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

From: Qi Zhang
Subject: Re: [Qemu-discuss] About how to connect from guest "" to remote "192.168.1.xx"
Date: Wed, 15 Feb 2012 13:00:05 +0800

I have a web server on my host
and I try  wget, it works
but if I try on the LAN interface wget, it does
not, I have already added the default router as

Could you help to figure out what's missing part on my kernel
configure or QEMU command line?


On Wed, Feb 15, 2012 at 8:56 AM, Mike Lovell <address@hidden> wrote:
> 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
> mike
> On 02/14/2012 05:30 PM, Qi Zhang wrote:
>> Mike:
>>        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?
>> Thanks
>> 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
>>>>         BTW:
>>>>         my host system is Ubuntu 11.10 and the command to start the QEMU
>>>> is
>>>>         "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.
>>> mike

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