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Microsoft VPN solution and NAT

I'm trying to establish a l2tp connection between two microsoft boxes.

I have a cisco 2821 with ios 12.3 Can anyone point me in the right direction for a guide or tutorial?

Currently I'm using an access list to translate the traffic something like:

ip nat pool l2tp_serv 10.10.10.201 10.10.10.201 netmask 255.255.255.0

ip nat inside source list 190 pool l2tp_serv

access-list 190

10 permit esp any any

20 permit ahp any any

30 pemmit udp any eq isakmp any eq isakmp

40 pemit udp any eq non500-isakmp any eq non500-iskmp

admitedly, I don't understand nat well enough, much less l2tp/IPsec. It would be much easier if my company would just purchase a easy vpn device or something along those lines. However for now, I work with what I have :)

I also have a access-list for any connections outbound overloaded on the outside interface, so any traffic outbound should have no problems.

Thank you for any suggestions.

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