If a site-site VPN is not establishing successfully, you can debug it. This document assumes you have configured IPsec tunnel on ASA. WebHi, I need to identify the tunnel status is working perfectly from the logs of Router/ASA like from sh crypto isakmp sa , sh crypto ipsec sa, etc. You should see a status of "mm active" for all active tunnels. Phase 2 = "show crypto ipsec sa". I am curious how to check isakmp tunnel up time on router the way we can see on firewall. Find answers to your questions by entering keywords or phrases in the Search bar above. In other words it means how many times a VPN connection has been formed (even if you have configured only one) on the ASA since the last reboot or since the last reset of these statistics. You can naturally also use ASDM to check the Monitoring section and from there the VPN section. Need to check how many tunnels IPSEC are running over ASA 5520. Enter the show vpn-sessiondb command on the ASA for verification: Enter the show crypto session command on the IOS for verification: This section provides information that you can use in order to troubleshoot your configuration. Note:Refer to the Important Information on Debug Commands and IP Security Troubleshooting - Understanding and Using debug Commands Cisco documents before you use debug commands. View the Status of the Tunnels. This feature is enabled on Cisco IOS software devices by default, so the cert req type 12 is used by Cisco IOS software. You can do a "show crypto ipsec sa detail" and a "show crypto isakmp sa detail" both of them will give you the remaining time of the configured lifetime. Initiate VPN ike phase1 and phase2 SA manually. This document can be used to verify the status of an IPSEC tunnel, validate tunnel monitoring, clear the tunnel, and restore the tunnel. In order to do this, when you define the trustpoint under the crypto map add the chain keyword as shown here: crypto map outside-map 1 set trustpoint ios-ca chain. Phase 2 Verification. You can use a ping in order to verify basic connectivity. All rights reserved. Set Up Site-to-Site VPN. The documentation set for this product strives to use bias-free language. Data is transmitted securely using the IPSec SAs. The first thing to validate is that the route for the remote network is correct and pointing to the crypto map interface (typically the outside interface). Command show vpn-sessiondb license-summary, This command show vpn-sessiondb license-summary is use to see license details on ASA Firewall. ASA#show crypto ipsec sa peer [peer IP add] Display the PSK. So using the commands mentioned above you can easily verify whether or not an IPSec tunnel is active, down, or still negotiating. The identity NAT rule simply translates an address to the same address. show vpn-sessiondb ra-ikev1-ipsec. Details on that command usage are here. show vpn-sessiondb l2l. Certificate authentication requires that the clocks on alldevices used must be synchronized to a common source. NetFlow IOS Configuration Using CLI ASA , Router , Switches and Nexus, SITE TO SITE IPSEC VPN PHASE-1 AND PHASE-2 TROUBLESHOOTING STEPS, Wireless dBm Value Table - Wi-Fi Signal Strength Analysis with dBm, Cisco ASA IPsec VPN Troubleshooting Command - VPN Up time, Crypto,Ipsec, vpn-sessiondb, Crypto map and AM_ACTIVE. ASA-1 and ASA-2 are establishing IPSCE Tunnel. Edited for clarity. show vpn-sessiondb license-summary. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. For more information on CRL, refer to the What Is a CRL section of the Public Key Infrastructure Configuration Guide, Cisco IOS XE Release 3S. Both output wouldnt show anything if there was any active L2L VPN connections so the VPN listed by the second command is up. 01-07-2014 Details on that command usage are here. Some of the command formats depend on your ASA software level. Some of the command formats depend on your ASA software level, Hopefully the above information was helpfull, The field with "Connection: x.x.x.x" lists the remote VPN device IP address, The field with "Login Time" lists the time/date when the L2L VPN was formed, The field with "Duration" shows how long the L2L VPN has been up, Rest of the fields give information on the encryption, data transfered etc. show vpn-sessiondb detail l2l. In order to exempt that traffic, you must create an identity NAT rule. This command show run crypto mapis e use to see the crypto map list of existing Ipsec vpn tunnel. IPSec LAN-to-LAN Checker Tool. The expected peer ID is also configured manually in the same profile with the match identity remote command: On ASAs, the ISAKMP identity is selected globally with the crypto isakmp identity command: By default, the command mode is set to auto, which means that the ASA determines ISAKMP negotiation by connection type: Note: Cisco bug ID CSCul48099 is an enhancement request for the ability to configure on a per-tunnel-group basis rather than in the global configuration. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! If this is not done, then the the tunnel only gets negotiated as long as the ASA is the responder. In other words, have you configure the other ASA to tunnel all traffic through the L2L VPN? 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. 07-27-2017 03:32 AM. In order to configure a preshared authentication key, enter the crypto isakmp key command in global configuration mode: Use the extended or named access list in order to specify the traffic that should be protected by encryption. ASA-1 and ASA-2 are establishing IPSCE Tunnel. PAN-OS Administrators Guide. In order to automatically verify whether the IPSec LAN-to-LAN configuration between the ASA and IOS is valid, you can use the IPSec LAN-to-LAN Checker tool. NAC: Reval Int (T): 0 Seconds Reval Left(T): 0 Seconds SQ Int (T) : 0 Seconds EoU Age(T) : 4086 Seconds Hold Left (T): 0 Seconds Posture Token: What should i look for to confirm L2L state? Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. 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. The ASA supports IPsec on all interfaces. You must assign a crypto map set to each interface through which IPsec traffic flows. It's usually useful to narrow down the debug output first with "debug crypto condition peer " and then turn on debugging level 7 for Ipsec and isakmp: debug cry isa 7 (debug crypto ikev1 or ikev2 on 8.4(1) or later). Access control lists can be applied on a VTI interface to control traffic through VTI. show vpn-sessiondb summary. Many thanks for answering all my questions. The tool is designed so that it accepts a show tech or show running-config command from either an ASA or IOS router. One way is to display it with the specific peer ip. If this is not done, then the the tunnel only gets negotiated as long as the ASA is the responder. Miss the sysopt Command. To see details for a particular tunnel, try: show vpn-sessiondb l2l. Validation can be enabled or disabled on a per-tunnel-group basis with the peer-id-validate command: The difference in ID selection/validation causes two separate interoperability issues: When cert auth is used on the ASA, the ASA tries to validate the peer ID from the Subject Alternative Name (SAN) on the received certificate. If the traffic passes through the tunnel, you must see the encaps/decaps counters increment. This document can be used to verify the status of an IPSEC tunnel, validate tunnel monitoring, clear the tunnel, and restore the tunnel. You must assign a crypto map set to each interface through which IPsec traffic flows. The tool is designed so that it accepts a show tech or show running-config command from either an ASA or IOS router. An IKEv1 policy match exists when both of the policies from the two peers contain the same authentication, encryption, hash, and Diffie-Hellman parameter values. Phase 1 = "show crypto isakmp sa" or "show crypto ikev1 sa" or "show crypto ikev2 sa". Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Details on that command usage are here. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! A certificate revocation list (CRL) is a list of revoked certicates that have been issued and subsequently revoked by a given CA. New here? The ASA supports IPsec on all interfaces. If configured, it performs a multi-point check of the configuration and highlights any configuration errors and settings for the tunnel that would be negotiated. Ex. Configure tracker under the system block. 04:41 AM. Use the sysopt connection permit-ipsec command in IPsec configurations on the PIX in order to permit IPsec traffic to pass through the PIX Firewall without a check of conduit or access-list command statements.. By default, any inbound session must be explicitly permitted by a conduit or access-list command In order to troubleshoot IPSec IKEv1 tunnel negotiation on an IOS router, you can use these debug commands: Note: If the number of VPN tunnels on the IOS is significant, thedebug crypto condition peer ipv4 A.B.C.D should be used before you enable the debugs in order to limit the debug outputs to include only the specified peer. Similarly, by default the ASA selects the local ID automatically so, when cert auth is used, it sends the Distinguished Name (DN) as the identity. 01:20 PM If the traffic passes through the tunnel, you must see the encaps/decaps counters increment. access-list 101 permit ip 192.168.1.0 0.0.0.255 172.16.0.0 0.0.0.255. Hopefully the above information If software versions that do not have the fix for Cisco bug ID CSCul48246 are used on the ASA, then the HTTP-URL-based lookup is not negotiated on the ASA, and Cisco IOS software causes the authorization attempt to fail. For the scope of this post Router (Site1_RTR7200) is not used. If there are multiple VPN tunnels on the ASA, it is recommended to use conditional debugs (. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Next up we will look at debugging and troubleshooting IPSec VPNs. View the Status of the Tunnels. With a ping passing about the tunnel and the timer explired, the SA are renegotiated but the tunnel stay UP and the ping not losses any packet. This command Show vpn-sessiondb anyconnect command you can find both the username and the index number (established by the order of the client images) in the output of the show vpn-sessiondb anyconnect command. Can you please help me to understand this? This is the destination on the internet to which the router sends probes to determine the Here IP address 10.x is of this ASA or remote site? Hopefully the above information This document can also be used with these hardware and software versions: Configuration of an IKEv2 tunnel between an ASA and a router with the use of pre-shared keys is straightforward. New here? Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! I need to confirm if the tunnel is building up between 5505 and 5520? 06:02 PM. If the lifetimes are not identical, then the ASA uses the shorter lifetime. Establish a policy for the supported ISAKMP encryption, authentication Diffie-Hellman, lifetime, and key parameters. Note: On the router, a certificate map that is attached to the IKEv2 profile mustbe configured in order to recognize the DN. If the traffic passes through the tunnel, you must see the encaps/decaps counters increment. To permit any packets that come from an IPsec tunnel without checking ACLs for the source and destination interfaces, enter the sysopt connection permit-vpn command in global configuration mode. On the other side, when the lifetime of the SA is over, the tunnel goes down? To check if phase 2 ipsec tunnel is up: GUI: Navigate to Network->IPSec Tunnels GREEN indicates up RED indicates down. Establish a policy for the supported ISAKMP encryption, authentication Diffie-Hellman, lifetime, and key parameters. In order to configurethe IKEv1 transform set, enter the crypto ipsec ikev1 transform-set command: A crypto map defines an IPSec policy to be negotiated in the IPSec SA and includes: You can then apply the crypto map to the interface: Here is the final configuration on the ASA: If the IOS router interfaces are not yet configured, then at least the LAN and WAN interfaces should be configured. 07-27-2017 03:32 AM. The following command show run crypto ikev2 showing detailed information about IKE Policy. Deleted or updated broken links. ASA#more system:running-config | b tunnel-group [peer IP add] Display Uptime, etc. Use the sysopt connection permit-ipsec command in IPsec configurations on the PIX in order to permit IPsec traffic to pass through the PIX Firewall without a check of conduit or access-list command statements.. By default, any inbound session must be explicitly permitted by a conduit or access-list command Down The VPN tunnel is down. Also,If you do not specify a value for a given policy parameter, the default value is applied. An ACL for VPN traffic uses the source and destination IP addresses after Network Address Translation (NAT). NIce article sir, do you know how to check the tunnel for interesting traffic in CISCO ASA,, senario there are existing tunnel and need to determine whether they are in use or not as there are no owner so eventually need to decommission them but before that analysis is required, From syslog server i can only see up and down of tunnel. Hope this helps. You can do a "show crypto ipsec sa detail" and a "show crypto isakmp sa detail" both of them will give you the remaining time of the configured lifetime. endpoint-dns-name is the DNS name of the endpoint of the tunnel interface. 2023 Cisco and/or its affiliates. If the router is configured to receive the address as the remote ID, the peer ID validation fails on the router. If IKEv2 debugs are enabled on the router, these debugs appear: For this issue, either configure the router in order to validate the fully qualified domain name (FQDN) or configure the ASA in order to use address as the ISAKMP ID. To see details for a particular tunnel, try: If a site-site VPN is not establishing successfully, you can debug it. 2023 Cisco and/or its affiliates. Compromise of the key pair used by a certicate. Note:An IKEv1 policy match exists when both of the policies from the two peers contain the same authentication, encryption, hash, and Diffie-Hellman parameter values. ASA#show crypto isakmp sa detail | b [peer IP add] Check Phase 2 Tunnel. and it remained the same even when I shut down the WAN interafce of the router. ASA#more system:running-config | b tunnel-group [peer IP add] Display Uptime, etc. This section describes the commands that you can use on the ASA or IOS in order to verify the details for both Phases 1 and 2. ** Found in IKE phase I aggressive mode. An IKEv1 transform set is a combination of security protocols and algorithms that define the way that the ASA protects data. It examines the configuration and attempts to detect whether a crypto map based LAN-to-LAN IPSec tunnel is configured. The documentation set for this product strives to use bias-free language. Or does your Crypto ACL have destination as "any"? In order to automatically verify whether the IPSec LAN-to-LAN configuration between the ASA and IOS is valid, you can use the IPSec LAN-to-LAN Checker tool. Secondly, check the NAT statements. I used the following "show" commands, "show crypto isakmp sa" and "sh crypto ipsec sa" and below are their outputs: dst src state conn-id slot, 30.0.0.1 20.0.0.1 QM_IDLE 2 0, Crypto map tag: branch-map, local addr. New here? In order to configure the IKEv1 preshared key, enter the tunnel-group ipsec-attributes configuration mode: The ASA uses Access Control Lists (ACLs) in order to differentiate the traffic that should be protected with IPSec encryption from the traffic that does not require protection. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Resource Allocation in Multi-Context Mode on ASA, Validation of the Certificate Revocation List, Network Time Protocol: Best Practices White Paper, CLI Book 1: Cisco ASA Series General Operations CLI Configuration Guide, 9.8, Public Key Infrastructure Configuration Guide, Cisco IOS XE Release 3S, Certificates and Public Key Infrastructure (PKI), Cisco ASA 5506 Adaptive Security Appliance that runs software version 9.8.4, Cisco 2900 Series Integrated Services Router (ISR) that runs Cisco IOS software version 15.3(3)M1, Cisco ASA that runs software version 8.4(1) orlater, Cisco ISR Generation 2 (G2) that runs Cisco IOS software version 15.2(4)M or later, Cisco ASR 1000 Series Aggregation Services Routers that run Cisco IOS-XE software version 15.2(4)S or later, Cisco Connected Grid Routers that run software version 15.2(4)M or later. This command show crypto IPsec sa shows IPsec SAs built between peers. Where the log messages eventually end up depends on how syslog is configured on your system. There is a global list of ISAKMP policies, each identified by sequence number. Find answers to your questions by entering keywords or phrases in the Search bar above. Start / Stop / Status:$ sudo ipsec up , Get the Policies and States of the IPsec Tunnel:$ sudo ip xfrm state, Reload the secrets, while the service is running:$ sudo ipsec rereadsecrets, Check if traffic flows through the tunnel:$ sudo tcpdump esp. In this post, we are providing insight on Cisco ASA Firewall command which would help to troubleshoot IPsec vpn issue and how to gather relevant details aboutIPsec tunnel. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. 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. Even if we dont configure certain parameters at initial configuration, Cisco ASA sets its default settings for dh group2, prf (sha) and SA lifetime (86400 seconds). show vpn-sessiondb license-summary. Updated to remove PII, title correction, introduction length, machine translation, style requirements, gerunds and formatting. any command? Common places are/var/log/daemon, /var/log/syslog, or /var/log/messages. The router does this by default. 03-11-2019 If there is some problems they are probably related to some other configurations on the ASAs. Secondly, check the NAT statements. To see details for a particular tunnel, try: show vpn-sessiondb l2l. If you change the debug level, the verbosity of the debugs canincrease. show crypto ipsec client ezvpn should show a state of IPSEC ACTIVE; If the VPN tunnel is not up, issue a ping to AD1 sourced from VLAN 10. The DH Group configured under the crypto map is used only during a rekey. In order to do this, when you define the trustpoint under the crypto map add the chain keyword as shown here: crypto map outside-map 1 set trustpoint ios-ca chain. Customers Also Viewed These Support Documents. 05:44 PM. This procedure verifies phase 1 activity: This procedure describes how to verify if the Security Parameter Index (SPI) has been negotiated correctly on the two peers: This procedure describes how to confirm whether traffic flows across the tunnel: This section provides information you can use in order to troubleshoot your configuration. This synchronization allows events to be correlated when system logs are created and when other time-specific events occur. If the lifetimes are not identical, then the ASA uses a shorter lifetime. Note: For each ACL entry there is a separate inbound/outbound SA created, which might result in a long show crypto ipsec sa command output (dependent upon the number of ACE entries in the crypto ACL). The router does this by default. In order to enable IKEv1, enter the crypto ikev1 enable command in global configuration mode: For a LAN-to-LAN tunnel, the connection profile type is ipsec-l2l. Hi guys, I am curious how to check isakmp tunnel up time on router the way we can see on firewall. ASA#show crypto isakmp sa detail | b [peer IP add] Check Phase 2 Tunnel. will show the status of the tunnels ( command reference ). When i do sh crypto isakmp sa on 5505 it shows peer tunnel IP but state is MM_ACTIVE. show crypto ipsec sa detailshow crypto ipsec sa. Ex. So we can say currently it has only 1 Active IPSEC VPN right? In order to do this, when you define the trustpoint under the crypto map add the chain keyword as shown here: If this is not done, then the the tunnel only gets negotiated as long as the ASA is the responder. 01-08-2013 Regards, Nitin Note:If there is a need to add a new subnet to the protected traffic, simply add a subnet/host to the respective object-group and complete a mirror change on the remote VPN peer. Some of the command formats depend on your ASA software level. The router does this by default. Updated device and software under Components Used. Ensure that the NAT (or noNAT) statement is not being masked by any other NAT statement. will show the status of the tunnels ( command reference ). WebTo configure the IPSec VPN tunnel on Cisco ASA 55xx firewall running version 9.6: 1. EDIT: And yes, there is only 1 Active VPN connection when you issued that command on your firewall. In order to verify whether IKEv1 Phase 2 is up on the ASA, enter the show crypto ipsec sa command. When the IKE negotiation begins, it attempts to find a common policy that is configured on both of the peers, and it starts with the highest priority policies that are specified on the remote peer. I would try the following commands to determine better the L2L VPN state/situation, You can naturally also use ASDM to check the Monitoring section and from there the VPN section. Customers Also Viewed These Support Documents. Customers Also Viewed These Support Documents. To confirm data is actually sent and received over the VPN, check the output of "show crypto ipsec sa" and confirm the counters for encaps|decaps are increasing. Complete these steps in order to set up the site-to-site VPN tunnel via the ASDM wizard: Open the ASDM and navigate to Wizards > VPN Wizards > Site-to-site VPN Wizard: Click Next once you reach the wizard home page: Note: The most recent ASDM versions provide a link to a video that explains this configuration. You must assign a crypto map set to each interface through which IPsec traffic flows. Learn more about how Cisco is using Inclusive Language. private subnet behind the strongSwan, expressed as network/netmask. During IPSec Security Association (SA) negotiations, the peers must identify a transform set or proposal that is the same for both of the peers. WebTo configure the IPSec VPN tunnel on Cisco ASA 55xx firewall running version 9.6: 1. When the life time finish the tunnel is retablished causing a cut on it? If you change the debug level, the verbosity of the debugs can increase. If the lifetimes are not identical, then the ASA uses a shorter lifetime. The expected output is to see theMM_ACTIVEstate: In order to verify whether IKEv1 Phase 2 is up on the ASA, enter theshow crypto ipsec sacommand. The tool is designed so that it accepts a show tech or show running-config command from either an ASA or IOS router. Is there any similiar command such as "show vpn-sessiondb l2l" on the router? endpoint-dns-name is the DNS name of the endpoint of the tunnel interface. Set Up Tunnel Monitoring. To confirm data is actually sent and received over the VPN, check the output of "show crypto ipsec sa" and confirm the counters for encaps|decaps are increasing. However, I wanted to know what was the appropriate "Sh" commands i coud use to confirm the same. Phase 1 = "show crypto isakmp sa" or "show crypto ikev1 sa" or "show crypto ikev2 sa". Both peers authenticate each other with a Pre-shared-key (PSK). Is there any other command that I am missing??". To see details for a particular tunnel, try: show vpn-sessiondb l2l. Next up we will look at debugging and troubleshooting IPSec VPNs.