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From Kelven Yang <>
Subject RE: basic zone for public clouds
Date Fri, 18 May 2012 18:17:34 GMT

> -----Original Message-----
> From: Murali Reddy []
> Sent: Friday, May 18, 2012 10:16 AM
> To:
> Subject: Re: basic zone for public clouds
> >
> >
> >
> >> When EIP feature is enabled, all tenant instances automatically get a
> >> public IP that is 1:1 NAT to their RFC1918 IP.
> >
> >Is it true for SSVM and CPVM as well? If so, it will be a minor change
> >for SSVM and CPVM to hand out the public IP backed by EIP to support the
> >feature Murali asks. Otherwise, the public IP/VLAN has to be provided
> >inside SSVM/CPVM, while currently SSVM and CPVM do not do that by
> default.
> >
> I think SSVM, CPVM will have to use public IP backed by EIP model.
> Directly assigning public IP to SSVM, CPVM may result them to be
> non-routable. For e.g NetScaler that provides EIP/ELB service can be the
> only data entry/exit point in a zone and may be setup in two-arm mode[1]
> where only NetScaler is in public network. So SSVM/CPVM on the pod's
> subnet may not be reachable even if they have public IP.

This is what I preferred and suggested. When EIP is enabled, SSVM/CPVM just needs to hand
out EIP backed public IPs to their clients, no other changes will be needed within existing

> [1]:
> map-
> 91/ns-nw-twoarm-mul-sbnt-con.html

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