Prevent NAT-T mismatches in Cisco NAT discovery
by Bob Smetana
Prevent mismatch in NAT-Traversal settings when connecting to other networking devices like VNS3. Follow this guide to Disabling NAT traversal on Cisco IOS
NAT-Traversal encapsulates ESP packets inside UDP 4500, while Native IPSec routes ESP traffic using protocol 50. Both sides of an IPSec connection need to agree on which to use.
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By: Margaret Valtierra