[libvirt-users] Broken br0
Hello, I wanted to get an extra IP on my local NIC, so I ran `sudo ip addr add 192.168.1.130/24 dev enp4s0`. This didn't work as intended, so I thought I'd restart the Ubuntu system to have things back to how they were. Alas, this didn't happen. While the host still has network as usual, none of the VMs are able to get a DHCP lease from the router, or any connectivity at all. I can still see br0 with `ip addr`, but my guess is that it's misconfigured now. I tried adding a br1 with virt-manager (Edit > Connection details > Network interfaces > Add interface) and using that instead, but the app crashed halfway through; and I can't disable or remove the connection with the app now. I wonder if this isn't a routing issue, but I am not very proficient in that area to troubleshoot and fix. Where should I start? I'd like to use this as an opportunity to learn more about networking and VMs, so bear with me if I ask stupid/basic questions. Thanks!
Hi I usually configure networks through /etc/network/interfaces especially ones that virtual machines need. Cheers 2017-07-03 14:44 GMT+02:00 <virt.persik@9ox.net>:
Hello,
I wanted to get an extra IP on my local NIC, so I ran `sudo ip addr add 192.168.1.130/24 dev enp4s0`. This didn't work as intended, so I thought I'd restart the Ubuntu system to have things back to how they were.
Alas, this didn't happen. While the host still has network as usual, none of the VMs are able to get a DHCP lease from the router, or any connectivity at all.
I can still see br0 with `ip addr`, but my guess is that it's misconfigured now.
I tried adding a br1 with virt-manager (Edit > Connection details > Network interfaces > Add interface) and using that instead, but the app crashed halfway through; and I can't disable or remove the connection with the app now.
I wonder if this isn't a routing issue, but I am not very proficient in that area to troubleshoot and fix.
Where should I start? I'd like to use this as an opportunity to learn more about networking and VMs, so bear with me if I ask stupid/basic questions. Thanks!
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-- Dominik Psenner
On Mon, Jul 03, 2017 at 08:44:00AM -0400, virt.persik@9ox.net wrote:
Hello,
I wanted to get an extra IP on my local NIC, so I ran `sudo ip addr add 192.168.1.130/24 dev enp4s0`. This didn't work as intended, so I thought
Well, this information does not have any value without us knowing what is your setup.
I'd restart the Ubuntu system to have things back to how they were.
Alas, this didn't happen. While the host still has network as usual, none of the VMs are able to get a DHCP lease from the router, or any connectivity at all.
Still, no information about the setup (Outputs of `ip l`, `ip a`, `brctl show`, etc.)
I can still see br0 with `ip addr`, but my guess is that it's misconfigured now.
Define 'misconfigured' here.
I tried adding a br1 with virt-manager (Edit > Connection details > Network interfaces > Add interface) and using that instead, but the app crashed halfway through; and I can't disable or remove the connection with the app now.
What is the relevant information here? Did it change any system settings? Do you want to report the crash? How did it happen? Can you do that without the app? And so on...
I wonder if this isn't a routing issue, but I am not very proficient in that area to troubleshoot and fix.
I don't see what this would have in common with routing, but since there is no information to start from, I can't even say that it's not related.
Where should I start? I'd like to use this as an opportunity to learn more about networking and VMs, so bear with me if I ask stupid/basic questions. Thanks!
No problem, but try giving more information. What I got from your mail was not much more than "My VMs don't have network access.", so maybe try adding some information hinted at above, check what libvirt networks you have and which are running (virsh net-list --all), send some configuration information for those networks (virsh net-dumpxml $network_name) and check libvirt logs (might vary depending on your platform and such).
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