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Community Member

about vpdn

I want to know some thing about vpdn:

1¡¢some material say vpdn is :pptp¡¢l2f¡¢l2tp. I want to know whether there is another kind of vpdn?

2¡¢The lac of l2tp is controled by the isp. Can this kind of vpdn be used widely?

3¡¢I know how to use ipsec with l2tp. But I don't know how to use ipsec with pptp. Can anyone tell me how to achieve it?

Thanks a lot.

1 REPLY
Cisco Employee

Re: about vpdn

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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