Document access via WAN in portal

Hi,
I have the following problem. I have installed portal with KM in place A and some users are in place B. Both places are connected via WAN (1Mbit/s). Users in place B have some documents stored in there LAN so they can access them relatively quickly. But they would like to use functionality of KM. When I move their documents to the portal they will access these files over WAN connection. Is there some alternative solution? (users can navigate to the document via portal but than they download them from LAN). Can this be solved by WebDAV or Web repository manager?
Thanks a lot,
Zdenek

Hi Praskah,
thanks for help but I would like to avoid network traffic between two WAN locations. Imagine that you have 10MB file on network A on some WebDAV server for example that is in network A too. Portal resides in network B which is conntected with network A via 1mbit/s connection. Webdav repository is connected to this portal. I suppose that if you want to download your document from portal you must firstly transfer it from network A to network B (to the portal) and then from network B to network A again (to your desktop).
My question is: Can I avoid described useless network traffic and download document directly from network A?

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