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From Alex Hartner <ahart...@Thunderhead.com>
Subject RE: Reserving IP address in DHCP range
Date Fri, 21 Mar 2014 06:04:03 GMT
I was afraid of this. Just want to confirm that to avoid conflict between static and dynamic
addresses I have to use separate networks.

I wonder how this affects services which rely on multicast / broadcast to work between the
VMs. I fear it may not work in the case of separate networks.

Thanks for your help.
Alex

-----Original Message-----
From: Sanjeev Neelarapu [mailto:sanjeev.neelarapu@citrix.com] 
Sent: Friday, 21 March 2014 1:31 PM
To: users@cloudstack.apache.org
Subject: RE: Reserving IP address in DHCP range

I think in the same guest network we can't have few VMs with dynamic IP addresses and others
with static. 


-----Original Message-----
From: Alex Hartner [mailto:ahartner@Thunderhead.com] 
Sent: Friday, March 21, 2014 10:39 AM
To: users@cloudstack.apache.org
Subject: RE: Reserving IP address in DHCP range

Hi Sanjeev,

Thanks for getting back to me. I found this article as well, however it mentions:

"If your customers wish to have non-CloudStack controlled VMs or physical servers on the same
network, they can share a part of the IP address space that is primarily provided to the guest
network."

In our case we want to allocate some cloudstack contolled VM with dynamic IP addresses and
others with static ones. We don't have any non-cloudstack controlled VMs in this scenario.

Would this approach still work in this case ?

If this is the case what are the options of configuring the size of the reserved range. Using
/26 gives us : 10.1.1.64 to 10.1.1.254 which is quite large. Ideally we would only need a
static range of around 50 addresses with the remainder open to dynamic allocation.

Regards
Alex




Alex Hartner
Enterprise Architect

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M
mailto:ahartner@Thunderhead.com

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-----Original Message-----
From: Sanjeev Neelarapu [mailto:sanjeev.neelarapu@citrix.com]
Sent: Friday, 21 March 2014 12:57 PM
To: users@cloudstack.apache.org
Subject: RE: Reserving IP address in DHCP range

Hi Alex,

We can reserve few IP address range from the guest CIDR for static allocation.
E.g. if guest CIDR is 10.x.x.0/24 you can reserve IP range 10.x.x.0/26 for static allocation.
For more information please refer to http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.2.0/html/Installation_Guide/reserved-ip-addresses-non-csvms.html

Regards,
Sanjeev

-----Original Message-----
From: Alex Hartner [mailto:ahartner@Thunderhead.com]
Sent: Thursday, March 20, 2014 4:43 PM
To: CloudStack-Users
Subject: Reserving IP address in DHCP range

Hi all,

Most of our systems are allocated IP addresses from the CIDR of the guest network which is
defined at 10.X.X.0/24. Some of our VMs require a static IP address, so we allocate these
manually on startup and specify the IPADDRESS attribute on the startup request (example :
nic>ipaddress=10.X.X.254). Since the “static” ip addresses are assigned from the top
end of the range and the “dynamic” ones are assigned starting from the bottom we didn’t
have an issue initially. However with the number of VMs growning we not entered a phase where
the address ranges overlap.

My question is what are the options for reserving certain addresses on the guest network for
manual allocation. Is it sufficient to acquire the ip addresses, and will I be able to assign
an acquired IP address to a VM on startup ?

Regards
Alex




Alex Hartner
Enterprise Architect
T +44 20 8238 7423
F
M
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