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[Bug 1352255] [NEW] Impossible to configure network interface with only IPv6 address

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1352255@xxxxxxxxxxxxxxxxxx>
Date: Fri, 12 Sep 2014 23:41:57 -0000
Reply-to: Bug 1352255 <1352255@xxxxxxxxxxxxxxxxxx>
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As it says on the tin.
I'm unable to configure my Ubuntu 14.04 VM to have only an IPv6 address on boot-up.
Dual stack works fine.

My /etc/networking/interfaces looks like this:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet6 static
        address 2001:610:188:444::55
        netmask 64
        gateway 2001:610:188:444::1
        autoconf 0
        privext 0
        accept_ra 0
        dns-search terena.org
        dns-domain terena.org
        dns-nameservers 2001:610:1:800a:192:87:106:106


After boot-up there is only a link-local address:

root@trusty-test:~# ifconfig                                                                        
eth0      Link encap:Ethernet  HWaddr 00:50:56:95:42:ab                                             
          inet6 addr: fe80::250:56ff:fe95:42ab/64 Scope:Link                                        
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                                        
          RX packets:101 errors:0 dropped:0 overruns:0 frame:0                                      
          TX packets:22 errors:0 dropped:0 overruns:0 carrier:0                                     
          collisions:0 txqueuelen:1000                                                              
          RX bytes:6644 (6.6 KB)  TX bytes:2132 (2.1 KB)                                            
                                                                                                    
lo        Link encap:Local Loopback                                                                 
          inet addr:127.0.0.1  Mask:255.0.0.0                                                       
          inet6 addr: ::1/128 Scope:Host                                                            
          UP LOOPBACK RUNNING  MTU:65536  Metric:1                                                  
          RX packets:240 errors:0 dropped:0 overruns:0 frame:0                                      
          TX packets:240 errors:0 dropped:0 overruns:0 carrier:0                                    
          collisions:0 txqueuelen:0                                                                 
          RX bytes:18192 (18.1 KB)  TX bytes:18192 (18.1 KB)                                        
                                                                                                    
However, if I manually ifdown/ifup the interface, then things start working:

root@trusty-test:~# ifdown eth0                                                                     
root@trusty-test:~# ifconfig                                                                        
lo        Link encap:Local Loopback                                                                 
          inet addr:127.0.0.1  Mask:255.0.0.0                                                       
          inet6 addr: ::1/128 Scope:Host                                                            
          UP LOOPBACK RUNNING  MTU:65536  Metric:1                                                  
          RX packets:240 errors:0 dropped:0 overruns:0 frame:0                                      
          TX packets:240 errors:0 dropped:0 overruns:0 carrier:0                                    
          collisions:0 txqueuelen:0                                                                 
          RX bytes:18192 (18.1 KB)  TX bytes:18192 (18.1 KB)                                        
                                                                                                    
root@trusty-test:~# ifup eth0                                                                       
Waiting for DAD... Done                                                                             
root@trusty-test:~# ifconfig                                                                        
eth0      Link encap:Ethernet  HWaddr 00:50:56:95:42:ab                                             
          inet6 addr: fe80::250:56ff:fe95:42ab/64 Scope:Link                                        
          inet6 addr: 2001:610:188:444::55/64 Scope:Global                                          
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                                        
          RX packets:894 errors:0 dropped:0 overruns:0 frame:0                                      
          TX packets:652 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:168407 (168.4 KB)  TX bytes:95052 (95.0 KB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:288 errors:0 dropped:0 overruns:0 frame:0
          TX packets:288 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:21792 (21.7 KB)  TX bytes:21792 (21.7 KB)


FYI, I have many 12.04 LTS VMs that work fine with the same configuration.

Many thanks!!!

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment ipv6 ipv6-only trusty
-- 
Impossible to configure network interface with only IPv6 address
https://bugs.launchpad.net/bugs/1352255
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