Comment 10 for bug 175316

IDN support would be really nice to have. Unfortunately, not even Ubuntu 16.04 has it yet:

Ubuntu 16.04 (Xenial Xerus):

nornetpp@experiment:~$ host bjørvika.uio.nornet
Host bjørvika.uio.nornet not found: 3(NXDOMAIN)
nornetpp@experiment:~$ nslookup bjørvika.uio.nornet
Server: 10.1.1.1
Address: 10.1.1.1#53

** server can't find bj\195\184rvika.uio.nornet: NXDOMAIN

nornetpp@experiment:~$ ping bjørvika.uio.nornet
ping: unknown host bjørvika.uio.nornet
nornetpp@experiment:~$ ping6 bjørvika.uio.nornet
unknown host
nornetpp@experiment:~$ dig bjørvika.uio.nornet

; <<>> DiG 9.10.3-P4-Ubuntu <<>> bjørvika.uio.nornet
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 61159
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;bj\195\184rvika.uio.nornet. IN A

;; AUTHORITY SECTION:
uio.nornet. 3600 IN SOA blindern.uninett.uio.nornet. root.uio.nornet. 57669665 900 60 84600 3600

;; Query time: 1 msec
;; SERVER: 10.1.1.1#53(10.1.1.1)
;; WHEN: Thu May 12 13:56:07 CEST 2016
;; MSG SIZE rcvd: 107

On the other hand, Fedora Core 23 has is enabled by default. So, it should not be too difficult to support it in Ubuntu as well.

Fedora Core 23:

[root@queenstown ~]# host bjørvika.uio.nornet
bjørvika.uio.nornet is an alias for bjoervika.uninett.uio.nornet.
bjoervika.uninett.uio.nornet has address 10.1.2.100
bjoervika.uninett.uio.nornet has IPv6 address (address removed)
[root@queenstown ~]# nslookup bjørvika.uio.nornet
Server: 10.1.1.1
Address: 10.1.1.1#53

bjørvika.uio.nornet canonical name = bjoervika.uninett.uio.nornet.
Name: bjoervika.uninett.uio.nornet
Address: 10.1.2.100

[root@queenstown ~]# ping -c1 bjørvika.uio.nornet
PING bjoervika.uninett.uio.nornet (10.1.2.100) 56(84) bytes of data.
64 bytes from bjoervika.uninett.uio.nornet (10.1.2.100): icmp_seq=1 ttl=62 time=3.84 ms

--- bjoervika.uninett.uio.nornet ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 3.844/3.844/3.844/0.000 ms
[root@queenstown ~]# ping6 -c1 bjørvika.uio.nornet
PING bjørvika.uio.nornet(bjoervika.uninett.uio.nornet) 56 data bytes
64 bytes from bjoervika.uninett.uio.nornet: icmp_seq=1 ttl=62 time=5.67 ms

--- bjørvika.uio.nornet ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 5.673/5.673/5.673/0.000 ms
[root@queenstown ~]# dig bjørvika.uio.nornet any

; <<>> DiG 9.10.3-P4-RedHat-9.10.3-12.P4.fc23 <<>> bjørvika.uio.nornet any
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62089
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;bjørvika.uio.nornet. IN ANY

;; ANSWER SECTION:
bjørvika.uio.nornet. 86400 IN CNAME bjoervika.uninett.uio.nornet.

;; AUTHORITY SECTION:
uio.nornet. 86400 IN NS ns.simula.nornet.
uio.nornet. 86400 IN NS blindern.uninett.uio.nornet.

;; ADDITIONAL SECTION:
blindern.uninett.uio.nornet. 86400 IN A 10.1.2.1
blindern.uninett.uio.nornet. 86400 IN AAAA (address removed)

;; Query time: 1 msec
;; SERVER: 10.1.1.1#53(10.1.1.1)
;; WHEN: to. mai 12 13:59:19 CEST 2016
;; MSG SIZE rcvd: 178