Lynn Kerby schrieb: > > On Nov 21, 2007, at 12:52 PM, Mike wrote: > >> Hello, >> I have a problem with my virtual machines. I am using kvm53 >> on an AMD Athlon(tm) 64 X2 Dual Core Processor 5000+. >> As distribution I use Ubuntu server 7.10. >> As kernel I use Linux 2.6.22-14-server #1 SMP Sun Oct 14 22:09:15 GMT >> 2007 x86_64 GNU/Linux. >> >> I have 3 different vms running. At the beginning they all work >> without a problem. >> Then, after one moment to another one or more stop working. >> I did a ping test to all the machines, the vm with the failure stops >> pinging. >> The result from external ping: Destination host unreachable. >> The same result from a ping onto the main server. >> >> Here are my configuration files: >> cat /etc/qemu-ifup >> #!/bin/sh >> /sbin/ifconfig $1 0.0.0.0 promisc up >> /usr/sbin/brctl addif br0 $1 >> sleep 2 >> cat /etc/network/interfaces >> auto lo >> iface lo inet loopback >> >> auto br0 >> iface br0 inet static >> address 195.24.77.169 >> netmask 255.255.255.0 >> gateway 195.24.77.1 >> bridge_ports eth0 >> bridge_stp off >> bridge_maxwait 5 >> I use scripts for starting the vms: >> kvm -hda apache.img -hdb apache_storage.img -m 512 -boot c -net >> nic,vlan=0,macaddr=00:16:3e:00:00:01 -net tap -nographic -daemonize >> kvm -hda postfix.img -m 512 -boot c -net >> nic,vlan=0,macaddr=00:16:3e:00:00:12 -net tap -nographic -daemonize >> kvm -hda openvpn.img -m 256 -boot c -net >> nic,vlan=0,macaddr=00:16:3e:00:00:03 -net tap -nographic -daemonize >> The tapN devices are being created at the startup of the vms. >> >> When I run dmesg I have this: >> [ 112.390943] br0: port 2(tap1) entering learning state >> [ 112.391919] br0: port 3(tap0) entering learning state >> [ 112.397605] br0: port 4(tap2) entering learning state >> [ 122.674313] tap0: no IPv6 routers present >> [ 122.729185] tap1: no IPv6 routers present >> [ 122.843901] tap2: no IPv6 routers present >> [ 123.336081] kvm: emulating exchange as write >> [ 127.367940] br0: topology change detected, propagating >> [ 127.367949] br0: port 4(tap2) entering forwarding state >> [ 127.362971] br0: topology change detected, propagating >> [ 127.362977] br0: port 2(tap1) entering forwarding state >> [ 127.362978] br0: topology change detected, propagating >> [ 127.362980] br0: port 3(tap0) entering forwarding state >> >> No indication of a problem, nowhere in the log files. >> >> I don't know if the vms are freezing, or the network forwarding stops >> working. >> I also activated "net.ipv4.conf.default.forwarding=1" >> >> I googled days for that problem, but without a result. >> I hope that maybe you have a solution for this problem. That would be >> great, because I prefer using kvm instead of other virtualization >> systems. >> >> Thank you very much in advance, >> Greetings from Luxembourg. >> >> Have a nice day, >> Mike > > I had similar problems for my first week or so of trying to use KVM > for my virtualization needs. My problem was solved by adding a > "model=rtl8139" to the first -net option on the kvm/qemu command. The > default ne2k emulation seems to be broken. Another possibility is > problems with macaddr. In my testing I found that several of my > machines were getting the same macaddr by default so now I specify > them explicitly for each VM (or generate a dummy one based on the time > for testing). > > An example from one of my KVMMs (hopefully line wrapping won't > interfere): > > /usr/local/bin/qemu-system-x86_64 -name DOM9-BSD62 -hda > /vm_img/bsd_in1/dom9-disk1.qcow \ > -hdb /vm_img/bsd_in1/dom9-disk2.raw -m 512 -boot c -smp 2 -usb > -usbdevice tablet -vnc :9 \ > -serial telnet::4109,server,nowait -monitor > telnet::4209,server,nowait \ > -net nic,vlan=0,macaddr=52:54:09:12:34:56,model=rtl8139 \ > -net tap,vlan=0,ifname=tap1,script=/etc/kvm/kvm-ifup > > > Lynn Kerby > It's working now. I added model=rtl8139 to the start command of all vms. Now, the network connection works without problems. I did a test the whole night long. Thank you for your help.
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