Re: KVM Bridged Networking Issue in Ubuntu Lucid
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 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
KVM Bridged Networking Issue in Ubuntu Lucid
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 eth0:0Link 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 loLink 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 RefUse Iface 178.63.60.128 0.0.0.0 255.255.255.192 U 0 00 br0 0.0.0.0 178.63.60.129 0.0.0.0 UG10000 br0 this is the routing table on the VM Kernel IP routing table Destination Gateway Genmask
