Would be nice if iputils/ping would have idn-support. There's a patch at fedora, worked for me: http://cvs.fedoraproject.org/viewcvs/*checkout*/rpms/iputils/devel/iputils-20070202-idn.patch?rev=1.2
you should send the same request to the maintainer: http://www.linux-foundation.org/en/Net:Iputils
the fedora patch is pretty lame ... it forces idn on all over the place when you e-mail upstream, refer them to our version instead http://sources.gentoo.org/net-misc/iputils/files/iputils-20070202-idn.patch?rev=1.1