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read https://wiki.libvirt.org/page/VirtualNetworking along with below data
The above deostn't talk about bridged networking.
For bridged networking https://wiki.libvirt.org/page/Networking
[stack@gprfs036 infrared]$ brctl show
bridge name bridge id STP enabled interfaces
data 8000.525400520d57 yes data-nic
vnet0
vnet3
vnet6
external 8000.5254007596f0 yes external-nic
vnet2
vnet5
vnet8
management 8000.52540017a0b2 yes management-nic
vnet1
vnet4
vnet7
virbr0 8000.525400e24bbe yes virbr0-nic
[stack@gprfs036 infrared]$ iptables -t nat -L | grep -i masq
iptables v1.4.21: can't initialize iptables table `nat': Permission denied (you must be root)
Perhaps iptables or your kernel needs to be upgraded.
[stack@gprfs036 infrared]$ sudo iptables -t nat -L | grep -i masq
MASQUERADE tcp -- 172.16.0.0/24 !172.16.0.0/24 masq ports: 1024-65535
MASQUERADE udp -- 172.16.0.0/24 !172.16.0.0/24 masq ports: 1024-65535
MASQUERADE all -- 172.16.0.0/24 !172.16.0.0/24
MASQUERADE tcp -- 10.0.0.0/24 !10.0.0.0/24 masq ports: 1024-65535
MASQUERADE udp -- 10.0.0.0/24 !10.0.0.0/24 masq ports: 1024-65535
MASQUERADE all -- 10.0.0.0/24 !10.0.0.0/24
MASQUERADE tcp -- 192.168.122.0/24 !192.168.122.0/24 masq ports: 1024-65535
MASQUERADE udp -- 192.168.122.0/24 !192.168.122.0/24 masq ports: 1024-65535
MASQUERADE all -- 192.168.122.0/24 !192.168.122.0/24
[stack@gprfs036 infrared]$ ip r
default via 10.16.159.254 dev em1 proto dhcp metric 100
10.0.0.0/24 dev external proto kernel scope link src 10.0.0.1
10.16.152.0/21 dev em1 proto kernel scope link src 10.16.153.105 metric 100
172.16.0.0/24 dev management proto kernel scope link src 172.16.0.1
192.168.24.0/24 dev data proto kernel scope link src 192.168.24.254
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
[stack@gprfs036 infrared]$ ps -aef | grep dnsma
nobody 2976 1 0 Jun03 ? 00:00:06 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
root 2977 2976 0 Jun03 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
nobody 6763 1 0 Jun03 ? 00:00:12 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/external.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
root 6764 6763 0 Jun03 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/external.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
nobody 6947 1 0 Jun03 ? 00:00:08 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/management.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
root 6950 6947 0 Jun03 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/management.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
nobody 7112 1 0 Jun03 ? 00:00:06 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/data.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
For routed networking
https://jamielinux.com/docs/libvirt-networking-handbook/routed-network.html
gprfc43
-------
ip r
172.15.1.0/24 dev br-management
172.15.0.0/16 dev p4p1
ip a
br-management 172.15.1.1/24
p4p1 172.15.0.1/16
DHCP for br-management network 172.15.1.2-172.15.1.255
gprfc44
-------
ip r
172.15.2.0/24 dev br-management
172.15.0.0/16 dev p4p1
ip a
br-management 172.15.2.1/24
p4p1 172.15.0.2/16
DHCP for br-management network 172.15.2.2-172.15.2.255
sudo yum install git gcc libffi-devel openssl-devel python-virtualenv libselinux-python tmux qemu-kvm libvirt libvirt-python libguestfs-tools virt-install libguestfs libguestfs-tools-c libguestfs-tools-xfs python-lxml wget libselinux-python expect -y;systemctl enable libvirtd;systemctl start libvirtd
ip a a 172.15.0.2/16 dev p2p1
cat /tmp/mynetwork1.xml
<network>
<name>mynetwork1</name>
<bridge name="virbr1" />
<forward mode="route"/>
<ip address="172.15.2.1" netmask="255.255.255.0">
<dhcp>
<range start="172.15.2.2" end="172.15.2.254"/>
</dhcp>
</ip>
</network>
virsh net-define /tmp/mynetwork1.xml
virsh net-start mynetwork1
cp /var/lib/libvirt/images/rhel-guest-image-7-6-210-x86-64-qcow2 /var/lib/libvirt/images/test-1-disk1.qcow2
virt-install --name test-1 --disk path=/var/lib/libvirt/images/test-1-disk1.qcow2,device=disk,bus=virtio,format=qcow2,cache=unsafe --boot hd --network network:mynetwork1 --virt-type kvm --cpu host-passthrough --ram 6144 --vcpus 4 --os-variant rhel7 --import --noautoconsole --autostart --vnc --rng /dev/urandom
virsh set-user-password --domain test-1 --user root --password 100yard-
virsh net-dhcp-leases mynetwork1
19 brctl addbr br-virbr19
20 ip a
21 brctl addifbr-virbr19 p2p1
22 brctl addif br-virbr19 p2p1
31 mkdir -p /var/lib/dnsmasq/bridge1
32 touch /var/lib/dnsmasq/bridge1/hostsfile
33 touch /var/lib/dnsmasq/bridge1/leases
34 touch /var/lib/dnsmasq/bridge1/dnsmasq.conf
35 vi /var/lib/dnsmasq/bridge1/dnsmasq.conf
36 cat /var/lib/dnsmasq/bridge1/hostsfile
37 ls /var/lib/dnsmasq/bridge1/hostsfile
38 ip a a 172.15.0.2/16 dev br-virbr19
39 libvirtd --help
40 dnsmasq --conf-file=/var/lib/dnsmasq/bridge1/dnsmasq.conf --pid-file=/var/run/dnsmasq/bridge1.pid
41 vi /var/lib/dnsmasq/bridge1/dnsmasq.conf
42 dnsmasq --conf-file=/var/lib/dnsmasq/bridge1/dnsmasq.conf --pid-file=/var/run/dnsmasq/bridge1.pid
43 vi /var/lib/dnsmasq/bridge1/dnsmasq.conf
44 dnsmasq --conf-file=/var/lib/dnsmasq/bridge1/dnsmasq.conf --pid-file=/var/run/dnsmasq/bridge1.pid
45 dnsmasq --conf-file=/var/lib/dnsmasq/bridge1/dnsmasq.conf
46 ps -aef | grep dnsma
47 ls /var/lib/libvirt/images/
48 virt-install --name test-1 --disk path=/var/lib/libvirt/images/test-1-disk1.qcow2,device=disk,bus=virtio,format=qcow2,cache=unsafe --boot hd --network network:bridge1 --virt-type kvm --cpu host-passthrough --ram 6144 --vcpus 4 --os-variant rhel7 --import --noautoconsole --autostart --vnc --rng /dev/urandom
49 virsh net-dhcp-leases bridge1
50 ls /var/lib/dnsmasq/bridge1/
51 cat /var/lib/dnsmasq/bridge1/hostsfile
52 brctl show
53 ip a
54 virsh list
55 ifconfig
56 ip l s br-virbr19 up
57 ip a
58 virsh destroy test-1
59 virsh undefine test-1
60 brctl show
61 virt-install --name test-1 --disk path=/var/lib/libvirt/images/test-1-disk1.qcow2,device=disk,bus=virtio,format=qcow2,cache=unsafe --boot hd --network network:bridge1 --virt-type kvm --cpu host-passthrough --ram 6144 --vcpus 4 --os-variant rhel7 --import --noautoconsole --autostart --vnc --rng /dev/urandom
62 ls
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