Also want to see the pre-shared-key of vpn tunnel. access-list 101 permit ip 192.168.1.0 0.0.0.255 172.16.0.0 0.0.0.255. New here? Tip: When a Cisco IOS software Certificate Authority (CA) server is used, it is common practice to configure the same device as the NTP server. All rights reserved. - edited If there is some problems they are probably related to some other configurations on the ASAs. I mean the local/remote network pairs. When IKEv2 tunnels are used on routers, the local identity used in the negotiation is determined by the identity local command under the IKEv2 profile: By default, the router uses the address as the local identity. Failure or compromise of a device that usesa given certificate. This document describes common Cisco ASA commands used to troubleshoot IPsec issue. You must assign a crypto map set to each interface through which IPsec traffic flows. - edited Here IP address 10.x is of this ASA or remote site? Next up we will look at debugging and troubleshooting IPSec VPNs. How to check IPSEC VPN is up or not via cisco asdm for particular client, Customers Also Viewed These Support Documents. WebThe following is sample output from the show vpn-sessiondb detail l2l command, showing detailed information about LAN-to-LAN sessions: The command show vpn-sessiondb detail l2l provide details of vpn tunnel up time, Receiving and transfer Data Cisco-ASA# sh vpn-sessiondb l2l Session Type: LAN-to-LAN Connection : 212.25.140.19 Index : 17527 IP You can naturally also use ASDM to check the Monitoring section and from there the VPN section. Ex. Here is an example: Note:You can configure multiple IKE policies on each peer that participates in IPSec. Find answers to your questions by entering keywords or phrases in the Search bar above. Customers Also Viewed These Support Documents. 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. To see details for a particular tunnel, try: show vpn-sessiondb l2l. Check Phase 1 Tunnel. Cisco recommends that you have knowledge of these topics: 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. This section describes how to complete the ASA and IOS router CLI configurations. In General show running-config command hide encrypted keys and parameters. There is a global list of ISAKMP policies, each identified by sequence number. Cert Distinguished Name for certificate authentication. However, I wanted to know what was the appropriate "Sh" commands i coud use to confirm the same. Ensure that the NAT (or noNAT) statement is not being masked by any other NAT statement. Check Phase 1 Tunnel. * Found in IKE phase I main mode. 11-01-2017 VPNs. 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. There is a global list of ISAKMP policies, each identified by sequence number. 04-17-2009 07:07 AM. This is the destination on the internet to which the router sends probes to determine the 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. EDIT: And yes, there is only 1 Active VPN connection when you issued that command on your firewall. 03:54 PM In order to exempt that traffic, you must create an identity NAT rule. Connection : 10.x.x.x.Index : 3 IP Addr : 10..x.x.xProtocol : IKE IPsecEncryption : AES256 Hashing : SHA1Bytes Tx : 3902114912 Bytes Rx : 4164563005Login Time : 21:10:24 UTC Sun Dec 16 2012Duration : 22d 18h:55m:43s. Network 1 and 2 are at different locations in same site. In order to troubleshoot IPSec IKEv1 tunnel negotiation on an ASA firewall, you can use thesedebugcommands: Caution: On the ASA, you can set various debug levels; by default, level 1 is used. In other words, have you configure the other ASA to tunnel all traffic through the L2L VPN? Also,If you do not specify a value for a given policy parameter, the default value is applied. To see details for a particular tunnel, try: show vpn-sessiondb l2l. If this is not done, then the the tunnel only gets negotiated as long as the ASA is the responder. Down The VPN tunnel is down. Before you verify whether the tunnel is up and that it passes the traffic, you must ensure that the 'traffic of interest' is sent towards either the ASA or the strongSwan server. Both peers authenticate each other with a Pre-shared-key (PSK). Please try to use the following commands. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. I tried Monitoring-->VPN Statistics--> Session--->Filtered By---> IPSec Site-to-site. In case you need to check the SA timers for Phase 1 and Phase 2. ASA#more system:running-config | b tunnel-group [peer IP add] Display Uptime, etc. Details on that command usage are here. private subnet behind the strongSwan, expressed as network/netmask. ASA#show crypto isakmp sa detail | b [peer IP add] Check Phase 2 Tunnel. Two Sites (Site1 and Site-2) can communicate with each other by using ASA as gateway through a common Internet Service Provider Router (ISP_RTR7200). So seems to me that your VPN is up and working. Phase 2 = "show crypto ipsec sa". Down The VPN tunnel is down. I will use the above commands and will update you. BGP Attributes - Path Selection algorithm -BGP Attributes influence inbound and outbound traffic policy. Assigning the crypto map set to an interface instructs the ASA to evaluate all the traffic against the crypto map set and to use the specified policy during connection or SA negotiation. To check if phase 2 ipsec tunnel is up: GUI: Navigate to Network->IPSec Tunnels GREEN indicates up RED indicates down. The expected output is to see both the inbound and outbound SPI. Deleted or updated broken links. You might have to use a drop down menu in the actual VPN page to select Site to Site VPN / L2L VPN show you can list the L2L VPN connections possibly active on the ASA. This document describes how to configure Site-to-Site IPSec Internet Key Exchange Version 1 tunnel via the CLI between an ASA and a strongSwan server. Is there any way to check on 7200 series router. This document describes how to configure a site-to-site (LAN-to-LAN) IPSec Internet Key Exchange Version 1 (IKEv1) tunnel via the CLI between a Cisco Adaptive Security Appliance (ASA) and a router that runs Cisco IOS software. In your case the above output would mean that L2L VPN type connection has been formed 3 times since the last reboot or clearing of these statistics. If the lifetimes are not identical, then the ASA uses a shorter lifetime. Learn more about how Cisco is using Inclusive Language. 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. Next up we will look at debugging and troubleshooting IPSec VPNs. The first output shows the formed IPsec SAs for the L2L VPN connection. 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. 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. This command show the output such as the #pkts encaps/encrypt/decap/decrypt, these numbers tell us how many packets have actually traversed the IPsec tunnel and also verifies we are receiving traffic back from the remote end of the VPN tunnel. Two Sites (Site1 and Site-2) can communicate with each other by using ASA as gateway through a common Internet Service Provider Router (ISP_RTR7200). 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. The router does this by default. For IKEv1, the remote peer policy must also specify a lifetime less than or equal to the lifetime in the policy that the initiator sends. If this is not done, then the the tunnel only gets negotiated as long as the ASA is the responder. show vpn-sessiondb ra-ikev1-ipsec. Typically, there should be no NAT performed on the VPN traffic. All of the devices used in this document started with a cleared (default) configuration. You should see a status of "mm active" for all active tunnels. An encrypted tunnel is built between 68.187.2.212 and 212.25.140.19. endpoint-dns-name is the DNS name of the endpoint of the tunnel interface. Certificate lookup based on the HTTP URL avoids the fragmentation that results when large certificates are transferred. show crypto isakmp sa. In order to exempt that traffic, you must create an identity NAT rule. ASA#more system:running-config | b tunnel-group [peer IP add] Display Uptime, etc. By default the router has 3600 seconds as lifetime for ipsec and 86400 seconds for IKE. With IKEv1, you see a different behavior because Child SA creation happens during Quick Mode, and the CREATE_CHILD_SA message has the provision tocarry the Key Exchange payload, which specifies the DH parameters to derive the new shared secret. The expected output is to see the ACTIVE state: In order to verify whether IKEv1 Phase 2 is up on the ASA, enter theshow crypto ipsec sa command. You must assign a crypto map set to each interface through which IPsec traffic flows. Down The VPN tunnel is down. Customers Also Viewed These Support Documents. 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. Certicates canbe revoked for a number of reasons such as: The mechanism used for certicate revocation depends on the CA. Need to understand what does cumulative and peak mean here? 01-08-2013 The tool is designed so that it accepts a show tech or show running-config command from either an ASA or IOS router. In order for the crypto map entry to be complete, there are some aspects that must be defined at a minimum: The final step is to apply the previously defined crypto map set to an interface. Cisco recommends that you have knowledge of these topics: The information in this document is based on these versions: The information in this document was created from the devices in a specific lab environment. Learn more about how Cisco is using Inclusive Language. ASA#show crypto ipsec sa peer [peer IP add] Display the PSK. This document can be used to verify the status of an IPSEC tunnel, validate tunnel monitoring, clear the tunnel, and restore the tunnel. Tip: Refer to the Most Common L2L and Remote Access IPSec VPN Troubleshooting Solutions Cisco document for more information about how to troubleshoot a site-to-site VPN. These commands work on both ASAs and routers: Note: In this output, unlike in IKEv1, the Perfect Forwarding Secrecy (PFS) Diffie-Hellman (DH) group value displays as 'PFS (Y/N): N, DH group: none' during the first tunnel negotiation; after a rekey occurs, the correct values appear. 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. Hopefully the above information In order to troubleshoot IPSec IKEv1 tunnel negotiation on an ASA firewall, you can use these debug commands: Note: If the number of VPN tunnels on the ASA is significant, thedebug crypto condition peer A.B.C.D command should be used before you enable the debugs in order to limit the debug outputs to include only the specified peer. You should see a status of "mm active" for all active tunnels. Set Up Site-to-Site VPN. You can naturally also use ASDM to check the Monitoring section and from there the VPN section. New here? The documentation set for this product strives to use bias-free language. 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. 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. However, when you use certificate authentication, there are certain caveats to keep in mind. Need to check how many tunnels IPSEC are running over ASA 5520. Next up we will look at debugging and troubleshooting IPSec VPNs. I configured the Cisco IPSec VPN from cisco gui in asa, however, i would like to know, how to check whether the vpn is up or not via gui for [particular customer. If the tunnel does not comeup because of the size of the auth payload, the usual causes are: As of ASA version 9.0, the ASA supports a VPN in multi-context mode. It also lists the packet counters which in your situation seem to indicate traffic is flowing in both directions. If a site-site VPN is not establishing successfully, you can debug it. You can use a ping in order to verify basic connectivity. In order to verify whether IKEv1 Phase 2 is up on the IOS, enter theshow crypto ipsec sa command. 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. Download PDF. ** Found in IKE phase I aggressive mode. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. : 30.0.0.1, path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0/1, slot: 0, conn id: 2002, flow_id: 3, crypto map: branch-map, sa timing: remaining key lifetime (k/sec): (4553941/2400), slot: 0, conn id: 2003, flow_id: 4, crypto map: branch-map, sa timing: remaining key lifetime (k/sec): (4553941/2398). If the traffic passes through the tunnel, you should see the encaps/decaps counters increment. show vpn-sessiondb l2l. will show the status of the tunnels ( command reference ). Configure IKE. Note:If you do not specify a value for a given policy parameter, the default value is applied. I am sure this would be a piece of cake for those acquinted with VPNs. Are you using Easy VPN or something because it says that the remote address is 0.0.0.0/0 ? show vpn-sessiondb summary. I configured the Cisco IPSec VPN from cisco gui in asa, however, i would like to know, how to check whether the vpn is up or not via gui for [particular customer. If you shut down the WAN interface, the isakmp phase I and Phase II will remains until rekey is happening. - edited Could you please list down the commands to verify the status and in-depth details of each command output ?. Phase 2 Verification. Thank you in advance. Note:On the ASA, the packet-tracer tool that matches the traffic of interest can be used in order to initiate the IPSec tunnel (such as packet-tracer input inside tcp 10.10.10.10 12345 10.20.10.10 80 detailed for example). Details on that command usage are here. 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. It examines the configuration and attempts to detect whether a crypto map based LAN-to-LAN IPSec tunnel is configured. The easiest method to synchronize the clocks on all devices is to use NTP. If you are looking at flushing the tunnel when the interface goes down then you have to enable keepalives. show vpn-sessiondb license-summary. So using the commands mentioned above you can easily verify whether or not an IPSec tunnel is active, down, or still negotiating. WebUse the following commands to verify the state of the VPN tunnel: show crypto isakmp sa should show a state of QM_IDLE. Can you please help me to understand this? Here is an example: Note:An ACL for VPN traffic uses the source and destination IP addresses after NAT. access-list 101 permit ip 192.168.1.0 0.0.0.255 172.16.0.0 0.0.0.255. This feature is enabled on Cisco IOS software devices by default, so the cert req type 12 is used by Cisco IOS software. If the lifetimes are not identical, then the ASA uses the shorter lifetime. Common places are, IKEv1/IKEv2 Between Cisco IOS and strongSwan Configuration Example, Configure a Site-to-Site IPSec IKEv1 Tunnel Between an ASA and a Cisco IOS Router. 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. In order to go to internet both of the above networks have L2L tunnel from their ASA 5505 to ASA 5520. and try other forms of the connection with "show vpn-sessiondb ?" ASA#show crypto ipsec sa peer [peer IP add] Display the PSK. 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. Or does your Crypto ACL have destination as "any"? 03-11-2019 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. 2023 Cisco and/or its affiliates. Compromise of the key pair used by a certicate. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. If the traffic passes through the tunnel, you must see the encaps/decaps counters increment. The expected output is to see both the inbound and outbound Security Parameter Index (SPI). The expected output is to see both the inbound and outbound Security Parameter Index (SPI). Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Well, aside from traffic passing successfully through the new tunnels, the command: will show the status of the tunnels (command reference). To check if phase 2 ipsec tunnel is up: GUI: Navigate to Network->IPSec Tunnels GREEN indicates up RED indicates down. 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. If certificates (rather than pre-shared keys) are used for authentication, the auth payloads are considerably larger. 03-12-2019 Note: On the router, a certificate map that is attached to the IKEv2 profile mustbe configured in order to recognize the DN. Thank you in advance. You might have to use a drop down menu in the actual VPN page to select Site to Site VPN / L2L VPN show you can list the L2L VPN connections possibly active on the ASA. Web0. : 20.0.0.1, remote crypto endpt. This is the destination on the internet to which the router sends probes to determine the 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. : 10.31.2.30/0 path mtu 1500, ipsec overhead 74(44), media mtu 1500 PMTU time remaining (sec): 0, DF policy: copy-df ICMP error validation: disabled, TFC packets: disabled current outbound spi: 06DFBB67 current inbound spi : 09900545, inbound esp sas: spi: 0x09900545 (160433477) transform: esp-aes-256 esp-sha-hmac no compression in use settings ={L2L, Tunnel, IKEv1, } slot: 0, conn_id: 12288, crypto-map: COMMC_Traffic_Crypto sa timing: remaining key lifetime (kB/sec): (3914702/24743) IV size: 16 bytes replay detection support: Y Anti replay bitmap: 0xFFFFFFFF 0xFFFFFFFF outbound esp sas: spi: 0x06DFBB67 (115325799) transform: esp-aes-256 esp-sha-hmac no compression in use settings ={L2L, Tunnel, IKEv1, } slot: 0, conn_id: 12288, crypto-map: COMMC_Traffic_Crypto sa timing: remaining key lifetime (kB/sec): (3914930/24743) IV size: 16 bytes replay detection support: Y Anti replay bitmap: 0x00000000 0x00000001, Connection : 10.31.2.30Index : 3 IP Addr : 10.31.2.30Protocol : IKEv1 IPsecEncryption : IKEv1: (1)AES256 IPsec: (1)AES256Hashing : IKEv1: (1)SHA1 IPsec: (1)SHA1Bytes Tx : 71301 Bytes Rx : 305820Login Time : 11:59:24 UTC Tue Jan 7 2014Duration : 1h:07m:54sIKEv1 Tunnels: 1IPsec Tunnels: 1. * Found in IKE phase I main mode. Ensure that the NAT (or noNAT) statement is not being masked by any other NAT statement. New here? Establish a policy for the supported ISAKMP encryption, authentication Diffie-Hellman, lifetime, and key parameters. Tried commands which we use on Routers no luck. Access control lists can be applied on a VTI interface to control traffic through VTI. show vpn-sessiondb summary. New here? Miss the sysopt Command. Can you please help me to understand this? Is there any other command that I am missing?? 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. WebTo configure the IPSec VPN tunnel on Cisco ASA 55xx firewall running version 9.6: 1. In order to specify the transform sets that can be used with the crypto map entry, enter the, The traffic that should be protected must be defined. Two Sites (Site1 and Site-2) can communicate with each other by using ASA as gateway through a common Internet Service Provider Router (ISP_RTR7200). This will also tell us the local and remote SPI, transform-set, DH group, & the tunnel mode for IPsec SA. The tool is designed so that it accepts a show tech or show running-config command from either an ASA or IOS router. In order to configure the Internet Security Association and Key Management Protocol (ISAKMP) policies for the IKEv1 connections, enter the crypto ikev1 policy command: 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. show vpn-sessiondb summary. Phase 2 = "show crypto ipsec sa". 04:12 PM. Remote ID validation is done automatically (determined by the connection type) and cannot be changed. This is not a bug, but is expected behavior.The difference between IKEv1 and IKEv2 is that, in IKEv2, the Child SAs are created as part of the AUTH exchange itself. Hi guys, I am curious how to check isakmp tunnel up time on router the way we can see on firewall. This is the destination on the internet to which the router sends probes to determine the If the router is configured to receive the address as the remote ID, the peer ID validation fails on the router. In other words, have you configure the other ASA to tunnel all traffic through the L2L VPN? Data is transmitted securely using the IPSec SAs. Secondly, check the NAT statements. ASA-1 and ASA-2 are establishing IPSCE Tunnel. failed: 0, #pkts not decompressed: 0, #pkts decompress failed: 0, local crypto endpt. 01:20 PM How can i check this on the 5520 ASA ? 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. 08:26 PM, I have new setup where 2 different networks. All of the devices used in this document started with a cleared (default) configuration. Configure tracker under the system block. All rights reserved. : 10.31.2.19/0, remote crypto endpt. The ASA supports IPsec on all interfaces. WebUse the following commands to verify the state of the VPN tunnel: show crypto isakmp sa should show a state of QM_IDLE. Configure IKE. show vpn-sessiondb detail l2l. The good thing is that it seems to be working as I can ping the other end (router B) LAN's interface using the source as LAN interface of this router (router A). If the traffic passes through the tunnel, you must see the encaps/decaps counters increment. Is there any other command that I am missing??". If it is an initiator, the tunnel negotiation fails and PKI and IKEv2 debugs on the router show this: Use this section in order to confirm that your configuration works properly. This command show crypto IPsec sa shows IPsec SAs built between peers. This usually results in fragmentation, which can then cause the authentication to fail if a fragment is lost or dropped in the path. Therefore, if CRL validation is enabled on either peer, a proper CRL URL must be configured as well so the validity of the ID certificates can be verified.