# Question about Bridged Networks **URL:** \ **Category:** Product Support\ **Created:** [May 11, 2021, 7:27pm UTC](https://forum.opennebula.io/t/question-about-bridged-networks/9519 "2021-05-11T19:27:31Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![alessandro.caetano](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@alessandro.caetano](https://forum.opennebula.io/u/alessandro.caetano)\ **Post date:** [May 11, 2021, 7:27pm UTC](https://forum.opennebula.io/t/question-about-bridged-networks/9519/1 "2021-05-11T19:27:31Z")
Hello, I have a cluster with two nodes, one master node containing all OpenNebula services that’s also configured as a KVM node, and another machine containing only the KVM services. I’m in doubt when configuring the network services for both nodes. In the **Master** node I have two network interfaces, In one of them a set-up a bridge called nebula0 as show here: ```auto 1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eno1: mtu 1500 qdisc mq master nebula0 state UP group default qlen 1000 link/ether f4:8e:38:e0:41:79 brd ff:ff:ff:ff:ff:ff 3: eno2: mtu 1500 qdisc mq state UP group default qlen 1000 link/ether f4:8e:38:e0:41:7a brd ff:ff:ff:ff:ff:ff inet 10.2.250.14/24 brd 10.2.250.255 scope global noprefixroute eno2 valid_lft forever preferred_lft forever inet6 fe80::f68e:38ff:fee0:417a/64 scope link valid_lft forever preferred_lft forever 4: nebula0: mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether f4:8e:38:e0:41:79 brd ff:ff:ff:ff:ff:ff inet 10.2.250.13/24 brd 10.2.250.255 scope global noprefixroute nebula0 valid_lft forever preferred_lft forever inet6 fe80::f68e:38ff:fee0:4179/64 scope link valid_lft forever preferred_lft forever 5: virbr0: mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 52:54:00:d0:cf:c6 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever ``` In the other node, called **NODE1** , I didn’t make any network configuration so its interfaces are: ```auto 1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eno1: mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether 84:7b:eb:e4:f4:32 brd ff:ff:ff:ff:ff:ff inet 10.2.250.22/24 brd 10.2.250.255 scope global dynamic eno1 valid_lft 69466sec preferred_lft 69466sec inet6 fe80::867b:ebff:fee4:f432/64 scope link valid_lft forever preferred_lft forever 3: virbr0: mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 52:54:00:0a:81:63 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever 4: virbr0-nic: mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000 link/ether 52:54:00:0a:81:63 brd ff:ff:ff:ff:ff:ff ``` I’ve created one VNET using Sunstone, that is configured as follows? ```auto root@NEBULACLUSTER-MASTER-MACAE-ED-COMPANY:/etc/netplan# onevnet list ID USER GROUP NAME CLUSTERS BRIDGE LEASES 9 alessand oneadmin Private VNET 100 nebula0 2 root@NEBULACLUSTER-MASTER-MACAE-ED-COMPANY:/etc/netplan# onevnet show 9 VIRTUAL NETWORK 9 INFORMATION ID : 9 NAME : Private VNET USER : alessandro.caetano GROUP : oneadmin LOCK : None CLUSTERS : 100 BRIDGE : nebula0 VN_MAD : bridge PHYSICAL DEVICE : eno1 AUTOMATIC VLAN ID : NO AUTOMATIC OUTER VLAN ID : NO USED LEASES : 2 PERMISSIONS OWNER : um- GROUP : --- OTHER : --- VIRTUAL NETWORK TEMPLATE BRIDGE="nebula0" BRIDGE_TYPE="linux" DNS="10.2.250.1" GATEWAY="10.2.250.1" GUEST_MTU="1500" NETWORK_ADDRESS="10.2.250.13" NETWORK_MASK="255.255.255.0" PHYDEV="eno1" SECURITY_GROUPS="0" VN_MAD="bridge" ADDRESS RANGE POOL AR 0 SIZE : 100 LEASES : 2 RANGE FIRST LAST MAC 02:00:0a:02:fa:64 02:00:0a:02:fa:c7 IP 10.2.250.100 10.2.250.199 LEASES AR OWNER MAC IP IP6 0 V:38 02:00:0a:02:fa:64 10.2.250.100 - 0 V:39 02:00:0a:02:fa:65 10.2.250.101 - VIRTUAL ROUTERS ``` Whenever I create a VM in the Master node, the VM has internet connectivity, however, when the VM is in the Node1, it doesn’t. Do I need to create the same bridge in all the nodes that I add to the OpenNebula cluster, if so what’s the point of selecting a bridged network instead of a dummy VM\_MAD? * * * **Versions of the related components and OS (frontend, hypervisors, VMs):** _ **OpenNebula** _ ```auto ii opennebula 6.0.0.1-1.ce amd64 OpenNebula Server and Scheduler (Community Edition) ii opennebula-common 6.0.0.1-1.ce all Common OpenNebula package shared by various components (Community Edition) ii opennebula-common-onecfg 6.0.0.1-1.ce all Helpers for OpenNebula onecfg (Community Edition) ii opennebula-fireedge 6.0.0.1-1.ce amd64 OpenNebula web interface FireEdge (Community Edition) ii opennebula-flow 6.0.0.1-1.ce all OpenNebula Flow server (Community Edition) ii opennebula-gate 6.0.0.1-1.ce all OpenNebula Gate server (Community Edition) ii opennebula-guacd 6.0.0.1-1.ce amd64 Provides Guacamole server for Fireedge to be used in Sunstone (Community Edition) ii opennebula-libs 6.0.0.1-1.ce all OpenNebula libraries (Community Edition) ii opennebula-node-kvm 6.0.0.1-1.ce all Services for OpenNebula KVM node (Community Edition) ii opennebula-provision 6.0.0.1-1.ce all OpenNebula infrastructure provisioning (Community Edition) ii opennebula-provision-data 6.0.0.1-1.ce all OpenNebula infrastructure provisioning data (Community Edition) ii opennebula-rubygems 6.0.0.1-1.ce all Ruby dependencies for OpenNebula (Community Edition) ii opennebula-sunstone 6.0.0.1-1.ce all OpenNebula web interface Sunstone (Community Edition) ii opennebula-tools 6.0.0.1-1.ce all OpenNebula command line tools (Community Edition) ``` _ **Master Node Services** _ ```auto opennebula-fireedge.service loaded active running OpenNebula FireEdge Server opennebula-flow.service loaded active running OpenNebula Flow Service opennebula-gate.service loaded active running OpenNebula Gate Service opennebula-guacd.service loaded active running OpenNebula Guacamole Server opennebula-hem.service loaded active running OpenNebula Hook Execution Service opennebula-novnc.service loaded active running OpenNebula noVNC Server opennebula-scheduler.service loaded active running OpenNebula Cloud Scheduler Daemon opennebula-ssh-agent.service loaded active running OpenNebula SSH agent opennebula-sunstone.service loaded active running OpenNebula Web UI Server opennebula.service loaded active running OpenNebula Cloud Controller Daemon opennebula-showback.timer loaded active waiting OpenNebula's periodic showback calculation opennebula-ssh-socks-cleaner.timer loaded active waiting OpenNebula SSH persistent connection cleaner ``` _ **Master Node** _ ```auto No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.2 LTS Release: 20.04 Codename: focal ``` _ **Node 1** _ ```auto No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.2 LTS Release: 20.04 Codename: focal ``` ---
**Author:** ![rdiaz](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/rdiaz/32/6416_2.png) [@rdiaz](https://forum.opennebula.io/u/rdiaz)\ **Post date:** [May 12, 2021, 7:11am UTC](https://forum.opennebula.io/t/question-about-bridged-networks/9519/2 "2021-05-12T07:11:39Z")
Hi @alessandro.caetano, Driver `bridge` will be in charge of configuring the Linux bridge if not present when a VM is instantiated on a host. However, you’ll be in charge of configuring the routing in case you want to have Internet access in VMs. Cheers. ---
**Author:** ![alessandro.caetano](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@alessandro.caetano](https://forum.opennebula.io/u/alessandro.caetano)\ **Post date:** [May 12, 2021, 12:31pm UTC](https://forum.opennebula.io/t/question-about-bridged-networks/9519/3 "2021-05-12T12:31:26Z")
Hello @rdiaz , Are there any good tutorials on how to do that? ---
**Author:** ![feldsam](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/feldsam/32/4441_2.png) [@feldsam](https://forum.opennebula.io/u/feldsam)\ **Post date:** [May 12, 2021, 8:10pm UTC](https://forum.opennebula.io/t/question-about-bridged-networks/9519/4 "2021-05-12T20:10:39Z")
Hello, hard help you, if we don’t know your netowrk topology. Looks like you have router/gateway with NAT and you need to setup network for VMs to access this gateway to get internet access ---
**Author:** ![alessandro.caetano](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@alessandro.caetano](https://forum.opennebula.io/u/alessandro.caetano)\ **Post date:** [May 22, 2021, 12:23am UTC](https://forum.opennebula.io/t/question-about-bridged-networks/9519/5 "2021-05-22T00:23:09Z")
It was easier for me to configure bridges manually in the hosts, I still don’t know the usability of the driver bridge if it’s for me to manually create routes.