches so I just downgraded again with a simple

pacman -U /var/cache/pacman/pkg/glibc-2.9-7-i686.pkg.tar.gz