Interestingly, Ubuntu 16.04's traceroute supports IDN, but neither tracepath nor traceroute6/tracepath6:
nornetpp@experiment:~$ traceroute bjørvika.uio.nornet
traceroute to bjørvika.uio.nornet (10.1.2.100), 30 hops max, 60 byte packets
1 fornebu.uninett.simula.nornet (10.1.1.1) 0.947 ms 0.945 ms 0.942 ms
2 uninett.simula.uninett.uio.nornet (192.168.28.246) 3.111 ms 3.114 ms 3.110 ms
3 bjoervika.uninett.uio.nornet (10.1.2.100) 5.103 ms 5.153 ms 5.140 ms
nornetpp@experiment:~$ tracepath bjørvika.uio.nornet
gethostbyname2: Unknown host
nornetpp@experiment:~$ traceroute6 bjørvika.uio.nornet
traceroute: unknown host bjørvika.uio.nornet
nornetpp@experiment:~$ tracepath6 bjørvika.uio.nornet
getaddrinfo: Name or service not known
Interestingly, Ubuntu 16.04's traceroute supports IDN, but neither tracepath nor traceroute6/ tracepath6:
nornetpp@ experiment: ~$ traceroute bjørvika.uio.nornet uninett. simula. nornet (10.1.1.1) 0.947 ms 0.945 ms 0.942 ms simula. uninett. uio.nornet (192.168.28.246) 3.111 ms 3.114 ms 3.110 ms uninett. uio.nornet (10.1.2.100) 5.103 ms 5.153 ms 5.140 ms experiment: ~$ tracepath bjørvika.uio.nornet experiment: ~$ traceroute6 bjørvika.uio.nornet experiment: ~$ tracepath6 bjørvika.uio.nornet
traceroute to bjørvika.uio.nornet (10.1.2.100), 30 hops max, 60 byte packets
1 fornebu.
2 uninett.
3 bjoervika.
nornetpp@
gethostbyname2: Unknown host
nornetpp@
traceroute: unknown host bjørvika.uio.nornet
nornetpp@
getaddrinfo: Name or service not known