See the file COPYING for copying restrictions. This package contains ypcat, ypmatch, ypset, ypwhich, yppasswd, domainname, nisdomainname and ypdomainname. yp-tools 4.x has full NIS IPv6 support if compiled and linked against libnsl >= 1.0.4 and libtirpc >= 1.0.1. yp-tools should be compiled on Linux against libnsl from https://github.com/thkukuk/libnsl or http://www.linux-nis.org/download/libnsl/ Support for the glibc libnsl and sunrpc is deprecated, since the glibc version of libnsl and sunrpc are in maintenance mode and may be removed in the future.