From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue,  7 Jan 2014 17:25:14 -0500
From: plannine@sigint.cs.purdue.edu
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Message-ID: <20140107222514.GD23955@sigint.cs.purdue.edu>
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Subject: Re: [9fans] qemu and networking
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On Tue, Jan 07, 2014 at 10:16:02PM +0000, Yoann Padioleau wrote:
> qemu -hda Plan9.qcow2.img -net nic -net user
>
> but from plan9 when I do
>
>  rc> ip/ping 10.0.2.2 nothing happens.

The user-mode (SLIRP) network stack in QEMU doesn't support ICMP.

http://wiki.qemu.org/Documentation/Networking#User_Networking_.28SLIRP.29