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I have two KVM node. In both sever there is a bridge connection for the interface prv1 with network 192.168.15.0/28 and in other KVM node there is a bridge connection for the interface prv1 with network 192.168.15.16/28 . I can create a VM from both interface. But, how can I make a connection so that 192.168.15.0/28 network can be reachable to 192.168.15.16/28 ?

Below is my network diagram in which I want access between VM1 and VM2. Any guide will be appreciate. enter image description here

Niba Tandukar
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1 Answers1

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It's not clear what you are asking for. Your diagrams shows VMs are actually having IPs from the 10.10.15.X range which you aren't mentioning in your question. Besides you didn't told if the prv1 interfaces from both nodes are physically connected to each other.

Do you need a connection for VMs or for the bridges prv1 on the physical nodes? If later, you will a router of some sort between those 2 subnetworks or a dirty hack with onlink routes providing you really have physical connection between prv1 interfaces on your hosts (physical nodes).

I might update my answer once you will update your question to make it more obvious what you require to achieve.

NStorm
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  • Hi , I have just updated my diagram above. It is 20.20.15.X not 10.10.15.X. Both the prv1 are the bridge connection in the node. These bridge connection are virtual network for KVM. Also these both the bridge connection have vlan of 4001. – Niba Tandukar Jun 01 '21 at 19:10
  • @NibaTandukar first of all you aren't inserting your image correctly. Please use an "Image" button and don't remove any square brackets it adds. Second it's still not clear what you are asking for. – NStorm Jun 01 '21 at 19:21
  • I want a connection between both the bridges prv1. So that all the VMs created through that bridges connection can access each other.Is the image still not visible? – Niba Tandukar Jun 01 '21 at 19:23
  • @NibaTandukar you didn't answered my questions I've had previously. Like if you have a physical connections between prv1 on nodeA and nodeB. And about connection between VM1 and VM2. – NStorm Jun 01 '21 at 19:24
  • No, there is no physical connection between prv1 NodeA and NodeB @NStorm. It is virtual network for bridge only. – Niba Tandukar Jun 01 '21 at 19:26
  • @NibaTandukar then what's your physical connection path between those? How do suppose to route then? Through the public IPs? Do you need a connections between VMs or physical nodes? – NStorm Jun 01 '21 at 19:29
  • So, here the gateway for these private network is the public IP of these KVM node.ie 5.9.xx.xx for one prv1 and for other 188.44.xx.xx – Niba Tandukar Jun 01 '21 at 19:33
  • @NibaTandukar do you mean that only physical connection between NODE1 and NODE2 are through public IPs? – NStorm Jun 01 '21 at 19:40
  • Yes @NStorm. But the server provider has give vlan for the private virtual network. – Niba Tandukar Jun 01 '21 at 19:44
  • @NibaTandukar then you have to create that VLAN sub-interface on your physical interface. Like if your physical NIC are eth0, you can use your distro tools to add a eth0.4001 interface (which is VLAN-aware). Then you can bridge it to prv1 bridge and that will make both bridges are switched through VLAN 4001. – NStorm Jun 01 '21 at 20:23
  • I have also configure Vlan for both interfaces. Here is my configuration [root@CentOS-79-64-minimal network-scripts]# cat ifcfg-eno1.4001 DEVICE=eno1.4001 BOOTPROTO=none ONBOOT=yes BRIDGE=prv1 [root@CentOS-79-64-minimal network-scripts]# cat ifcfg-prv1 DEVICE="prv1" BOOTPROTO=static ONBOOT=yes TYPE=Bridge IPADDR=192.168.15.1 NETMASK=255.255.255.240 GATEWAY=5.9.xx.xx BROADCAST=192.168.15.15 DNS1=8.8.8.8 DNS2=8.8.4.4 STP=off DELAY=0 VLAN=yes ZONE=internal – Niba Tandukar Jun 01 '21 at 20:28
  • what am I missing ? I am unable to find. Is this configuration correct? – Niba Tandukar Jun 01 '21 at 20:33