Forgot to mention that while qemu is running with RTEMS telnetd.exe, (with ETH0IP set to 48) from the host I get ping response from 47 and 48. But I cannot ping to google.com. and when I type in the password at telnet, I can get in to both. (but couple of times got 'connection close by foreign host.' I remember) Thanks a lot. Chan Kim
보낸 사람 : "김찬" <c...@etri.re.kr> 보낸 날짜 : 2014-09-18 22:00:32 ( +09:00 ) 받는 사람 : qemu-discuss@nongnu.org <qemu-discuss@nongnu.org> 참조 : 제목 : need help in setting up tap networking for using qemu virtual machine Hello, everyone! It's good to have some people to ask this.. I really need a help from you and this should be a basic question. I'm trying to run a virtual machine (using qemu-system-sparc, I added lan9220 emulation model inside) on my CentOS 6.4 machine. I've read [url]http://www.linuxquestions.org/questions/linux-virtualization-and-cloud-90/centos-6-and-kvm-how-to-setup-bridged-networking-in-kvm-in-a-class-b-environment-4175433990/[/url] but my case seems different and I am not sure if this previous post is correct or not. My host ip is 129.254.132.47. and I want my virtual machine to be 129.254.132.48. (it's class B network) I have /etc/qemu-ifup like this --------------------- start ------------------------- #!/bin/sh # # script to bring up the tun device in QEMU in bridged mode # first parameter is name of tap device (e.g. tap0) # # some constants specific to the local host - change to suit your host # # guest 132.48 host 132.47 bridge 132.64 set -x ETH0IP=129.254.132.47 GATEWAY=129.254.132.1 BROADCAST=129.254.255.255 # # First take eth0 down, then bring it up with IP address 0.0.0.0 # /sbin/ifdown eth0 /sbin/ifconfig eth0 0.0.0.0 promisc up # # Bring up the tap device (name specified as first argument, by QEMU) # /usr/sbin/openvpn --mktun --dev $1 --user `id -un` /sbin/ifconfig $1 0.0.0.0 promisc up # # create the bridge between eth0 and the tap device # /usr/sbin/brctl addbr br0 /usr/sbin/brctl addif br0 eth0 /usr/sbin/brctl addif br0 $1 # # only a single bridge so loops are not possible, turn off spanning tree protocol # /usr/sbin/brctl stp br0 off # # Bring up the bridge with ETH0IP and add the default route # /sbin/ifconfig br0 $ETH0IP netmask 255.255.0.0 broadcast $BROADCAST /sbin/route add default gw $GATEWAY # # stop firewall - comment this out if you don't use Firestarter # #/sbin/service firestarter stop --------------------- end ------------------------- and /etc/qemu-ifdown as ------------------- start -------------------------- #!/bin/sh # # Script to bring down and delete bridge br0 when QEMU exits # # Bring down eth0 and br0 # set -x /sbin/ifdown eth0 /sbin/ifdown br0 /sbin/ifconfig br0 down # # Delete the bridge # /usr/sbin/brctl delbr br0 # # bring up eth0 in "normal" mode # /sbin/ifconfig eth0 -promisc /sbin/ifup eth0 # # delete the tap device # /usr/sbin/openvpn --rmtun --dev $1 # # start firewall again # #/sbin/service firestarter start -------------------- end -------------------------- and I start my virtual machine with this command : qemu-system-sparc -M ALDEBARAN -serial stdio -kernel telnetd/o-optimize/telnetd.exe -net nic -net tap,ifname=tap0 (this makes /etc/qemu-ifup tap0 and /etc/qemu-ifdown tap0 run before and after qemu run.) When I run above command, I can see the virtual machine's code is running. (it's RTEMS network-demo program. telnetd.exe) From outside the host, I can ping to host and the guest. So I thought everything is fine But I then I found something is wrong.. When I telnet to 129.254.132.47, it is centOS as expected. But when I telnet to 129.254.132.48, it takes unusually long (like 10 seonds?) then I see the loging prompt coming from CentOS.(the host) I can log into it, and it's my host machine. (By the way, both telnetting looked hampered by something, like interfering one another by wrong setting..) I can run the same telnetd program using actual board the qemu emulator is emulating, and I can telnet to the board (and of course it's RTEMS). Only, when using actual board, I use physical network cable between my host and the board. (host 10.10.10.1 and the board 10.10.10.11) I tried setting ETH0IP to 129.254.132.47 in qemu-ifup script but it didn't work. Please anyone tell me what the problem is.. Kind regards, Chan Kim
