Internet Key Exchange Version 2 (IKEv2) Parameters

5 0 0 1 0 1zM15. This document also provides information on how to translate internet Key Exchange Version 2 (IKEv2) Parameters debug lines in an ASA configuration.

This document does not describe how to pass traffic after a VPN tunnel has been established to the ASA, nor does it include basic concepts of IPSec or IKE. Requirements Cisco recommends that you have knowledge of the packet exchange for IKEv2. The information in this document was created from the devices in a specific lab environment. If your network is live, make sure that you understand the potential impact of any command.

IKE and IPSec debug commands in order to understand where there is a problem with IPSec VPN tunnel establishment, but the commands can be cryptic. DART logs have been omitted in this example due to insignificance. A VPN connection to Anu-IKEV2 has been requested by the user. Description : Tunnel initiated by GUI Client. The client initiates the VPN tunnel to the ASA. The ASA receives the IKE_SA_INIT message from the client. The first pair of messages is the IKE_SA_INIT exchange.

SAi1 – Cryptographic algorithm that IKE initiator supports. KEi – DH public key value of the initiator. IKEv2-PROTO-4: Next payload: SA, version: 2. Computes its own DH secret key. The ASA constructs the response message for IKE_SA_INIT exchange. SAr1 – Cryptographic algorithm that IKE responder chooses.

KEr – DH public key value of the responder. The ASA sends out the response message for IKE_SA_INIT exchange. The IKE_SA_INIT exchange is now complete. The ASA starts the timer for the authentication process. The client shows the IPSec tunnel as ‘initiating.

The client omits the AUTH payload from message 3 in order to indicate a desire to use extensible authentication. The client initiates a connection to the ASA on port 4500. Only a single EAP authentication method is allowed within an EAP conversation. The ASA receives the IKE_AUTH message from the client. IKEv2-PROTO-4: Next payload: ENCR, version: 2.

The ASA generates a response to the IKE_AUTH message and prepares to authenticate itself to the client. Created element name version value 9. Added element name version value 9. IKEv2-PLAT-3: ikev2_osal_redirect: Session accepted by 10. The ASA sends the AUTH payload in order to request user credentials from the client. Since the ASA is willing to use an extensible authentication method, it places an EAP payload in message 4 and defers sending SAr2, TSi, and TSr until the initiator authentication is complete in a subsequent IKE_AUTH exchange.

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Thus, those three payloads are not present in the debugs. Code: request – This code is sent by the authenticator to the peer. 1 – The id helps match the EAP responses with the requests. Here the value is 1, which indicates it is the first packet in the EAP exchange. ASA to the client in order to initiate the EAP exchange. Length: 150 – Length of the EAP packet includes the code, id, length, and EAP data. Fragmentation can result if the certificates are large or if certificate chains are included.

Both initiator and responder KE payloads can also include large keys, which can also contribute to fragmentation. Description: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider. The certificate sent by the ASA is presented to the user. The client responds to the EAP request with a response. Code: response – This code is sent by the peer to the authenticator in response to the EAP request. EAP exchange and is waiting for the ASA to generate the authentication request.

Length: 252 – Length of the EAP packet includes the code, id, length, and EAP data. EAP request packet from the ASA. This is what the ‘init’ EAP response packet contains. This is the second request sent by the ASA to the client.

2 – The id helps match the EAP responses with the requests. Here the value is 2, which indicates it is the second packet in the exchange. ASA is requesting that the client send the user authentication credentials. Length: 457 – Length of the EAP packet includes the code, id, length, and EAP data. This payload is decrypted, and its contents are parsed as additional payloads.

Client sends another IKE_AUTH initiator message with the EAP payload. Length: 420 – Length of the EAP packet includes the code, id, length, and EAP data. The client had requested that the user enter credentials. This EAP response has the ‘config-auth’ type of ‘auth-reply. This packet contains the credentials entered by the user. The ASA builds a third EAP request in the exchange.

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3 – The id helps match the EAP responses with the requests. Here the value is 3, which indicates it is the third packet in the exchange. ASA has received a reply, and the EAP exchange is complete. Length: 4235 – Length of the EAP packet includes the code, id, length, and EAP data. The ASA sends the VPN configuration settings in the ‘complete’ message to the client and allots an IP address to the client from the VPN pool.

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The client sends the initiator packet with the EAP payload. EAP ‘complete’ message sent previously by the ASA . Length: 173 – Length of the EAP packet includes the code, id, length, and EAP data. The EAP exchange is now successful. Since the EAP exchange is successful, the client sends the IKE_AUTH initiator packet with the AUTH payload. The AUTH payload is generated from the shared secret key. IKEv2-PLAT-1: Crypto Map: Map dynmap seq 1000.

The ASA builds the IKE_AUTH response message with the SA, TSi, and TSr payloads. AUTH payload – With the chosen authentication method. CFG_REPLY allows an IKE endpoint to request information from its peer. If an attribute in the CFG_REQUEST configuration payload is not zero-length, it is taken as a suggestion for that attribute. The CFG_REPLY configuration payload may return that value or a new one. It may also add new attributes and not include some requested ones.

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Requestors ignore returned attributes that they do not recognize. SAr2 – SAr2 initiates the SA, which is similar to the phase 2 transform set exchange in IKEv1. TSi and TSr – The initiator and responder traffic selectors contain, respectively, the source and destination address of the initiator and responder in order to forward and receive encrypted traffic. The address range specifies that all traffic to and from that range is tunneled. If the proposal is acceptable to the responder, it sends identical TS payloads back. The ASA sends out this IKE_AUTH response message, which is fragmented into nine packets. The IPsec connection has been established.

Description : The profile configured on the secure gateway is: Anyconnect-ikev2. The client reports the IPSec connection as established. The client also detects the user profile on the ASA. Establishing VPN – Activating VPN adapter. Description : A new network interface has been detected. XML profile is loaded onto the client. Since the client now has an IP address from the ASA, the client proceeds to activate the VPN adapter.

Description : The VPN connection has been established and can now pass data. The client reports the tunnel as up and ready to pass traffic. Crypto map tag: dynmap, seq num: 1000, local addr: 10. 5 0 0 1 0 1zM15. This document also provides information on how to translate certain debug lines in an ASA configuration. This document does not describe how to pass traffic after a VPN tunnel has been established to the ASA, nor does it include basic concepts of IPSec or IKE. Requirements Cisco recommends that you have knowledge of the packet exchange for IKEv2.

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The information in this document was created from the devices in a specific lab environment. If your network is live, make sure that you understand the potential impact of any command. IKE and IPSec debug commands in order to understand where there is a problem with IPSec VPN tunnel establishment, but the commands can be cryptic. DART logs have been omitted in this example due to insignificance. A VPN connection to Anu-IKEV2 has been requested by the user. Description : Tunnel initiated by GUI Client. The client initiates the VPN tunnel to the ASA.

The ASA receives the IKE_SA_INIT message from the client. The first pair of messages is the IKE_SA_INIT exchange. SAi1 – Cryptographic algorithm that IKE initiator supports. KEi – DH public key value of the initiator.

IKEv2-PROTO-4: Next payload: SA, version: 2. Computes its own DH secret key. The ASA constructs the response message for IKE_SA_INIT exchange. SAr1 – Cryptographic algorithm that IKE responder chooses. KEr – DH public key value of the responder. The ASA sends out the response message for IKE_SA_INIT exchange.

The IKE_SA_INIT exchange is now complete. The ASA starts the timer for the authentication process. The client shows the IPSec tunnel as ‘initiating. The client omits the AUTH payload from message 3 in order to indicate a desire to use extensible authentication. The client initiates a connection to the ASA on port 4500. Only a single EAP authentication method is allowed within an EAP conversation.

The ASA receives the IKE_AUTH message from the client. IKEv2-PROTO-4: Next payload: ENCR, version: 2. The ASA generates a response to the IKE_AUTH message and prepares to authenticate itself to the client. Created element name version value 9. Added element name version value 9. IKEv2-PLAT-3: ikev2_osal_redirect: Session accepted by 10. The ASA sends the AUTH payload in order to request user credentials from the client.

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Since the ASA is willing to use an extensible authentication method, it places an EAP payload in message 4 and defers sending SAr2, TSi, and TSr until the initiator authentication is complete in a subsequent IKE_AUTH exchange. Thus, those three payloads are not present in the debugs. Code: request – This code is sent by the authenticator to the peer. 1 – The id helps match the EAP responses with the requests. Here the value is 1, which indicates it is the first packet in the EAP exchange. ASA to the client in order to initiate the EAP exchange. Length: 150 – Length of the EAP packet includes the code, id, length, and EAP data.

Fragmentation can result if the certificates are large or if certificate chains are included. Both initiator and responder KE payloads can also include large keys, which can also contribute to fragmentation. Description: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider. The certificate sent by the ASA is presented to the user. The client responds to the EAP request with a response. Code: response – This code is sent by the peer to the authenticator in response to the EAP request.

EAP exchange and is waiting for the ASA to generate the authentication request. Length: 252 – Length of the EAP packet includes the code, id, length, and EAP data. EAP request packet from the ASA. This is what the ‘init’ EAP response packet contains. This is the second request sent by the ASA to the client. 2 – The id helps match the EAP responses with the requests.

Here the value is 2, which indicates it is the second packet in the exchange. ASA is requesting that the client send the user authentication credentials. Length: 457 – Length of the EAP packet includes the code, id, length, and EAP data. This payload is decrypted, and its contents are parsed as additional payloads. Client sends another IKE_AUTH initiator message with the EAP payload.