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[Bug 1023174] Re: "ip -6 addr flush" flushes much more than just the addresses

 

Tested on 3.12.0-5-generic kernel and problem is still there.

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https://bugs.launchpad.net/bugs/1023174

Title:
  "ip -6 addr flush" flushes much more than just the addresses

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  root@testv6-tester:~# ls /proc/sys/net/ipv*/conf/
  /proc/sys/net/ipv4/conf/:
  all  default  eth0  lo  sit0

  /proc/sys/net/ipv6/conf/:
  all  default  eth0  lo  sit0
  root@testv6-tester:~# ip addr flush dev eth0
  root@testv6-tester:~# ls /proc/sys/net/ipv*/conf/
  /proc/sys/net/ipv4/conf/:
  all  default  eth0  lo  sit0

  /proc/sys/net/ipv6/conf/:
  all  default  lo  sit0

  
  This results in no IPv6 connectivity on the interface and no obvious way to get it back to working condition other than destroying and recreating the interface (usually by rebooting).

  
  I reproduced this on the stable 12.04 kernel (3.2.0-26-generic) as well as 12.10 (3.5.0-3-generic).

  This is currently breaking ipv6 connectivity for some dual-stack
  setups in debian-installer though only for Ubuntu 12.10 (because the
  flush call was ipv4-specific in 12.04). I'll workaround the issue in
  d-i, but this bug should really be looked into.

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