Using the notation from the lectures provide details for the following:

The packet transmitted between Hosts $1$ and $2$ of Lan $A$ if they communicate

using IPSec AH Transport mode.

The packet transmitted between Host $3($Lan A$)$ and Host $5($Lan B$)$ if they

communicate using IPSec AH Tunnel mode.

The packet transmitted between Gateway Lan A and Gateway Lan $B$ if

they communicate using IPSec ESP Tunnel mode.

The packet transmitted between $x$ and $Y$ if $(2)$ and $(3)$ above are combined. $(2)$

first then $(3).$

data

AH

transport mode

longrightarrow wuthenticated except mutable fields longrightarrow

tunnel mode

ESP

Standard

IPv$4$ Packet

AH Tunnel

ESP Tunnel

$($c$)$

ESP$+AH$

Transport

ESP$+AH$

Tunnel

Figure $2\mathrm{.}2$: IPv$4$ packet $($a$)$ with AH $($b$)$ with ESP $($c$)$ with ESP$+$AH

Transport and Tunnel modes