Re: KVM bridge networking

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On Mon, Jul 22, 2019 at 1:27 PM Kaushal Shriyan
<kaushalshriyan@xxxxxxxxx> wrote:
>
> Hi,
>
> I am confused regarding KVM networking. I have configured base OS and guest OS.
>
> [root@baremetalinhousebaseserver1 network-scripts]# cat ifcfg-br0
> TYPE=bridge
> PROXY_METHOD=none
> BROWSER_ONLY=no
> BOOTPROTO=static
> DEFROUTE=yes
> IPV4_FAILURE_FATAL=no
> #IPV6INIT=yes
> #IPV6_AUTOCONF=yes
> #IPV6_DEFROUTE=yes
> #IPV6_FAILURE_FATAL=no
> #IPV6_ADDR_GEN_MODE=stable-privacy
> NAME=br0
> #UUID=af60e6bd-e824-44fa-a816-763e6e977ae6
> DEVICE=br0
> ONBOOT=yes
> IPADDR=192.168.0.65
> PREFIX=24
> GATEWAY=192.168.0.10
> DNS1=213.117.155.12
> DNS2=213.117.155.10
> [root@baremetainhousebaseserver1 network-scripts]# cat ifcfg-em1
> TYPE=Ethernet
> PROXY_METHOD=none
> BROWSER_ONLY=no
> BOOTPROTO=static
> DEFROUTE=yes
> IPV4_FAILURE_FATAL=no
> IPV6INIT=yes
> IPV6_AUTOCONF=yes
> IPV6_DEFROUTE=yes
> IPV6_FAILURE_FATAL=no
> IPV6_ADDR_GEN_MODE=stable-privacy
> NAME=em1
> UUID=af60e6bd-e824-44fa-a816-763e6e977ae6
> DEVICE=em1
> ONBOOT=yes
> BRIDGE=br0
> IPADDR=192.168.0.35
> PREFIX=24
> GATEWAY=192.168.0.10
> DNS1=213.117.155.12
> DNS2=213.117.155.10
> [root@baremetainhousebaseserver1 network-scripts]#
>
> I use the below command to launch KVM guest VM
>
> #virt-install --name=qubecrafter02
> --file=/var/lib/libvirt/images/apprafter02centos7.img --file-size=50
> --nonsparse --vcpus=2 --ram=8096 --network=bridge:br0 --os-type=linux
> --os-variant=rhel7 --graphics none
> --location=/var/lib/libvirt/isos/CentOS-7-x86_64-DVD-1810.iso
> --extra-args="console=ttyS0"
>
> I do vim /etc/sysconfig/network-scripts/ifcfg-eth0 on guestosvm1
>
> [root@guestosvm1 network-scripts]# cat ifcfg-eth0
> TYPE=Ethernet
> PROXY_METHOD=none
> BROWSER_ONLY=no
> BOOTPROTO=static
> DEFROUTE=yes
> IPV4_FAILURE_FATAL=no
> IPV6INIT=yes
> IPV6_AUTOCONF=yes
> IPV6_DEFROUTE=yes
> IPV6_FAILURE_FATAL=no
> IPV6_ADDR_GEN_MODE=stable-privacy
> NAME=eth0
> UUID=805ff146-ecc1-460a-a7e2-e35eb19814c2
> DEVICE=eth0
> ONBOOT=yes
> IPADDR=192.168.0.66
> PREFIX=24
> GATEWAY=192.168.0.10
> DNS1=213.117.155.12
> DNS2=213.117.155.10
> [root@guestosvm1 network-scripts]#
>
> I am confused between bridge and ethernet networking. Am i missing
> anything in the above configurations, Please comment.
>
> Thanks in Advance and i look forward to hearing from you.
>
> Best Regards,
>
> Kaushal

Did you test if bridge was up before adding the vm guest? Why does em1
have an ip?



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