Re: [Qemu-devel] Is there any approach to setup guest only network

[郭沐錫 <maxgreg13625@gmail.com>]

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Dear all

I have set two directory for QEMU.

One of my qemu-ifup is as follow(the other ip address is different)

*#!/bin/sh*
*sudo modprobe tun*
*sudo /sbin/ifconfig $1 up 192.168.2.52 netmask 255.255.255.0 broadcast
192.168.2.255*
* *
*# IP masquerade*
*sudo echo "1" > /proc/sys/net/ipv4/ip_forward*
*sudo /sbin/iptables -N nat*
*sudo /sbin/iptables -t nat -F*
*sudo /sbin/iptables -t nat -A POSTROUTING -s 192.168.2.62 -j MASQUERADE*
*sudo /sbin/iptables -t nat -A POSTROUTING -d 192.168.2.62 -o $1*

As the QEMU start, I would key in two instructions

*ifconfig eth0 192.168.2.62*
*route add default gw 192.168.2.52*

In the case of mac address, I have found that two QEMU use the same mac
address.

However, when I try to assign another mac address to second QEMU.

*sudo /home/sn/qemu/qemu-0.12.5/install_gcc/bin/qemu-system-arm -M
versatilepb -monitor stdio -kernel vmlinuz-2.6.26-2-versatile -initrd
initrd.img-2.6.26-2-versatile -hda test.img -append "root=/dev/sda1" -net
nic,macaddr=52:54:00:12:34:57 -net tap,script=./qemu-ifup*

The eth0 will disappear like this

http://myweb.ncku.edu.tw/~p76991028/eth0.png

I can't realize why this would happen.

Please tell me where I was wrong.

2010/11/16 Mulyadi Santosa <mulyadi.santosa@gmail.com>

> On Tue, Nov 16, 2010 at 17:11, 郭沐錫 <maxgreg13625@gmail.com> wrote:
> > Dear all
> > I have run QEMU with debian
> > I can use TUN/TAP to connect the internet or host when single QEMU
> > However when I run two QEMU with two qemu-ifup and different address (on
> the
> > same host) at the same time, the second QEMU cannot connect to host...
> > Is there are any approach to setup guest only network.
> > Because I want to run ssh among the QEMUs on the same host.
>
> Try to paste your complete command together with the parameters you
> used in this list. Hopefully then we could analyze it.
>
> PS: have you assigned different mac address on both guests?
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>

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