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AH and ESP used in both phase 1 and 2?

AH and ESP is the protocol used in IKE phase 2 when establishing IPsec SA or also used in the IKE phase 1? If not, what IP packet format used in the IKE phase 1? Thanks

2 REPLIES

Re: AH and ESP used in both phase 1 and 2?

Cisco Employee

Re: AH and ESP used in both phase 1 and 2?

Hello,

You asked

"AH and ESP is the protocol used in IKE phase 2 when establishing IPsec SA or also used in the IKE phase 1?" AH and ESP are only used after the Phase 2 SAs have been built.

"If not, what IP packet format used in the IKE phase 1?" UDP 500 or 4500 (if NAT-T is used)

Hope that helps! If so, please rate.

Thanks

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