Just to correct myself, this is not an SMB protocol issue. I believe this has to do with the inherent reliability issues surrounding the UDP protocol. Unlike TCP, UDP can't re-transmit lost data packages. This becomes a problem when downloading large files; one lost package and the entire download fails. When analyzing a file download using MS Network Monitor 3.4, it's apparent that the IPv4 internet protocol, together with ESP data packages (encrypted data) encapsulated within UDP data packages, are used. UDP is fast and great for streaming services, where loss of single data packages is uncritical; it's just a missing pixel on the screen. I wish Meraki offered a TCP solution with its VPN server, which should solve this problem.
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