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VPN in a ISA Back-to-Back topology - 13.Dec.2001 6:30:00 AM

Sutton

Posts: 53
Joined: 12.Dec.2001
From: Sydney, New South Wales, Australia
Status: offline

Hi All,

I have exhausted all Microsoft documentation. My question is this ...

Q Is it possible to terminate an external client VPN connection on an internal ISA server's DMZ interface? given ...

1 - Back-to-Back topology.
2 - Private IP addressing in the DMZ.
3 - Internal ISA has single interface into the DMZ.
4 - VPN protocol is PPTP/MPPE.

I would assume, at this point, that the external ISA server accepts the remote client VPN connection on its public interface and then proxies the VPN connection to the internal ISA server.

Need answer for a design. Help please!

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RE: VPN in a ISA Back-to-Back topology - 17.Dec.2001 7:24:00 PM

tshinder

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline

Inline...

quote:
Originally posted by Sutton:
Hi All,
I have exhausted all Microsoft documentation. My question is this ...
Q Is it possible to terminate an external client VPN connection on an internal ISA server's DMZ interface? given ...
1 - Back-to-Back topology.
---No.
2 - Private IP addressing in the DMZ.
---Definitely No!
3 - Internal ISA has single interface into the DMZ.
4 - VPN protocol is PPTP/MPPE.
---No VPN connections can terminate past the 'external' ISA Server.
I would assume, at this point, that the external ISA server accepts the remote client VPN connection on its public interface and then proxies the VPN connection to the internal ISA server.
---ISA doesn't proxy VPN connections. The only thing ISA Server does with VPN connections is create a couple of packet filters. The rest is RRAS.

Need answer for a design. Help please!