[Bug 1218442] [NEW] IPv6 addresses are lost when an interface is shortly down

[Thomas Dreibholz]

Public bug reported:

/etc/network/interfaces has been configured with IPv4 and IPv6 addresses
on an interface. There are two networks each:

$ ip -4 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    inet 10.1.1.51/24 brd 10.1.1.255 scope global eth0
    inet 10.2.1.51/24 brd 10.2.1.255 scope global eth0

$ ip -6 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 xxxx:yyyy:zzzz:201::33/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 xxxx:yyyy:zzzz:101::33/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::aaaa:aaff:febb:ccdd/64 scope link 
       valid_lft forever preferred_lft forever

(Global addresses and MAC address anonymized)

Both are configured within "manual" entries in /etc/network/interfaces.


When I turn down eth0 and bring it up again, the result is:

$ ip -4 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    inet 10.1.1.51/24 brd 10.1.1.255 scope global eth0
    inet 10.2.1.51/24 brd 10.2.1.255 scope global eth0

$ ip -6 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 fe80::aaaa:aaff:febb:ccdd/64 scope link 
       valid_lft forever preferred_lft forever

That is, the global IPv6 addresses are lost.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ifupdown 0.7.5ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
Uname: Linux 3.8.0-29-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Thu Aug 29 16:28:46 2013
InstallationDate: Installed on 2013-08-14 (14 days ago)
InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: ifupdown
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug raring

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https://bugs.launchpad.net/bugs/1218442

Title:
  IPv6 addresses are lost when an interface is shortly down

Status in “ifupdown” package in Ubuntu:
  New

Bug description:
  /etc/network/interfaces has been configured with IPv4 and IPv6
  addresses on an interface. There are two networks each:

  $ ip -4 addr show dev eth0
  2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
      inet 10.1.1.51/24 brd 10.1.1.255 scope global eth0
      inet 10.2.1.51/24 brd 10.2.1.255 scope global eth0

  $ ip -6 addr show dev eth0
  2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qlen 1000
      inet6 xxxx:yyyy:zzzz:201::33/64 scope global 
         valid_lft forever preferred_lft forever
      inet6 xxxx:yyyy:zzzz:101::33/64 scope global 
         valid_lft forever preferred_lft forever
      inet6 fe80::aaaa:aaff:febb:ccdd/64 scope link 
         valid_lft forever preferred_lft forever

  (Global addresses and MAC address anonymized)

  Both are configured within "manual" entries in
  /etc/network/interfaces.

  
  When I turn down eth0 and bring it up again, the result is:

  $ ip -4 addr show dev eth0
  2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
      inet 10.1.1.51/24 brd 10.1.1.255 scope global eth0
      inet 10.2.1.51/24 brd 10.2.1.255 scope global eth0

  $ ip -6 addr show dev eth0
  2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qlen 1000
      inet6 fe80::aaaa:aaff:febb:ccdd/64 scope link 
         valid_lft forever preferred_lft forever

  That is, the global IPv6 addresses are lost.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: ifupdown 0.7.5ubuntu2
  ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  Date: Thu Aug 29 16:28:46 2013
  InstallationDate: Installed on 2013-08-14 (14 days ago)
  InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MarkForUpload: True
  SourcePackage: ifupdown
  UpgradeStatus: No upgrade log present (probably fresh install)

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