A question for IPsec ---ISAKMP

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I remembered that pre shared key use for ISAKMP phase-1.
for authentication. Is that right? (ESP)

There are total six frames for main mode during phase 1
First two frames look easy to understand.
How about the third and fourth frame. What do they do in detail?
Can anyone give a little bit more detail operation?


Re: A question for IPsec ---ISAKMP

You are generally correct. Frames 3 and 4 - this is diffie hellman group
Bartosz Gagat
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