Joao is correct - that's why UMDS was created. You can start at Part 2 of my series on VUM and UMDS here Part II – Update Manager Download Service (UMDS) Installation and Configuration Guide | VirtuallyMikeBrown
All the best,
Mike
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Mike Brown
VMware, Cisco Data Center, and NetApp dude
Consulting Engineer
Twitter: @VirtuallyMikeB
Blog: http://VirtuallyMikeBrown.com
LinkedIn: http://LinkedIn.com/in/michaelbbrown