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2025
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5
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NAT T with Anyconnect

Niranjani
Level 1
Level 1

How NAT Traversal works with anyconncet??

4 Replies 4

balaji.bandi
Hall of Fame
Hall of Fame

And if you want to use TLS instead of IPsec, then there is nothing like NAT-T needed.

Edwin Portillo
Spotlight
Spotlight
My friend,
you can review the following informaction, will be very helpful:
https://thejimmahknows.com/nat-traversal-ipsec/

aninayak
Cisco Employee
Cisco Employee
Anyconnect has 2 connection methods
default is SSLVPN based-- no NAT-Traversal impact
IPSec based (at present ikev2 is only supported)-- NAT-T preforms 2 things
1.Detects if both ends support NAT-T
2.Detects NAT devices along the transmission path (NAT-Discovery)

For details please refer to https://community.cisco.com/t5/security-documents/how-does-nat-t-work-with-ipsec/ta-p/3119442
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