# NetworkManager 

Let's put here some snippets that can be used to eventually modify some configurations on already installed CentOS Linux boxes

## Bridge with ip address

```

bridge_name="br0"

bridge_dev="enp2s0f0"

ip="192.168.1.10/24"

gw="192.168.1.254"

dns="192.168.1.1,192.168.1.2"

nmcli con add con-name ${bridge_name} type bridge ifname ${bridge_name}

nmcli con mod ${bridge_name} ipv4.method manual ipv4.addr ${ip} ipv4.dns ${dns} ipv4.gateway ${gw} bridge.stp no

nmcli con del ${bridge_dev} ; nmcli con add con-name ${bridge_dev} type bridge-slave ifname ${bridge_dev} master ${bridge_name} ; nmcli con up ${bridge_dev} ; nmcli con up ${bridge_name} ; echo "sleeping" ; sleep 60 ; systemctl reboot

```

## Bridge without IP address (virt hypervisor on another dedicated nic)

```

bridge_name="br_203"

bridge_dev="eth1"

nmcli con add con-name ${bridge_name} type bridge ifname ${bridge_name}

nmcli con mod ${bridge_name} ipv6.method ignore ipv4.method disabled

nmcli con del ${bridge_dev} ; nmcli con add con-name ${bridge_dev} type bridge-slave ifname ${bridge_dev} master ${bridge_name} ; nmcli con up ${bridge_dev} ; nmcli con up ${bridge_name}

```

## VLAN interface 802.1q

```

eth_dev="eth0"

vlan_id="203"

ip="172.19.0.17/23"

gw=""

dns="172.22.0.1,172.22.0.2"

nmcli con add con-name ${eth_dev}.${vlan_id} type vlan dev ${eth_dev} id ${vlan_id} ipv4.method manual ipv4.address ${ip}

```

## Bridge + VLAN tagging

```

eth_dev="enP5p5s0f3"

vlan_id="203"

nmcli con add type bridge ifname br_${vlan_id} ipv4.method disabled ipv6.method ignore bridge.stp no

nmcli connection add type vlan ifname ${eth_dev}.${vlan_id} dev ${eth_dev} id ${vlan_id} master br_${vlan_id} slave-type bridge

```