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Re: [Qemu-discuss] About how to connect from guest "" to remote

From: Mike Lovell
Subject: Re: [Qemu-discuss] About how to connect from guest "" to remote "192.168.1.xx"
Date: Tue, 14 Feb 2012 17:56:04 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20111108 Lightning/1.0b2 Thunderbird/3.1.16

it does match. i just now ran a test and i was able to ping but not able to ping anything else. despite not being able to ping outside the network, i was able to do the wget i listed before and connectivity to the rest of the world works. don't expect ping to be a good test when using user networking and talking to things outside of


On 02/14/2012 05:30 PM, Qi Zhang wrote:
        My guest can ping to host with the address but just
can't ping to host's LAN interface, does that match with
your point?
Zhang Qi

On Wed, Feb 15, 2012 at 1:33 AM, Mike Lovell<address@hidden>  wrote:
On 02/14/2012 02:21 AM, Qi Zhang wrote:
Hi There:

         I'm trying to use QEMU to emulate a simple Linux Guest for
some specific task
         I have download/compile the Linux 3.2.5 kernel and busybox
1.19.4 and successfully make the guest system running after some
simple setup.
         Also the guest system can mount host NFS after I set the eth0
IP to  (mount -t nfs /tmp)

         Now the host system is also connect to a LAN (,
and there is application running on the guest system, who want to talk
to another server on the LAN (
         but guest ( can't ping to the remote server
         I have manually add the default gateway as, that
still not work.
         Destination     Gateway         Genmask         Flags Metric
Ref    Use Iface         UG    0      0
        0 eth0       U     0      0
        0 eth0

         Can anybody help me to figure it out?
         Wish the solution is not about use the tap/bridge solution,
         I was lack of related network knowledge and the only thing I
know is use QEMU "user net" is something similar as "NAT" option in
virtual box,
         though when use NAT the host can't ping to guest, but the
guest can ping to everywhere and there is no bridge I think

         my host system is Ubuntu 11.10 and the command to start the QEMU
         "qemu-system-x86_64 -kernel arch/x86/boot/bzImage -boot d
-append 'console=ttyS0, 115200' -nographic -net nic -net user"

if i remember correctly, the user networking doesn't support ping or various
other ICMP messages. it uses a limited IP stack directly in the qemu process
and doesn't support everything that the kernel's IP stack supports. after
you set the ip address and default gateway in the guest, try connecting to
the service you want to talk to or try putting a web page through wget. i
frequently just use `wget http://google.com/` to test network connectivity
when using user networking.


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