The reason to choose multiple ips is  there is a limit (I think it is 7) on the 
hypervisor about number of nic can VM have.
For a nic you can have more than 7 ip addresses.
The multiple ips feature is supported in the basic zone also.

I think multiple nics feature is more useful when user need a nic in different 
network.

Thanks,
Jayapal

> -----Original Message-----
> From: Marcus Sorensen [mailto:shadow...@gmail.com]
> Sent: Monday, 15 April 2013 10:13 PM
> To: Saksham Srivastava
> Cc: dev@cloudstack.apache.org
> Subject: Re: [Add/Remove Network to VM] Multiple NICs on same Guest
> Network
> 
> The functionality was duplicated from deploy allowing multiple NICs, and I
> wasn't involved in the discusion as to why that was decided. There could be
> other reasons why that was put in place, I don't know. At any rate it doesn't
> hurt anything in particular, and I'm not sure how many are using the
> capability in 4.0 and earlier, but they may have gotten used to it.
> 
> 
> On Mon, Apr 15, 2013 at 10:32 AM, Saksham Srivastava <
> saksham.srivast...@citrix.com> wrote:
> 
> >   We have a feature Multiple IPs on the same NIC
> >
> https://cwiki.apache.org/confluence/display/CLOUDSTACK/Multiple+IP+add
> > ress+per+NIC
> >
> > Isn't the functionality covered by this feature.
> >
> > I do not see a strong use case for having both the features (Multi NIC
> > in same network and Multi IP per NIC).
> > Should we allow only one of them, as they both tend to serve the same
> > purpose, or am I missing something?
> >
> > Thanks,
> > Saksham
> >  ------------------------------
> > *From:* Marcus Sorensen [shadow...@gmail.com]
> > *Sent:* Saturday, April 13, 2013 9:03 PM
> > *To:* Saksham Srivastava
> > *Cc:* dev@cloudstack.apache.org
> > *Subject:* Re: [Add/Remove Network to VM] Multiple NICs on same
> Guest
> > Network
> >
> >   I believe it was allowed because one can also create multiple NICs
> > on the same network while deploying a VM.
> >
> > There may be people doing that to get multiple IPS auto-assigned to a VM.
> > On Apr 13, 2013 3:28 AM, "Saksham Srivastava" <
> > saksham.srivast...@citrix.com> wrote:
> >
> >>  Hi,
> >>
> >> Using addNicToVirtualMachine API user can add multiple NICs to a VM
> >>
> >> I am also able to add multiple NICs to a VM on the same isolated
> >> guest network.
> >>
> >> Is this a valid scenario??
> >> If yes what could be the use case for the same?
> >>
> >> Thanks,
> >> Saksham
> >>
> >>

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