As Saksham clarify at previous mail. We can fetch some useful to convenient, here is some point have clarified by Saksham
* You can always modify the default setting of CIDR 10.1.1.0/24 when you create a zone. * You can create isolated guest networks with your custom CIDR by specifying the netmask and gateway. This overrides the zone level setting. * In shared Networks the start IP - end IP range will define the range of IPs from which Cloudstack Guest VMs get IPs, so you restrict the guest Vms to get IPs from this defined range. * IP reservation in Isolated Guest networks is a new feature in CloudStack which allows to use a part of the guest network for Cloudstack guest Vms and remaining part (if you wish to do so) for non Cloudstack purposes. but here is some confuse me. why distinguish these two kind of network on ip assignment. isolated base CIDR, share need set the ip range manually. ---- best regards