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From Alex Huang <Alex.Hu...@citrix.com>
Subject RE: will IP assigned to a guest VM(via DHCP) ever expiry or will need renewal...?
Date Tue, 24 Jul 2012 16:49:36 GMT
I think we do need a better description of how things like ip changes in cloudstack.  Can someone
write this up?

--Alex

> -----Original Message-----
> From: Alena Prokharchyk [mailto:Alena.Prokharchyk@citrix.com]
> Sent: Tuesday, July 24, 2012 9:51 AM
> To: cloudstack-dev@incubator.apache.org; Sheng Yang
> Subject: Re: will IP assigned to a guest VM(via DHCP) ever expiry or will need
> renewal...?
> 
> On 7/24/12 7:53 AM, "Ram Ganesh" <Ram.Ganesh@citrix.com> wrote:
> 
> >Hi All,
> >
> >Would like to know if an IP assigned by CloudStack via its DHCP server
> >to a guest VM will ever expire? Or is it ok to assume the IP will be
> >assigned to a guest VM as long as it is not destroyed. We are exploring
> >means to enhance our load balancer to support DHCP and once we acquire
> >an IP we would assign it statically to the load balancer device. Please
> >let me know
> >
> >Thanks,
> >Ram
> >
> >
> 
> 
> It will not expire in most of the cases - the IP will stick to Vm for the entire
> lifecycle as the cidr for the network doesn't change once its set usually.
> 
> But if external device (Netscaler, Juniper SRX) is used as a provider for the
> network, then the cidr for the network is calculated dynamically every time
> the network gets shutdown/re-implemented. As the CIDR changes, so do all
> the user vms' ips.
> 
> Sheng, please confirm.
> 
> -Alena.


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