http://wiki.grml.org/doku.php?id=terminalserver#grml_netboot_packages

Workaround: use mirror:
http://ftp.halifax.rwth-aachen.de/grml/grml_netboot_package_grml64-full_2013.02.tar.bz2

Details of redirect:

acolin@thinkpad grml$wget
http://download.grml.org/grml_netboot_package_grml32-full_2013.02.tar.bz2
--2013-03-25 00:04:50--
http://download.grml.org/grml_netboot_package_grml32-full_2013.02.tar.bz2
Resolving download.grml.org (download.grml.org)... 83.246.69.174,
2a02:790:1:12::6
Connecting to download.grml.org (download.grml.org)|83.246.69.174|:80...
connected.
HTTP request sent, awaiting response... 302 Found
Location: http:///grml_netboot_package_grml32-full_2013.02.tar.bz2
[following]
http:///grml_netboot_package_grml32-full_2013.02.tar.bz2: Invalid host name.