I wonder that NAT keepalive can work with TCP packet or not? Or only for UDP package. NAT keepalive package & keepalive package are different?
I have read post: https://www.google.com/amp/s/www.onsip.com/voip-resources/voip-fundamentals/what-is-nat-keepalive%3fhs_amp=true
In this post, they said that "NAT keepalive is a feature that sends very tiny data packets, called UDP packets"