CER PUB and SUB in Different Locations

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I currently have two servers for CER, a pub and a sub.   The customer wants to put these two servers at different locations for disaster recovery.  I know exactly how to configure a Pub in Sub for CER but I'm wondering what are the network requirements for this type of design.  I've been through all the Doc's on CER but I'm not finding anything.  Any help would be appreciated.  Thanks

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I found the answer to my question in the install Guide.   
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Consider installing the standby server in a physically separate location from the primary server, and on a separate subnet not separated by a WAN link.”  Hope this helps someone else in the future

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