similar to: How can I set the advertised value of MTU for virbr0 interface?

On 15.10.2015 20:23, George Trakatelis wrote: > Hi all, > > I want to set the advertised value of MTU > for virbr0 interface on a Fedora 21 host to 1454 > to accommodate the installation of new VMs for testing purposes. > The aforementioned host is an OpenStack VM actually, > which explains the need for a lower than 1500 MTU. > > I noticed Pieter Hollants'

Hi, I got this NOTE on most of the link. But I am not getting reason for this. Why someone should not add physical NIC to virbr0. I tried to add my eth1 to virbr0 and it get added. So whether it affects to some functionality of NAT network? -- Sagar Dilip Shedge, Pune. With Regards.

On Tue, Jun 20, 2017 at 10:05:19AM +0200, Martin Kletzander wrote: >On Tue, Jun 20, 2017 at 02:26:59AM -0400, Travis S. Johnson wrote: >>Hello, >> >>I came across an interesting problem in my home lab a few weeks ago as I'm >>prepping for my RHCE exam using Michael Jang study guide. I've been at this >>for days now, and I still can't wrap my head around

On Wed, Mar 9, 2016 at 2:49 PM, Andrea Bolognani <abologna@redhat.com> wrote: > On Wed, 2016-03-09 at 14:15 +0000, Andrei Perietanu wrote: > > I am building a custom Linux image which includes KVM and will be > installed on multiple machines. By default when > > installing libvirt you get a 'default network' which adds a 'vrbr0'. > > I found several

On 08/06/2013 06:38 PM, Jorge Fábregas wrote: > On 07/31/2013 11:01 AM, Jorge Fábregas wrote: >> That is, the first network can reach all other networks (just because it >> happens to be the first one defined). Is this the intention (only >> default can talk to the others but not the other way around)? > *Bump* > > I found this excellent post by Daniel Berrange: >

On Fri, 2016-05-06 at 07:41 -0400, Laine Stump wrote: > On 05/04/2016 08:40 AM, lejeczek wrote: > > > hi users > > > > > > I have my dhcpd to serve nothing but virbr0 (libvirt), OS is Centos > > 7.2 > > Dhcpd would not start, complaining like this: > > >   > Is virbr0 created by libvirt as part of one of its "virtual >

On 08/13/2013 07:07 AM, Jorge Fábregas wrote: > On 08/13/2013 06:31 AM, Laine Stump wrote: >> Correct. That is a known problem since 2008: >> >> https://bugzilla.redhat.com/show_bug.cgi?id=453580 > Thanks Laine for confirming it is a known issue. I googled it a lot but > couldn't find that bugzilla entry. > > Do you know if this is still the case with the

Hello, I came across an interesting problem in my home lab a few weeks ago as I'm prepping for my RHCE exam using Michael Jang study guide. I've been at this for days now, and I still can't wrap my head around how two or more virtual networks in default NAT configuration are even allowed to communicate with each other despite what the libvirt documentation said. Here's the

On 02/14/2012 11:01 AM, Jun Koi wrote: > On Tue, Feb 14, 2012 at 11:47 PM, Alex Jia <ajia at redhat.com> wrote: >> Hi Jun, >> I assume you haven't changed libvirt default URI, it may be a issue, >> I want to know whether it works for you if you explicitly specify >> --connect qemu:///system with virt-install? I think a root reason >> probably is your disk

On 12/16/2013 04:47 AM, Gao feng wrote: > On 12/14/2013 10:51 AM, scar wrote: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA256 >> >> Gao feng @ 12/12/2013 10:18 PM: >>> I saw there are two bridge br0 and virbr0 in your host. which >>> bridge the libvirt uses? what's result of #virsh net-list ? >> well i don't quite understand bridges

hi users I have my dhcpd to serve nothing but virbr0 (libvirt), OS is Centos 7.2 Dhcpd would not start, complaining like this: No subnet declaration for virbr0 (no IPv4 addresses). ** Ignoring requests on virbr0.  If this is not what    you want, please write a subnet declaration    in your dhcpd.conf file for the network segment    to which interface virbr0 is attached. ** ##SELECTION_END## and

Thanks for the reply Laine. My problem is that dnsmasq is masking dhcpd, xCAT uses dhcpd for PXE stuff. If dnsmasq answer DHCP requests the PXE boot won' t work. I want to see the logs for ensuring the dnsmasq is not masking dhcpd. Regards, 2018-06-18 11:39 GMT-03:00 Laine Stump <laine@redhat.com>: > On 06/18/2018 09:16 AM, Daniel. wrote: >> Cool, thanks!! Does it have logs?

I need some help in understanding libvirt's virtual networking. I have configured bridged networking (shared physical device) on libvirt+KVM system which is working fine. Also, I am using default NAT network on with virbr0 bridge device and virbr0-nic. I would like to get better understanding on virbr0-nic works in this virtual network configuration. I understand that traffic from virbr0

HI Michal Thank you for explaining. I have this situation in a number of production servers where we would always use static IPs for the host and VMs. In such case we have no requirement for NATed network in the future. And we we ever do, we can rely on a DHCP server within the LAN to provide IPs to the VMs. I'll look to remove both libivirt-daemon-driver-network,

I need to use an existing windows 7 installation in a virtual machine form a libvirt host running Ubuntu 12.10. Windows 7 installs on two partitions. There a 100MB boot partitiona and then the main partition for the installation. If I boot the laptop (which dual boots), I can select Windows 7 and boot it just fine, or alternative Ubuntu. If I select /dev/sda1 in the virtmanager as the source

Hi , I have two virtual machines VM1 and VM2. Then I have added eth0 of my VM to 'default' network. Use case :- I want to monitor all traffic on virbr0('default' network). Steps followed :- 1. Add VM1 eth0 to virbr0 2. Add VM2 eth1 to virbr0 3. brctl setageing ovsbr0 0 ..(To put bridge in promiscuous) Now I am running tcpdump on eth1 of VM2 and trying to ping

hi everybody my mind must have gone blank & eyes blind, I'm hoping it's simple and somebody can shed the light on bit I cannot see. a regular default net: <network> <name>default</name> <uuid>4c0a0c44-7e8a-493b-a57c-87cd38eaa0f7</uuid> <forward mode='nat'/> <bridge name='virbr0' stp='on'

Hi everyone. Those are the iptables forwarding rules associated with the two virtual networks on my machine: ----------------------------------------------------------------------------------------- -A FORWARD -d 192.168.100.0/24 -o virbr1 -m state --state RELATED,ESTABLISHED -j ACCEPT -A FORWARD -s 192.168.100.0/24 -i virbr1 -j ACCEPT -A FORWARD -i virbr1 -o virbr1 -j ACCEPT -A FORWARD -o

On Wed, Oct 10, 2018 at 10:18 AM Pino Toscano <ptoscano@redhat.com> wrote: > On Tuesday, 9 October 2018 20:16:04 CEST Nir Soffer wrote: > > I'm trying to build fedora-27 image for testing uploads: > > > > $ virt-builder fedora-27 -o /var/tmp/fedora-27.img > > ... > > [ 25.2] Opening the new disk > > virt-builder: error: libguestfs error: bridge

Interested in bonding my 2 on board nics along with my add on card NIC for a total of 3. How would this work with the virtual machines? My eths/IPs ---> bond0, bond0:1, etc ---> ? ----> virbr0,virbr0:1 (each machine to have own IP address, one machine may have some virtual sites needing more than one ip, so multiple ips added to mix..) add something to the bond0 file, or just leave