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RE: how to setup user mode network backend and test it?

From: ckim
Subject: RE: how to setup user mode network backend and test it?
Date: Fri, 16 Apr 2021 07:35:18 +0900

Hello Peter Maydell,

I thought I can set real IP address to the VM(I know with tap networking it's 
possible). 129.254.254.x is the address used in our department.
OK, I'll understand that, with just "-netdev user,id=n1 -device 
e1000,netdev=n1" option, there are DHP server, DNS server and SMB server at 
10.0.2.x as shown in the document provided to me. The document says "You can 
use a DHCP client to automatically configure the network in the QEMU VM. The 
DHCP server assigns addresses to the hosts starting from" Then, do I 
get automatically? After linux boots, I don't see that address 
assigned to eth0. My initial eth0 state is like this (no IP address)

2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff

How should I 'run dhcp client'? (maybe I don't know how I can set linux Image 
to use DHCP for network setting, I tried ip=dhcp in kernel command line to no 

Also, in the document it says : "you can download the linux-test-xxx.tar.gz 
archive and copy the script qemu-ifup in /etc", but where can I get this 
linux-test-xxx.tar.gz file? (I have used tap networking for qemu and rtems in 
the past and have those scripts on another machine, but I'm not sure they are 
correct/optimal, there are several variants/blocked commands I tried).

Thank you!
Chan Kim

> -----Original Message-----
> From: Peter Maydell <peter.maydell@linaro.org>
> Sent: Thursday, April 15, 2021 10:41 PM
> To: Chan Kim <ckim@etri.re.kr>
> Cc: qemu-discuss <qemu-discuss@nongnu.org>
> Subject: Re: how to setup user mode network backend and test it?
> On Thu, 15 Apr 2021 at 14:22, <ckim@etri.re.kr> wrote:
> > I tried qemu networking but it doesn’t work and I can’t figure out what
> is wrong.
> >
> > I first tried “-netdev user,id=n1 -device e1000,netdev=n1” as network
> option,(I added e1000 driver in the linux kernel build too.).
> >
> > By `ip link show` I can see there is the ‘eth0’ interface. So I gave
> > commands below
> >
> >
> >
> > ifconfig eth0 netmask up
> >
> > route add default gw
> Where are you getting these IP addresses from ?
> The usual thing with user mode networking is to run a dhcp client inside
> the guest and let that deal with it (there is a fake DHCP server provided
> by QEMU that the guest will see on the usermode network). You should get
> an address in the 10.0.2.x range.
> https://qemu-project.gitlab.io/qemu/system/net.html#using-the-user-mode-
> network-stack
> thanks
> -- PMM

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