[Bug 715152] Re: ntp wont run on IPv6 only host unless lo has 127.0.0.1 address

[James Page]

** Description changed:

  IMPACT:
  Ubuntu instances running in pure IPv6 environments (including 127.0.0.1) cannot run ntp as it dies when scanning for available interfaces.
  
  FIX:
  IPv6/IPv4 scanning has been improved in later releases; patch created from later release to resolve this issue (directly attached to this bug report).
  
- TESTING:
+ TEST CASE:
  1) On a working system with IPv4 & IPV6:
-   sudo apt-get install ntp
-   netstat -a | grep ntp
+   sudo apt-get install ntp
+   netstat -a | grep ntp
  Ports should be mapped for both udp and udp6
  
  2) Disable IPv4
  Add the following line to /etc/network/interfaces to disable 127.0.0.1:
  
  iface lo inet loopback
-     post-up ip addr del 127.0.0.1/8 dev lo
+     post-up ip addr del 127.0.0.1/8 dev lo
  
  And remove the line(s) relating to IPv4 configuration of other network
  interfaces (looks like iface eth* inet dhcp|static*)
  
  3) Reboot server
  
  4) NTP service will not be running; messages in /var/log/syslog relating to startup of daemon; however no daemon running
-    ps -aef | grep ntp
-    netstat -a | grep ntp
+    ps -aef | grep ntp
+    netstat -a | grep ntp
  
  IMPACT:
  Patch is relatively minimal and comes from later release.
  
  >>>> ORIGINAL BUG REPORT <<<<<
  
  Binary package hint: ntp
  
  Lucid host running IPv6 only, with network configured like this:
  
  root at svn:~# ifconfig
  eth0      Link encap:Ethernet  HWaddr 00:50:56:86:00:15
            inet6 addr: 2001:610:148:dead:cafe:babe:0:29/64 Scope:Global
            inet6 addr: fe80::250:56ff:fe86:15/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:3164 errors:0 dropped:0 overruns:0 frame:0
            TX packets:2075 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000
            RX bytes:1516490 (1.5 MB)  TX bytes:387497 (387.4 KB)
  
  lo        Link encap:Local Loopback
            inet6 addr: ::1/128 Scope:Host
            UP LOOPBACK RUNNING  MTU:16436  Metric:1
            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0
            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
  
  Now ntpd wont start:
  
  ./../libisc/ifiter_ioctl.c:567: REQUIRE(iter->pos < (unsigned int) iter->ifc.ifc_len) failed.
  Aborted
  
  After adding an IPv4 loopback address to lo interface:
  
  ip addr add 127.0.0.1 dev lo
  
  ntpd is able to start.
  
  According to http://bugs.ntp.org/show_bug.cgi?id=397 this might be
  related to libisc.

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https://bugs.launchpad.net/bugs/715152

Title:
  ntp wont run on IPv6 only host unless lo has 127.0.0.1 address