Tagged Questions

1
vote
1answer
91 views

kvm guest Network interface no Authenication

i have a kvm host based on ubuntu 10.04 host , and the guest is rhel 5.3 64-bit, on the guest i tried to execute mii-tool eth0 SIOCGMIIREG on eth0 failed: Input/output error SIOCGMIIREG on eth0 ...
1
vote
0answers
174 views

Ubuntu 10.04 kvm Virtual Machine guest network speed slow

i have the following situation, i have a kvm host ubuntu 10.04 LTS 64-bit network host speed is perfectly run , as i am testing network speed using iperf , the speed between any network device and the ...
3
votes
1answer
587 views

qemu - two clients (tap0 & tap1) via br0 can't ping eachother but server pings ok

I've got: A host system running Ubuntu with KVM (functional) Two clients, one Ubuntu and one Windows 7, nothing fancy. I've also setup (see below) a bridge via br0 for the clients: br0: ...
1
vote
1answer
1k views

What is the difference between virbr# and vnet#?

I am running KVM on RHEL6, and I have created several virtual machines in it. Issuing ifconfig command to the host system command line shows a list of virbr0, virbr1... and vnet0, vnet2... Are they ...
1
vote
2answers
677 views

Why doesn't eth0 get an ip address when set up in a bridge?

I'm trying to understand how dhcp for IPv4 is used with bridging. eth0 is configured to be in br0. This is working just fine but only br0 gets a dhcp lease, while eth0 doesn't. Both are configured ...
1
vote
1answer
132 views

How to get the cloned guest connected to the Internet?

I made a clone of a VM(running a version of Centos 6) on KVM, but the clone wouldn't connect to the Internet. Issuing ifconfig shows no interfaces but the lo. Interestingly, the original system can ...
1
vote
0answers
307 views

KVM network bridge and public static IP for both host and guests [closed]

I have a Debian Server with 4 public static addresses. There is a KVM guest (also Debian) installed and running. What I want is to give the guest an IP of the host, so that both machines have public ...
1
vote
1answer
915 views

Bridging ethernet interface

I have a server with 4 public IP's. I have it with this configuration and I want to bridge the interface eth0 for using it with KVM: So, I have 3 IP's (A.B.C.144, A.B.C.145, A.B.C.146) and another ...
3
votes
2answers
703 views

How to know if a process is attached to a tap interface?

I sometimes come upon machine with tap interfaces (eg, when KVM is running). How can i know which process is attached to the tap interface ?
2
votes
2answers
593 views

Poor network performance from KVM virtual machine

I am running a 32-bit Linux virtual machine on KVM. The host machine is a 64-bit Linux machine connected to a LAN. Attempting to transfer files with scp from the KVM machine to a server on the LAN ...
7
votes
4answers
5k views

How to find the IP address of a KVM Virtual Machine, that I can SSH into it?

I have follow this guide (Virtualization With KVM On Ubuntu 11.10) to setup my KVM (Virtual Machines Software) on my Ubuntu 11.10 Server. However, I didn't setup my VM's IP address when creating the ...
3
votes
1answer
324 views

What happens if you add a vlan-device to an interface that already is a vlan device?

When configuring an application that creates vlans by using vconfig add, I discovered that it was adding a vlan device to something that was already a vlan device. Effectively, what happened was: # ...
2
votes
1answer
177 views

KVM: network partially lost for the host, guests are fine

I got KVM working fine on a Linux system, for quite some weeks. Then today something weird happened: suddenly the host (and the host only) lost some of its Internet access: it can still access the ...
3
votes
1answer
190 views

Which user group can use the 'tap' net device?

I use the 'tap' net device with KVM to get my vm connect to the Internet. But I have to be root, or use 'sudo', which is inconvenient. I think I can put my user account into some group so I can access ...
4
votes
2answers
3k views

bridged networking with kvm

I'm trying to get a guest virtual machine connected to my network using bridging. I've come across a couple of resources online, but they seem to be out of date, deal with xen or Ubuntu or don't seem ...
2
votes
1answer
1k views

How to connect a KVM guest to the internet with wireless

Because my wireless network adapter does not support bridging, it is really difficult to get the guest VM to connect to the open internet and have an IP address in the same network as the host. I am ...