What is Authentication Header and how it provides the protection to IP header?

What is Authentication Header and how it provides the protection to IP header?

Basically Authentication Header protects IP header and provides the complete authenticity to the IP packets.

AH may work in two ways: transport mode and tunnel mode.

In tunnel mode; AH protects the IP header using two IP header layers inner and outer. Inner IP header is used to contain the source and destination addresses, and the outer IP header is used to contain the security gateway information.
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