14 Jan
2012
14 Jan
'12
5:22 p.m.
Dnia 2012-01-14, sob o godzinie 11:11 -0600, Trey Dockendorf pisze:
On Sat, Jan 14, 2012 at 8:41 AM, Radek Bursztynowski radek@bursztynowski.waw.pl wrote:
Dnia 2012-01-14, sob o godzinie 15:08 +0100, Dennis Jacobfeuerborn pisze: > On 01/14/2012 02:59 PM, Radek Bursztynowski wrote: > > Hi, > > > > I have installed CentOS 6.2 x86_64 and KVM/Qemu and I have some troubles > > with network. > > > > The first case: > > ----------------- > > > > The configuration is: > > - CentOS 6.2 (hardware machine) has one Ethernet interface with static IP > > address (eth0). > > - Virtual machine has bridge network interface with eth0 interface on > > CentOS 6.2. This bridge is created using wizard integrated with virt-manager. > > - Bridge interface on virtual machine receives IP addres from DHCP server. > > IP address is received well. > > - All firewalls and SELinux are closed. > > > > Virtual machine has no any connection with CentOS 6.2 hardware machine, and > > CentOS 6.2 has no any connection with virtual machine. But every others > > machines have all connection with both virtual and CentOS 6.2 machine. > > > > The question: Why? > > > > The second case: > > ---------------------- > > > > The configuration is: > > - On CentOS 6.2 (hardware machine) I created bridhe (br0) with eth0 > > hardware interface. Two situations: > > + I force two different IP addresses for eth0 and br0 interfaces - there no > > any connection with this server. So I don't test this case. > > + I forced one IP addres for both eth0 and br0 interfaces. ifconfig shows > > that eth0 has no IP address, br0 has IP address. So, I test this case. > > - I use Red Hat documentation: > > http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Virtualization/index.html#sect-Virtualization-Network_Configuration-Bridged_networking_with_libvirt) > > - On virtual machine I created bridge connection with br0 interface on > > CentOS 6.2. > > - All machines have all connections. > > - All firewalls and SELinux are closed. > > > > NFS server on CentOS 6.2 (hardware machine) doesn't serve exported file system. > > > > The questions: > > 1. Is it proper that eth0 has no IP addres and bridge (br0) interface has? > > 2. What about my NFS? NFS server worked well before starting virtualization. > > > > Who can me help with my troubles? > > You say you create bridge interfaces in your virtual machines. Why? Usually > you don't do that you create a bridge only on the host. > > You also say you "forced" one IP address for both eth0 and br0. There is no > need to force anything. eth0 shouldn't have an IP but br0 should have this > IP instead. > > Regards, > Dennis > _______________________________________________ Dennis, Thanks for interesting. Few words explanation. I have one network segment, and I try to joint virtual machines to this segment. So my hardvare machine has 192.168.0.1 address, gateway is 192.168.0.254, netmask = 255.255.255.0. Regarding bridge on my virtual machine. When I started virtualization I had NAT only in another network segment. So, I look for solution adding virtual machines to my base network segment. Previously I used VMware Server, and it was proper solution. Regarding my force one IP addres for both interface. I used this solution because eth0 has no any IP addres and I couldn't find CentOS 6.2 server in the network. Using exactly Red Hat configuration I have: # more ifcfg-eth0 DEVICE=eth0 TYPE=Ethernet BOOTPROTO=none IPADDR=192.168.0.1 NETMASK=255.255.255.0 PREFIX=24 GATEWAY=192.168.0.254 DNS1=192.168.0.199 DNS2=194.204.159.1 DNS3=194.204.152.34 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME=eth0 ONBOOT=yes BRIDGE=br0 MTU=9000 DOMAIN=bursztynowski.waw.pl UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03 # more ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=dhcp #IPADDR=192.168.0.1 #NETMASK=255.255.255.0 #PREFIX=24 #GATEWAY=192.168.0.254 #DNS1=192.168.0.199 #DNS2=194.204.159.1 #DNS3=194.204.152.34 ONBOOT=yes DELAY=0 (previous configuration br0 was: BOOTPRO=static and with no '#' characters. Then all worked excluding NFS. # ifconfig br0 Link encap:Ethernet HWaddr 00:50:8D:94:2F:B7 inet addr:192.168.0.92 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::250:8dff:fe94:2fb7/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1 RX packets:16 errors:0 dropped:0 overruns:0 frame:0 TX packets:26 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:3034 (2.9 KiB) TX bytes:4313 (4.2 KiB) eth0 Link encap:Ethernet HWaddr 00:50:8D:94:2F:B7 inet6 addr: fe80::250:8dff:fe94:2fb7/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:9000 Metric:1 RX packets:57255 errors:0 dropped:0 overruns:0 frame:0 TX packets:60263 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:21481457 (20.4 MiB) TX bytes:15768417 (15.0 MiB) Interrupt:23 Base address:0x8000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:30723 errors:0 dropped:0 overruns:0 frame:0 TX packets:30723 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:92725098 (88.4 MiB) TX bytes:92725098 (88.4 MiB) Should I replace static and dhcp addresses between eth0 and br0 interface? Regards, Radek _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virtTo use bridging on the virtual host you have to assign the IPs to br0 and then add "Bridge=br0" to ifcfg-eth0. I have working examples here, http://itscblog.tamu.edu/startup-guide-for-kvm-on-centos-6/.
Thanks. I used this advice as above. All work excluding my NFS.
Regards, Radek