troubleshooting Question

Exchange across 2 AD sites - Issuesgetting set up.

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cdshreveFlag for United States of America asked on
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I am putting in a new exchange environment in a new AD site we just set up.  We are treating it ad a DR site but it will be active as far as exchange is concerned - so that I can put DAGs across the sites.  I am aiming at getting it seamless for access to both sites from both sites.  I would like to keep the same external URL for both sites can I do that?

Site A
I have currently 2 CAS servers in an array (not using it because WIN NLB would not work with the vmware) and 4 hub/mbx servers.

externalurl - webmail.company.com/owa (/ecp /oab ...etc)
internalurl = default from install ie  Server.company.com/owa


Site B
I have 2 CAS servers installed and 4 hub/mbx servers.

externalurl - webmail.company.com/owa (/ecp /oab ...etc)
internalurl = default from install ie  Server.company.com/owa

From Site B CAS server:
I can get to OWA on the cas servers on site B for all users on site B if I use the internal url.
I can not get to OWA on the cas servers on site B for all users on site A if I use the internal url.
I can get to users on Site A using the external url, but not Site B users

From Site A Client
I can get to the internalurl for site B OWA and it redirects me (manually) back to the  site A Cas servers.

I can access the mailbox of a Site B homed user from my Outlook 2010 client.

Please help if you can!

Thanks
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