network namespace support in iproute2 tool

[rsa]

[posted this on the linux containers list as well.. not sure where
to go with this question]

I am wondering which version of the iproute2 package did
Eric Biederman's 'ip netns' command support is available.
I got the latest iproute2 but, I don't see any support in there.

Also what version of kernel has the the support for IFLA_NET_NS_FD
netlink attribute?

Appreciate your help.

thank you
ravi/
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