Am 04.04.2010 20:02, schrieb Dan Johansson: > On Sunday 04 April 2010 15.00:26 sudhir kumar wrote: >> On Sun, Apr 4, 2010 at 5:47 PM, Dan Johansson <kvm@xxxxxx> wrote: >>> Hi, >>> >>> I am new to this list and to KVM (and qemu) so please be gentle with me. >>> Up until now I have been running my virtualizing using VMWare-Server. >>> Now I want to try KVM due to some issues with the VMWare-Server and I am >>> having some troubles with the networking part of KVM. >>> >>> This is a small example of what I want (best viewed in a fix-font): >>> >>> +-----------------------------------+ >>> | Host | >>> | +----------+ eth0 |---- 192.168.1.0/24 >>> | | eth0|-- + | >>> | | VM1 eth1|---(---+------- eth1 |---- 192.168.2.0/24 >>> | | eth2|---(---(---+ | >>> | +----------+ | | | | >>> | | | | | >>> | +----------+ +---(---(--- eth2 |---- 192.168.1.0/24 >>> | | eth0|---+ | | | >>> | | VM2 eth1|-------+ +--- eth3 |---- 192.168.3.0/24 >>> | | eth2|-----------+ | >>> | +----------+ | >>> | | >>> +-----------------------------------+ >>> >>> Host-eth0 is only for the Host (no VM) >>> Host-eth1 is shared between the Host and the VM's (VM?-eth1) >>> Host-eth2 and Host-eth3 are only for the VMs (eth0 and eth2) >>> >>> The Host and the VMs all have fixed IPs (no dhcp or likewise). >>> In this example th IPs could be: >>> Host-eth0: 192.168.1.1 >>> Host-eth1: 192.168.2.1 >>> Host-eth2: - >>> Host-eth3: - >>> VM1-eth0: 192.168.1.11 >>> VM1-eth1: 192.168.2.11 >>> VM1-eth2: 192.168.3.11 >>> VM2-eth0: 192.168.1.22 >>> VM2-eth1: 192.168.2.22 >>> VM3-eth2: 192.168.3.22 >>> >>> And, yes, Host-eth0 and Host-eth2 are in the same subnet, with eth0 >>> dedicated to the Host and eth2 dedicated to the VMs. >>> >>> In VMWare this was quite easy to setup (three bridged networks). >> >> Its easy with KVM too. You want 3 NICs per VM, so you need to pass the >> corresponding parameters(including qemu-ifup script) for 3 NICs to >> each VM. >> In the host you need to create 2 bridges: say br-eth1 and br-eth2. >> Make them as the interface on the host in place of the corresponding >> eth interfaces.(brct addbr br-eth1; ifcfg eth1 0.0.0.0 up; brctl addif >> br-eth eth1; assign eth1's ip and routes to breth1; same for eth2). >> In the corresponding qemu-ifup scripts of each interface use >> bridge=br-ethN (This basicaly translates to brctl addif br-ethN $1, >> where $ is the tap device created) >> This should work perfectly fine with your existing NW setup. >> For a quick reference use: http://www.linux-kvm.org/page/Networking > > Thanks for your help, but... I am still not able to get it to work the way I > want. > This is what I have don so far: > brctl addbr br-eth1 > brctl addbr br-eth3 > > ip link set eth1 up > ip link set eth3 up > > brctl addif br-eth1 eth1 > brctl addif br-eth3 eth3 > > tunctl -b -t qtap1 > tunctl -b -t qtap3 > > brctl addif br-eth1 qtap1 > brctl addif br-eth3 qtap3 > > ifconfig qtap1 up 0.0.0.0 promisc > ifconfig qtap3 up 0.0.0.0 promisc > > # ifconfig > eth0 Link encap:Ethernet HWaddr 00:0d:88:52:51:24 > inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0 > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:443638 errors:0 dropped:0 overruns:0 frame:0 > TX packets:758540 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:47041686 (44.8 MiB) TX bytes:990115354 (944.2 MiB) > Interrupt:19 Base address:0xec00 > > eth1 Link encap:Ethernet HWaddr 00:0d:88:52:51:25 > inet addr:192.168.4.1 Bcast:192.168.4.255 Mask:255.255.255.0 > UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:6 errors:0 dropped:0 overruns:0 carrier:6 > collisions:0 txqueuelen:1000 > RX bytes:0 (0.0 B) TX bytes:360 (360.0 B) > Interrupt:18 Base address:0xe880 > > eth3 Link encap:Ethernet HWaddr 00:0d:88:52:51:27 > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:4 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:0 (0.0 B) TX bytes:240 (240.0 B) > Interrupt:16 Base address:0xe480 > > qtap1 Link encap:Ethernet HWaddr 26:c0:de:df:c5:e4 > UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 > RX packets:351 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:500 > RX bytes:14742 (14.3 KiB) TX bytes:0 (0.0 B) > > qtap3 Link encap:Ethernet HWaddr 26:3e:ba:2d:97:bc > UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 > RX packets:6 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:500 > RX bytes:252 (252.0 B) TX bytes:0 (0.0 B) > > > # brctl show > bridge name bridge id STP enabled interfaces > br-eth1 8000.000d88525125 no eth1 > qtap1 > br-eth3 8000.000d88525127 no eth3 > qtap3 > > > This is the way I start the guest: > kvm -net nic,vlan=1,model=rtl8139,macaddr=52:54:00:12:34:56 -net > tap,vlan=1,ifname=qtap1,script=no,downscript=no -net > nic,vlan=3,model=rtl8139,macaddr=52:54:00:12:34:58 -net > tap,vlan=3,ifname=qtap3,script=no,downscript=no Robbie.img -m 1024 > > > The eth3/br-eth3/qtap3 looks OK (I can ping the "default-GW" on that network > from the guest) but the connection to the "shared" interface (eth1/br- > eth1/qtap1) does not work, I can not ping or ssh to/from the guest from/to the > host. Do not ask me if I can ping any other host on that network - there are > no other host on the network yet, just the Host and the guest. > > Any suggestions? eth1 should not have an IP address: # ifconfig eth1 0.0.0.0 br-eth1 is not activated (it's missing in `ifconfig`), and it needs an IP address: # ifconfig br-eth1 192.168.2.1/24 Even if it works I would explicitly activate br-eth3 too: # ifconfig br-eth3 0.0.0.0 up Looking at the output of `ifconfig` shows that the IP-address of eth0 (192.168.1.3) doesn't match 192.168.1.1 from your address list, and eth1 (192.168.4.1) is in a different network than the specified 192.168.2.1/24. HTH, Bernhard -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
