Disaster recovery and public facing

I recently got copied in to a vulnerability assessment report conducted from the outside by a 3rd party company. They were given 2 IP ranges, one seems to be live systems, i.e. mail systems, citrix, website and web apps, and the second range were just called "disaster recovery systems". Why would you have public facing IP range relating to a companies disaster recovery? What purpose would these serve and why would they be open to the public (i.e. public facing)? Would every company have public facing systems that relate to disaster recovery, if so why? I know its "company specific" but I just wondered why any company would have such.
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pma111Asked:
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IanThCommented:
using disaster recovery means no loss of services so it has to be public facing just like production so the dr can act as production if needed

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IanThCommented:
a dr is a copy of production usually
pma111Author Commented:
So for example Citrix, Email, Website/apps it would just be a clone of those?
How do they "stay up" if the architecuture within the private network collapses?
Could you perhaps expand in the context of a citrix environment with public facing gateway, how if internal systems went down you could still do business? And how these systems are cloned so if one goes down the other can stay up?
Is it common everyone with say a citrix gateway web app will also have a DR citix access gateway too?
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