http://uranus.it.swin.edu.au/~jn/ is gone... These are the first Google hit for "ndu dns" and actually work. http://www.chrysocome.net/ndu http://www.chrysocome.net/downloads/ndu-0.4.tar.gz
@Robin: The new tarball differs in content!
That tarball is modified with the RHEL patches directly applied. It's not the original upstream that has just moved at all. I think we just leave homepage dead for now.
At this time the HOMEPAGE and the SRC_URI are back online. There isn't any problem getting the package to your system.
reopening, because it is dead again since a long time. $ GENTOO_MIRRORS="" ebuild ndu-0.4-r4.ebuild fetch 2019-01-10 14:10:49 ERROR 404: Not Found. it is only in Gentoo https://repology.org/metapackage/ndu/versions