Cisco no crypto ipsec nat-transparency udp-encapsulation

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How NAT-T Works
In this blog post, we're going to walk through NAT Traversal and the different considerations to think about when a firewall is in the path. Both routers need crypto ipsec nat-transparency udp-encapsulation enabled, which is the default setting. Let's look at sample configs for. First ask them why they want to disable it. NAT-T is part of the IPsec standard and only adds an additional UDP-Header if there is a NAT. If there is no NAT.