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Message #33240
[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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