My reading of his question is that he has a Virtual Private Network connection from his house, via his DSL line (150Kb/s) over the Internet, to his office, but when he downloads files from his office over this VPN, he is only getting a maximum of 56Kb/s download. When he downloads from the Internet (not using the VPN) he is getting the full 150Kb/s.
It sounds like his company VPN may be rate limiting to 56Kb/s ... no idea if this is likely, but I would suggest he speak to his company's network people. Also, when using a VPN you have some overhead with extra headers, encryption, etc, but I am not sure this would account for the bandwidth reduction he is seeing.
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