In order to verify whether IKEv1 Phase 2 is up on the ASA, enter the show crypto ipsec sa command. 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. The documentation set for this product strives to use bias-free language. At that stage, after retransmitting packets and then we will flush the phase I and the Phase II. So using the commands mentioned above you can easily verify whether or not an IPSec tunnel is active, down, or still negotiating. "show crypto session " should show this information: Not 100% sure for the 7200 series, butin IOS I can use. 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 VPNs. If the router is configured to receive the address as the remote ID, the peer ID validation fails on the router. show vpn-sessiondb detail l2l. How can i check this on the 5520 ASA ? It depends if traffic is passing through the tunnel or not. At both of the above networks PC connected to switch gets IP from ASA 5505. Here IP address 10.x is of this ASA or remote site? Hope this helps. 04-17-2009 07:07 AM. Find answers to your questions by entering keywords or phrases in the Search bar above. How to know Site to Site VPN up or Down st. Customers Also Viewed These Support Documents. show crypto isakmp sa. Details 1. The good thing is that i can ping the other end of the tunnel which is great. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. On the other side, when the lifetime of the SA is over, the tunnel goes down? ASA-1 and ASA-2 are establishing IPSCE Tunnel. Learn more about how Cisco is using Inclusive Language. The output you are looking at is of Phase 1 which states that Main Mode is used and the Phase 1 seems to be fine. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. 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. All rights reserved. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! 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. Down The VPN tunnel is down. Establish a policy for the supported ISAKMP encryption, authentication Diffie-Hellman, lifetime, and key parameters. In order to specify an IPSec peer in a crypto map entry, enter the, The transform sets that are acceptable for use with the protected traffic must be defined. Configure IKE. 05-01-2012 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. 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. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. EDIT: And yes, there is only 1 Active VPN connection when you issued that command on your firewall. It also lists the packet counters which in your situation seem to indicate traffic is flowing in both directions. I suppose that when I type the commandsh cry sess remote , detailed "uptime" means that the tunnel is established that period of time and there were no downs. 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. In order to verify whether IKEv1 Phase 2 is up on the IOS, enter theshow crypto ipsec sa command. 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. If a site-site VPN is not establishing successfully, you can debug it. One way is to display it with the specific peer ip. * Found in IKE phase I main mode. To check if phase 2 ipsec tunnel is up: GUI: Navigate to Network->IPSec Tunnels GREEN indicates up RED indicates down. the "QM_idle", will remain idle for until security association expires, after which it will go to "deleted state". 05:17 AM You can naturally also use ASDM to check the Monitoring section and from there the VPN section. sh cry sess remote , detailed "uptime" means that the tunnel is established that period of time and there were no downs. I will use the above commands and will update you. Typically, there should be no NAT performed on the VPN traffic. Certificate authentication requires that the clocks on alldevices used must be synchronized to a common source. 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). will show the status of the tunnels ( command reference ). You must enable IKEv1 on the interface that terminates the VPN tunnel. You can for example have only one L2L VPN configured and when it comes up, goes down and comes up again it will already give the Cumulative value of 2. In this example, the CA server also serves as the NTP server. sh crypto ipsec sa peer 10.31.2.30peer address: 10.31.2.30 Crypto map tag: COMMC_Traffic_Crypto, seq num: 1, local addr: 10.31.2.19, access-list XC_Traffic extended permit ip 192.168.2.128 255.255.255.192 any local ident (addr/mask/prot/port): (192.168.2.128/255.255.255.192/0/0) remote ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0) current_peer: 10.31.2.30, #pkts encaps: 1066, #pkts encrypt: 1066, #pkts digest: 1066 #pkts decaps: 3611, #pkts decrypt: 3611, #pkts verify: 3611 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 1066, #pkts comp failed: 0, #pkts decomp failed: 0 #pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0 #PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0 #TFC rcvd: 0, #TFC sent: 0 #Valid ICMP Errors rcvd: 0, #Invalid ICMP Errors rcvd: 0 #send errors: 0, #recv errors: 0, local crypto endpt. 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. This synchronization allows events to be correlated when system logs are created and when other time-specific events occur. This traffic needs to be encrypted and sent over an Internet Key Exchange Version 1 (IKEv1) tunnel between ASA and stongSwan server. Learn more about how Cisco is using Inclusive Language. If the lifetimes are not identical, then the ASA uses a shorter lifetime. 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. 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. 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. The 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. 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. Ensure that the NAT (or noNAT) statement is not being masked by any other NAT statement. WebUse the following commands to verify the state of the VPN tunnel: show crypto isakmp sa should show a state of QM_IDLE. Next up we will look at debugging and troubleshooting IPSec VPNs. ** Found in IKE phase I aggressive mode. You can naturally also use ASDM to check the Monitoring section and from there the VPN section. BGP Attributes Path Selection algorithm -BGP Attributes influence inbound and outbound traffic policy. show vpn-sessiondb license-summary. In order to exempt that traffic, you must create an identity NAT rule. 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. 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. This will also tell us the local and remote SPI, transform-set, DH group, & the tunnel mode for IPsec SA. show vpn-sessiondb license-summary. You must assign a crypto map set to each interface through which IPsec traffic flows. In order to apply this, enter the crypto map interface configuration command: Here is the final IOS router CLI configuration: 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 IOS router. Miss the sysopt Command. By default the router has 3600 seconds as lifetime for ipsec and 86400 seconds for IKE. 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). If the lifetimes are not identical, then the ASA uses the shorter lifetime. Download PDF. 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. 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. This document can be used to verify the status of an IPSEC tunnel, validate tunnel monitoring, clear the tunnel, and restore the tunnel. If the traffic passes through the tunnel, you must see the encaps/decaps counters increment. Phase 2 = "show crypto ipsec sa". Check Phase 1 Tunnel. Download PDF. 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. Hope this helps. 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. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! This command show crypto IPsec sa shows IPsec SAs built between peers. One way is to display it with the specific peer ip. Or does your Crypto ACL have destination as "any"? Then introduce interesting traffic and watch the output for details. Some of the command formats depend on your ASA software level. 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. Alternatively, you can make use of the commandshow vpn-sessiondbtoverify the details for both Phases 1 and 2, together. 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, In order to verify whether IKEv1 Phase 2 is up on the ASA, enter the. 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. For the scope of this post Router (Site1_RTR7200) is not used. Ex. The expected output is to see both the inbound and outbound Security Parameter Index (SPI). All rights reserved. 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. The first output shows the formed IPsec SAs for the L2L VPN connection. Note: Refer to Important Information on Debug Commands before you use debug commands. You can naturally also use ASDM to check the Monitoring section and from there the VPN section. 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. - edited 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 On the ASA, if IKEv2 protocol debugs are enabled, these messages appear: In order to avoid this issue, use the no crypto ikev2 http-url cert command in order to disable this feature on the router when it peers with an ASA. 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. However, when you use certificate authentication, there are certain caveats to keep in mind. One way is to display it with the specific peer ip. You should see a status of "mm active" for all active tunnels. show vpn-sessiondb l2l. If the ASA is configured with a certificate that has Intermediate CAs and its peer doesnot have the same Intermediate CA, then the ASA needs to be explicitly configured to send the complete certificate chain to the router. Down The VPN tunnel is down. If this is not done, then the the tunnel only gets negotiated as long as the ASA is the responder. Also want to see the pre-shared-key of vpn tunnel. show crypto ipsec sa detailshow crypto ipsec sa. Also,If you do not specify a value for a given policy parameter, the default value is applied. Web0. Phase 2 = "show crypto ipsec sa". 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. So seems to me that your VPN is up and working. A certificate revocation list (CRL) is a list of revoked certicates that have been issued and subsequently revoked by a given CA. If the lifetimes are not identical, then the ASA uses a shorter lifetime. 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. However, I wanted to know what was the appropriate "Sh" commands i coud use to confirm the same.