scp big files stalled over VPN

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http://www.linuxquestions.org – Hi gurus, I have a problem where scp big file over VPN will stalled after few Megabytes are copied. I did some research and someone said it is MTU related, but I can't find a "confirmed" solution for this. Can anyone please advise? Also, we are developing network programmings over the same network. Should I expect similar "stalled" problem for my socket operations? Or is this only specific for scp/sftp operation? Thanks so much. gyc (HowTos)