Why not authenticate the whole packet in ESP mode?
shivajikobardan
Member Posts: 20 ■■□□□□□□□□
in CCNA & CCENT
In AH:
a) Transport Mode:
Entire packet Authenticated
b) Tunnel Mode:
Entire packet authenticated
In ESP:
1) Transport Mode:
Only ESPH-ESPT authenticated
Original IP Header not authenticated.
2) Tunnel Mode:
Only ESPH-ESPT authenticated
New IP Header not authenticated.
Why is this difference found in them? Is there a reason behind them? Why not authenticate all of the packet? What problem would it create?
And why is there no such thing called AH auth but there's ESP Auth? Shouldn't AH Auth data also be in the figure shown above?
Also, Is there a reason why the modes are named "Tunnel" And "Transport"?
Source:https://networklessons.com/cisco/ccie-routing-switching/ipsec-internet-protocol-security
Comments
-
DCD
Member Posts: 475 ■■■■□□□□□□
Overhead and CPU usage and Transport end to end and Tunnel is site to site.