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HP Procurve Switching

I am using HP Procurve switches on my network.  I have multiple vlans for data as well as voice.  I am installing a new 8212 core switch and I need to get public internet access from our datacenter on the third floor to a division on our first floor.  What is the best way to get this connection to the location using our infrastructure.  My guess is to use an ACL but I am not really sure where to start.  I need to be sure nobody using this public network has any type of access to our corporate network.  Suggestion or examples would be very helpful.
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normally I would have several vlans within my network like this:


so internal data and voice are for internal pcs and servers and are terminated at a firewall's internal interface
dmz vlan would contain dmz servers and firewall's dmz interface
external vlan would contain ISP link and firewall's wan interface.

so I would suddenly being asked to provide clear internet to a specific pc, then I would configure one more port in external vlan and plugged that PC into that port.
PtFirstAuthor Commented:
Do you have any example configs for me to look at.  Do you not need any acl to be sure that data cannot pass between the vlans?
if your vlans are routeable, then you need firewall (not acls)
if your switch is not doing any routing between vlans, then you don't need acls also.

unfortunately I don't have any procurves near by to give you an example...

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