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From Saksham Srivastava <>
Subject Re: why not share network use the same CIDR mechanism to assign ip to guest vm. but only isolated network?
Date Thu, 28 Feb 2013 10:24:45 GMT

A shared network can be created only by admin and could be shared across 
multiple accounts.
Isolated networks can be created by both admin and users.

The difference is:

For creating isolated guest network :
You CAN specify the gateway and netmask (which gets converted internally 
to CIDR),but it is not mandatory,

if you don't specify gateway and netmask, zone level CIDR is used.

For creating shared networks :
Gateway and netmask is mandatory, it never picks up from zone setting.

Hope it clears your doubt.

There has been a recent discussion on replacing the gateway/netmask 
combo with CIDR.
May be after some more community discussion you could create an issue to 
replace gateway/netmask combination with CIDR only.


On Thursday 28 February 2013 02:23 PM, Wang Fei wrote:
> 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 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
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