Nested Tunneling

Host A

Host B

RA

RB

1.1.1.1

1.1.1.2

2.2.2.1

2.3.2.2

3.3.3.1

3.3.3.2

IP header ESP IP header AH IP header data

Src=2.2.2.1

Dst=2.3.2.2

Src=1.1.1.1

Dst=2.3.2.2

Src=1.1.1.1

Dst=3.3.3.2

IP header ESP IP header ESP IP header data

Src=RB

Dst=Host C

Src=RA

Dst=RC

encrypted

Host A

Host B

RA

RC

RB

Valid nested tunnel

Invalid nested tunnel

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