Then, next 2 Identity Protection packets both peers exchange Diffie-Hellman public key values and nonces (random numbers) which will then allow both peers to agree on a shared secret key: 71) can pick if it matches its local policies:įair enough, in frame #2 the Responder (. 70) sends a set of Proposals containing a set of security parameters ( Transforms) that Responder (. Sample pcap: IPSEC-tunnel-capture-1.pcap (for instructions on how to decrypt it just go to website where I got this sample capture: )īoth peers add a unique SPI just to uniquely identify each side's Security Association (SA):
We call first 6 messages Phase 1 and last 3 messages as Phase 2.
The Big Pictureįirst 6 Identity Protection (Main Mode) messages negotiate security parameters to protect the next 3 messages (Quick Mode) and whatever is negotiated in Phase 2 is used to protect production traffic (ESP or AH, normally ESP for site-site VPN). Understanding IPSec IKEv2 negotiation on Wireshark 1.
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