NAT a share folder

Hello experts.
i have a windows server with a share folder..
user inside the office have that folder mapped into their computer...

i want people outside the office access that share folder..
so i am going to allow my firewall to do the NAT..
the question is..

what service use share folder ?
will be like this
allow SOURCE FROM -- specific IP
DESTINATION ---- MY PUBLIC

buttt

what service is the one share folder use ?
LVL 3
nickt25Asked:
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Ashok DewanFreelancerCommented:
You need to NAT between ports no. 137,138,139 and 445. But its risky. SMB is always get vulnerable via new techniques.
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Ernie BeekExpertCommented:
Imho it wouldn't be wise to just punch some holes in the firewall to grant access to shares. I would suggest that users set up a VPN and through that access that share.
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nickt25Author Commented:
hello guys
i just found the service is
microsoft-ds

i would love to use a VPN  but is too slow..
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nickt25Author Commented:
thanks  guys
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