檔案分享的疑問?

DC01/DNS/Wins 192.168.7.10
DC02/DNS/Wins 192.168.7.20
DFS 192.168.7.5
Client 192.168.88.41(VPN site)所以DNS設定當地AD/DNS server
問題: Client透過網路芳鄰讀寫DFS分享的資料匣會出現錯誤訊息
錯誤訊息:windows cannot access \\192.168.7.5\......
check the spelling of the name.Otherwise,there might be a problem with your network,To try to identify and resolve network problems,Click Diagnose.
Error code:0x8004005
Unspecified error
目前找到兩個方式連線
1.再設定一組.7.xx的DNS
2.在client mapping Network disk.
我想請教前輩們，若要像早年一樣不做上述設定，就能連線敲密碼開啟檔案，要怎麼做???