Thanks for your help, it seems enabling ip forwarding on the host and setting a default gateway on the vm pointing to the host fixed it! On Wed, Aug 25, 2010 at 3:08 AM, haishan <haishan.bai@xxxxxxxxx> wrote: > Rus Hughes wrote: >> >> Hi guys, >> >> I'm trying to sort out networking for a VM I've created on my Ubuntu >> Lucid box but the VM cannot access the Internet. >> I can connect to the VM (crisps) from the host (holly) and to the host >> from the VM. >> But the VM cannot connect to the Internet and the Internet cannot >> connect to the VM. >> >> I followed the guide here: https://help.ubuntu.com/community/KVM >> >> I created it using ubuntu-vm-builder using : >> >> ubuntu-vm-builder kvm lucid \ >> --domain crisps \ >> --dest crisps \ >> --arch amd64 \ >> --hostname crisps \ >> --mem 2048 \ >> --rootsize 4096 \ >> --swapsize 1024 \ >> --user magicalusernameofdoom \ >> --pass somesecretawesomepassword \ >> --ip 178.63.60.159 \ >> --mask 255.255.255.192 \ >> --bcast 178.63.60.191 \ >> --gw 178.63.60.129 \ >> --dns 213.133.99.99 \ >> --mirror http://de.archive.ubuntu.com/ubuntu \ >> --components main,universe,restricted,multiverse \ >> --addpkg openssh-server \ >> --libvirt qemu:///system \ >> --bridge br0; >> >> "virsh start crisps" starts the vm up : >> >> root 29297 0.5 3.3 2280396 271220 ? Sl 14:12 0:13 >> /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 2048 -smp 1 -name crisps >> -uuid e2cda480-29e7-3740-d6c6-816e2f78223e -chardev >> socket,id=monitor,path=/var/lib/libvirt/qemu/crisps.monitor,server,nowait >> -monitor chardev:monitor -boot c -drive >> file=/home/idimmu/vms/crisps/tmplXQBtt.qcow2,if=ide,index=0,boot=on >> -net nic,macaddr=52:54:00:a6:28:b9,vlan=0,model=virtio,name=virtio.0 >> -net tap,fd=41,vlan=0,name=tap.0 -serial none -parallel none -usb -vnc >> 127.0.0.1:0 -vga cirrus >> >> Networking on the host is like so: >> >> br0 Link encap:Ethernet HWaddr 26:5d:c9:d2:75:2e >> inet addr:178.63.60.138 Bcast:178.63.60.191 >> Mask:255.255.255.192 >> inet6 addr: fe80::4261:86ff:fee9:d69a/64 Scope:Link >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> RX packets:49080900 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:54086580 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:0 >> RX bytes:35266886777 (35.2 GB) TX bytes:60292047383 (60.2 GB) >> >> eth0 Link encap:Ethernet HWaddr 40:61:86:e9:d6:9a >> inet6 addr: fe80::4261:86ff:fee9:d69a/64 Scope:Link >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> RX packets:49418744 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:54348661 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:1000 >> RX bytes:36337218359 (36.3 GB) TX bytes:60378047518 (60.3 GB) >> Interrupt:29 Base address:0x4000 >> >> eth0:0 Link encap:Ethernet HWaddr 40:61:86:e9:d6:9a >> inet addr:178.63.60.178 Bcast:178.63.60.191 >> Mask:255.255.255.192 >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> Interrupt:29 Base address:0x4000 >> >> 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:1063249 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:1063249 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:0 >> RX bytes:325111540 (325.1 MB) TX bytes:325111540 (325.1 MB) >> >> vnet0 Link encap:Ethernet HWaddr 26:5d:c9:d2:75:2e >> inet6 addr: fe80::245d:c9ff:fed2:752e/64 Scope:Link >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> RX packets:72 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:33 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:500 >> RX bytes:3412 (3.4 KB) TX bytes:2698 (2.6 KB) >> >> the hosts /etc/network/interfaces is like so : >> >> auto lo >> iface lo inet loopback >> >> # device: eth0 >> auto eth0 >> iface eth0 inet manual >> >> auto br0 >> iface br0 inet static >> address 178.63.60.138 >> broadcast 178.63.60.191 >> netmask 255.255.255.192 >> gateway 178.63.60.129 >> network 178.63.60.128 >> bridge_ports eth0 >> bridge_stp off >> bridge_fd 0 >> bridge_maxwait 0 >> >> # subli.me.uk >> auto eth0:0 >> iface eth0:0 inet static >> address 178.63.60.178 >> netmask 255.255.255.192 >> >> >> If I ping the VM I see the packets on the host br0 but not vnet0, this >> is the output of brctl show on the host : >> >> bridge name bridge id STP enabled interfaces >> br0 8000.265dc9d2752e no eth0 >> >> vnet0 >> this is the routing table on the host >> >> Kernel IP routing table >> Destination Gateway Genmask Flags Metric Ref Use >> Iface >> 178.63.60.128 0.0.0.0 255.255.255.192 U 0 0 0 >> br0 >> 0.0.0.0 178.63.60.129 0.0.0.0 UG 100 0 0 >> br0 >> >> this is the routing table on the VM >> >> Kernel IP routing table >> Destination Gateway Genmask Flags Metric Ref Use >> Iface >> 178.63.60.128 0.0.0.0 255.255.255.192 U 0 0 0 >> eth0 >> 0.0.0.0 178.63.60.129 0.0.0.0 UG 100 0 0 >> eth0 >> >> and the VM's network configuration >> >> eth0 Link encap:Ethernet HWaddr 52:54:00:a6:28:b9 >> inet addr:178.63.60.159 Bcast:178.63.60.191 >> Mask:255.255.255.192 >> inet6 addr: fe80::5054:ff:fea6:28b9/64 Scope:Link >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> RX packets:777 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:319 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:1000 >> RX bytes:968410 (968.4 KB) TX bytes:29662 (29.6 KB) >> >> 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:37 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:37 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:0 >> RX bytes:3412 (3.4 KB) TX bytes:3412 (3.4 KB) >> >> and this is crisps.xml >> >> <domain type='kvm'> >> <name>crisps</name> >> <uuid>e2cda480-29e7-3740-d6c6-816e2f78223e</uuid> >> <memory>2097152</memory> >> <currentMemory>2097152</currentMemory> >> <vcpu>1</vcpu> >> <os> >> <type arch='x86_64' machine='pc-0.12'>hvm</type> >> <boot dev='hd'/> >> </os> >> <features> >> <acpi/> >> </features> >> <clock offset='utc'/> >> <on_poweroff>destroy</on_poweroff> >> <on_reboot>restart</on_reboot> >> <on_crash>destroy</on_crash> >> <devices> >> <emulator>/usr/bin/kvm</emulator> >> <disk type='file' device='disk'> >> <source file='/home/idimmu/vms/crisps/tmplXQBtt.qcow2'/> >> <target dev='hda' bus='ide'/> >> </disk> >> <interface type='bridge'> >> <mac address='52:54:00:a6:28:b9'/> >> <source bridge='br0'/> >> <model type='virtio'/> >> </interface> >> <input type='mouse' bus='ps2'/> >> <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'/> >> <video> >> <model type='cirrus' vram='9216' heads='1'/> >> </video> >> </devices> >> </domain> >> >> im completely out of ideas and any help would be appreciated! >> >> Cheers, >> >> Rus >> -- >> 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 >> > > > 1, create a bridge (br0) > 2, create a tap (tap0) > 3, add eth0 to br0 > 4, add tap0 to br0 > 5, ifconfig eth0 0.0.0.0 > 6, dhclient br0 > 7, set default gateway to br0 > 8, qemu-systam-x86_64 .... -net tap,ifname=tap0,script=no > > If the auto configuration of network failed to work that was maybe your DHCP > server's problem, set the network manually. > > > Regards > Shan Hai > > -- 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
