On 10/11/2014 03:08 PM, Joel A Divekar wrote:

Hi All

We have setup a Centos7 host server with KVM and have created multiple VM running Ubuntu 14.04 using virt-manager. All VMs are having forward mode as "NAT" and using internal DHCP IP address 192.168.122.x series and we gave them fixed ips based on their mac address. Now all these VMs are able to access Internet and able to run update on all these guest OS. But these VMs are web and API servers and they are required to be accessible from Internet.

We have pool of public IPs and have assigned host with one public IP for example, we have pool like 192.168.111.1 to 192.168.111.25. We have assigned 192.168.111.2 to Host server and would like to assign 192.168.111.3 to Webserver and 192.168.111.4 to API server. So we changed our virsh network settings from default to routed as <forward mode='route' dev='em1'> and struggling to configure fixed IPs for our VMs.

In order to use a libvirt network with forward mode='route', you must have an *entire subnet* available to assign to the libvirt network, and the rest of your physical network must have a route entry for that subnet which points to your host's physical-side IP address as the gateway. Since you say that you only have 192.168.111.1 - 192.168.111.25 available, I am guessing that you don't have an entire subnet, and that you probably aren't able to alter the routing tables of routers on the physical network, so routed mode will not work for you.

If, instead, the case is that your host's physical-side (i.e. em1) IP address is 192.168.111.2, you should instead investigate putting a Linux host bridge on that interface, and configuring the guests for a bridged network connection:

http://wiki.libvirt.org/page/Networking#Host_configuration_2

We would like to do exactly as mentioned in this link https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Administration_Guide/sub-sect-routed-mode-libvirt.html

We have been struggling with this for last 3 days and no luck. Please can anybody guide us.

Regards

Joel Divekar

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