How does it works VPN behind PAT

Hello

Everywhere it is said, "If PAT is applied when a client tries to establish a VPN connection to a remote site, you must activate IPSEC over UDP, TCP, or NAT - T. The thing is that I use a DSL modem at home. And even when I disable transparent tunnelling on my Cisco VPN Client software of connection VPN works well? How can this be possible. is not, we know that the IPSEC packets cannot be PATed?

MOST devices have IPSec PAT packages ' ing wrong, simply because there is no TCP or UDP port on the basis of the PAT number. It is not that the packages may not be PAT would have, it's just that most of the devices are not smart enough to be able to do, and therefore you should encapsulate your IPSec in UDP or TCP packets.

I would just say to your modem ADSL is smart enough to understand about you use IPSec and it will be based on a different value in the PAT package. You can have questions from two clients behind this device, like the PAT tool will quite often only able to manage a.

Routers Cisco were able to do that since the code of 12.2 (15) T, so it is not rare that it works.

Tags: Cisco Security

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