In accepted terms, vpdn usually refers to l2f/l2tp and in some cases pptp, as in some Cisco devices ie
PIX and IOS, PPTP configuration uses the vpdn keyword.
On L2TP, normally the LAC, wherein the clients initially connects to, is controlled by an ISP and then the ISP tunnels the connection to the corporate LNS for eventual forwarding to the corporate network.
Most organisations, outsource this functioanility to their ISP due to cost advantage of such.
IPSec and PPTP are two different encryption altogether. You don't normally mixed them together.
If you want to provide data encryption for your PPTP
data payload, then use MPPE, which is Microsoft's data encryption for PPTP.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...