The sample configuration connects a Cisco ASA device to an Azure route-based VPN gateway. Any luck getting this to work? If your network is live, make sure that you understand the potential impact of any command. Note: In this output, unlike in IKEv1, the PFS DH group value appears as "PFS (Y/N): N, DH group: none" during the first tunnel negotiation, but, after a rekey occurs, the right values appear. #address 10.0.0.2. ", https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/Security/Security-Book/security-book_chapter_01.html?bookSearch=true#c_Configuring_IKE_Enabled_IPsec_Tunnels_12216.xml. Same here. My template for 'VPN Interface IPsec' looks like this: Then, this template is added under the Service VPN : I thought it was all working fine, however I now have a new problem.IKEv2 is working for Phase 1, but IPSEC is failing.For some reason the ISR4K is creating 16 SA's whilst Zscaler only support a maximum of 8 SA's, therefore the tunnel is currently unusable. Windows or MAC (native or AC) client can only use Certificates or EAP. I'll log a TAC case next. 05:29 AM. These debug commands are used in this document: *Nov 11 20:28:34.003: IKEv2:Got a packet from dispatcher *Nov 11 20:28:34.003: IKEv2: Processing an item off the pak queue *Nov 11 19:30:34.811: IKEv2:% Getting preshared key by address 10.0.0.2 *Nov 11 19:30:34.811: IKEv2:Adding Proposal PHASE1-prop to toolkit policyle *Nov 11 19:30:34.811: IKEv2:(1): Choosing IKE profile IKEV2-SETUP *Nov 11 19:30:34.811: IKEv2:New ikev2 sa request admitted *Nov 11 19:30:34.811: IKEv2:Incrementing outgoing negotiating sa count by one. The first CHILD_SA is created for the proxy_ID pair that matches the trigger packet. The information in this document is based on these software and hardware versions: The information in this document was created from the devices in a specific lab environment. Hence, you would see 'PFS (Y/N): N, DH group: none' until the first rekey. Tunnel is up on the Responder. The documentation set for this product strives to use bias-free language. I have a working IPSEC project in GNS3 that uses csr1000 and 7200 routers, VTI interfaces, and IKEv1. They contain the source and destination address of the initiator and responder respectively for forwarding/receiving encrypted traffic. If the SA offers include different DH groups, KEi must be an element of the group the initiator expects the responder to accept. First pair of messages is the IKE_SA_INIT exchange. Cisco recommends that you have knowledge of the packet exchange for IKEv2. With IKEv1, you see a different behavior, because Child SA creation happens during Quick Mode, and the CREATE_CHILD_SA message has a provision to carry the Key Exchange payload that specifies the DH parameters to derive a new shared secret. Create VPN Gateway Policy (Phase1) To create a Phase1 VPN policy, go to Configuration -> VPN -> IPSec VPN and click on the " VPN Gateway " tab. crypto ikev2 authorization policy FlexVPN, encryption 3des aes-cbc-128 aes-cbc-192 aes-cbc-256, crypto ipsec transform-set ESP-GCM esp-gcm, crypto ipsec transform-set AES-CBC esp-aes 256 esp-sha256-hmac, crypto ipsec transform-set AES-CBC1 esp-aes esp-sha-hmac, crypto ipsec transform-set AES-CBC2 esp-3des esp-sha-hmac, set transform-set AES-CBC AES-CBC1 AES-CBC2 ESP-GCM, ip local pool FlexVPN 10.7.1.231 10.7.1.239. This packet contains: ISAKMP Header(SPI/ version/flags), SAr1(cryptographic algorithm that IKE responder chooses), KEr(DH public Key value of the responder), and Responder Nonce. This is reposted from the Networking Academy area since there were no replies. Router 2 builds the response to IKE_AUTH packet that it received from Router 1. Local Type = 0. It's in roadmap. Cisco Community Technology and Support Security VPN Remote Access IKEv2 Auth exchange failed 33016 5 2 Remote Access IKEv2 Auth exchange failed Go to solution mustafa.chapal Beginner 08-08-2018 01:52 PM - edited 03-12-2019 05:29 AM Hi, It seems like it's not passing domain information. You can configure IPsec on tunnels for VPN 1 through 65530, except for 512. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/System-Interface/systems-interfaces-book/configure-interfaces.html. I believe it is specific to ISR4K's and being fixed in the November code release. The sample requires that ASA devices use the IKEv2 policy with access-list-based configurations, not VTI-based. These messages negotiate cryptographic algorithms, exchange nonces, and do a Diffie-Hellman exchange. Components Used The information in this document is based on these software and hardware versions: Internet Key Exchange Version 2 (IKEv2) Cisco IOS 15.1 (1)T or later The vulnerability is due to incorrect handling of crafted IKEv2 SA-Init packets. The difference between IKEv1 and IKEv2 is that, in the latter, the Child SAs are created as part of AUTH exchange itself. Can you also post the config for the VPN template. The Responder tunnel usually comes up before the Initiator. You wrote "had to change source interface to Service VPN". We may get it in march release if everything will be on track. Router2 sends out the responder message to Router 1. Cisco recommends that you have knowledge of the packet exchange for IKEv2. A Notify Payload may appear in a response message (usually specifying why a request was rejected), in an INFORMATIONAL Exchange (to report an error not in an IKE request), or in any other message to indicate sender capabilities or to modify the meaning of the request.If this CREATE_CHILD_SA exchange is rekeying an existing SA other than the IKE_SA, the leading N payload of type REKEY_SA MUST identify the SA being rekeyed. Source Interface in my setup is the WAN Interface connected to the Internet. All rights reserved. : crypto ikev2 profile default . #peer R3. It might be initiated by either end of the IKE_SA after the initial exchanges are completed. No action taken. description Cisco AnyConnect IKEv2 ip unnumbered GigabitEthernet0/0 tunnel mode ipsec ipv4 tunnel protection ipsec profile staff Take a break, you have now completed the main config on the router, and its time to move onto configuration relating to the client. Do you had to apply some NAT config? Learn more about how Cisco is using Inclusive Language. If the proposal is acceptable to the responder, it sends identical TS payloads back. No action taken. Customers Also Viewed These Support Documents, https://www.cisco.com/c/en/us/support/docs/security/flexvpn/115907-config-flexvpn-wcca-00.html. I followed the guide and created the IPSEC interface on the service side instead of VPN0, unfortunately I'm getting a IKEv2 failure: IKEv2:% Getting preshared key from profile keyring if-ipsec1-ikev2-keyringIKEv2:% Matched peer block 'if-ipsec1-ikev2-keyring-peer'IKEv2:(SESSION ID = 0,SA ID = 0):Searching Policy with fvrf 0, local address X.X.X.XIKEv2:(SESSION ID = 0,SA ID = 0):Found Policy 'policy1-global'IKEv2-ERROR:Address type 1622425149 not supported. If it guesses wrong, the CREATE_CHILD_SA exchange fails, and it will have to retry with a different KEi. Related Community Discussions View Bug Details in Bug Search Tool Why Is Login Required? To a remote end configured with encryption domains i wasnt sucessfull. Select the " Show Advanced Settings " option on the top left and make sure the enable box is checked. Responder initiates SA creation for that peer. This section lists the configurations used in this document. IKEv2 allows the security association to remain unchanged despite changes in the underlying connection. I also had to mention the same ACL in the local policy for this to work. Beginner. KEi (Key-optional): The CREATE_CHILD_SA request might optionally contain a KE payload for an additional DH exchange to enable stronger guarantees of forward secrecy for the CHILD_SA. The DH Group configured under the crypto map would be used only during rekey. Initiator building IKE_INIT_SA packet. Responder verifies and processes the IKE_INIT message: (1) Chooses crypto suite from those offered by the initiator, (2) computes its own DH secret key, and (3) it computes a skeyid value, from which all keys can be derived for this IKE_SA. Configure Phase 1 Settings For IKEv1. - edited Create an ACL in Policies > Local Policy > Access Control ListsPermit port 500I also have the Default Action as Accept in my POC.Copy the ACL name (CTRL C) youll need it for the next step. For more information, refer to IKEv2 Packet Exchange and Protocol Level Debugging. this is due to 4.9 a lot of hash/cryptography where removed! Following is the output of above router debug crypto ikev2: 189014: *Aug 8 14:01:22.145 Chicago: IKEv2:Received Packet [From 2.2.2.2:500/To 1.1.1.1:500/VRF i0:f0], Initiator SPI : 8A15E970577C6140 - Responder SPI : 0000000000000000 Message id: 0, SA KE N NOTIFY(REDIRECT_SUPPORTED) NOTIFY(NAT_DETECTION_SOURCE_IP) NOTIFY(NAT_DETECTION_DESTINATION_IP) NOTIFY(Unknown - 16430), 189015: *Aug 8 14:01:22.145 Chicago: IKEv2:(SESSION ID = 8673,SA ID = 1):Verify SA init message, 189016: *Aug 8 14:01:22.145 Chicago: IKEv2:(SESSION ID = 8673,SA ID = 1):Insert SA, 189017: *Aug 8 14:01:22.145 Chicago: IKEv2:Searching Policy with fvrf 0, local address 1.1.1.1, 189018: *Aug 8 14:01:22.145 Chicago: IKEv2:Found Policy 'ikev2policy', 189019: *Aug 8 14:01:22.145 Chicago: IKEv2:(SESSION ID = 8673,SA ID = 1):Processing IKE_SA_INIT message, 189020: *Aug 8 14:01:22.145 Chicago: IKEv2:(SA ID = 1):[IKEv2 -> PKI] Retrieve configured trustpoint(s), 189021: *Aug 8 14:01:22.145 Chicago: IKEv2:(SA ID = 1):[PKI -> IKEv2] Retrieved trustpoint(s): 'TP-self-signed-653483565', 189022: *Aug 8 14:01:22.145 Chicago: IKEv2:(SA ID = 1):[IKEv2 -> PKI] Get Public Key Hashes of trustpoints, 189023: *Aug 8 14:01:22.145 Chicago: IKEv2:(SA ID = 1):[PKI -> IKEv2] Getting of Public Key Hashes of trustpoints FAILED, 189024: *Aug 8 14:01:22.145 Chicago: IKEv2:Failed to retrieve Certificate Issuer list, 189025: *Aug 8 14:01:22.145 Chicago: IKEv2:(SESSION ID = 8673,SA ID = 1):[IKEv2 -> Crypto Engine] Computing DH public key, DH Group 14, 189026: *Aug 8 14:01:22.145 Chicago: IKEv2:(SA ID = 1):[Crypto Engine -> IKEv2] DH key Computation PASSED, 189027: *Aug 8 14:01:22.145 Chicago: IKEv2:(SESSION ID = 8673,SA ID = 1):Request queued for computation of DH key, 189028: *Aug 8 14:01:22.149 Chicago: IKEv2:(SESSION ID = 8673,SA ID = 1):[IKEv2 -> Crypto Engine] Computing DH secret key, DH Group 14, 189029: *Aug 8 14:01:22.149 Chicago: IKEv2:(SESSION ID = 8673,SA ID = 1):Request queued for computation of DH secret, 189030: *Aug 8 14:01:22.161 Chicago: IKEv2:(SA ID = 1):[Crypto Engine -> IKEv2] DH key Computation PASSED, 189031: *Aug 8 14:01:22.161 Chicago: IKEv2:(SA ID = 1):[IKEv2 -> Crypto Engine] Calculate SKEYSEED and create rekeyed IKEv2 SA, 189032: *Aug 8 14:01:22.161 Chicago: IKEv2:(SA ID = 1):[Crypto Engine -> IKEv2] SKEYSEED calculation and creation of rekeyed IKEv2 SA PASSED, 189033: *Aug 8 14:01:22.161 Chicago: IKEv2:IKEv2 responder - no config data to send in IKE_SA_INIT exch, 189034: *Aug 8 14:01:22.161 Chicago: IKEv2:(SESSION ID = 8673,SA ID = 1):Generating IKE_SA_INIT message. 2023 Cisco and/or its affiliates. 08-08-2018 This response packet contains: ISAKMP Header(SPI/ version/flags), IDr(responder's identity), AUTH payload, SAr2(initiates the SA-similar to the phase 2 transform set exchange in IKEv1), and TSi and TSr(Initiator and Responder Traffic selectors). If this CREATE_CHILD_SA exchange is not rekeying an existing SA, the N payload MUST be omitted. Edit your Feature Template for the VPN Interface Ethernet that is applied to your physical interface in VPN0.Under ACL/QOS add a IPv4 Ingress Access List using the name of the ACL you created in the first step. You can only use PSK when the client is another FlexVPN hardware (router) client or Strongswan. You can use IKEv2 as a virtual private network (VPN) tunneling protocol that supports automatic VPN reconnection. Update: This was a version error, using wrong version of anyconnect, this has now been resolved. Customers Also Viewed These Support Documents, Branch router, ISR4451-X, version 16.12.1b. Help would really be appreciated. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. 03-12-2019 I notice the guide was written for the vEdge. I'd like to configure a IPSEC tunnel to Zscaler, the interface should be sourced from VPN0 so that i can use the public IP address attached to my DIA circuit. All but the headers of all the messages that follow are encrypted and authenticated. 05-18-2021 12:04 PM. If this CREATE_CHILD_SA exchange is not rekeying an existing SA, the N payload must be omitted.