[Bug 1371246] [NEW] netns ifconfig problem

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I am using IP name space virtualization feature in Ubuntu 14.04. The simplest script for this is:
#! /bin/sh
ip netns add test
ip link set dev eth1 netns test
ip netns exec ip addr add 10.4.1.21/16 dev eth1
ip netns exec test ip link set dev eth1 up

The node has eth0 with 10.4.1.20/16 and connected eth0 to eth1 by
external cable.

All had worked fine during updating Ubuntu 14.04 at the 14th or 15th of
September. All is OK in Ubuntu 12.04 LTS.

After the starting script I have a wrong result for 'sudo ip netns exec
test ifconfig eth1' output as zero's broadcast address in test IP name
space. Command 'sudo ip netns exec test ping 10.4.21.1' has failed.

** Affects: iproute2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment netns
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netns ifconfig problem
https://bugs.launchpad.net/bugs/1371246
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