This document assumes you have configured IPsec. It contains a checklist of common procedures that you might try before you begin to troubleshoot a connection and call Cisco Technical Support. Triple DES is available on the Cisco series and later.
PIX —V5. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration.
If your network is live, make sure that you understand the potential impact of any command. Refer to Cisco Technical Tips Conventions for more information on document conventions. This command shows IPsec SAs built between peers. The encrypted tunnel is built between This command shows each phase 2 SA built and the amount of traffic sent. Since phase 2 security associations SAs are unidirectional, each SA shows traffic in only one direction encryptions are outbound, decryptions are inbound.
This command shows the source and destination of IPsec tunnel endpoints. Two "sa created" messages appear with one in each direction. This error is a result of reordering in transmission medium especially if parallel paths existor unequal paths of packet processing inside Cisco IOS for large versus small packets plus under load. Change the transform-set to reflect this. The reply check is only seen when transform-set esp-md5-hmac is enabled.
In order to surpress this error message, disable esp-md5-hmac and do encryption only. One possible reason is the proxy identities, such as interesting traffic, access control list ACL or crypto ACL, do not match on both the ends. Check the configuration on both the devices, and make sure that the crypto ACLs match. Another possible reason is mismatching of the transform set parameters.
Make sure that at both ends, VPN gateways use the same transform set with the exact same parameters. The crypto map map-name local-address interface-id command causes the router to use an incorrect address as the identity because it forces the router to use a specified address.
Crypto map is applied to the wrong interface or is not applied at all. Check the configuration in order to ensure that crypto map is applied to the correct interface. This debug error appears if the pre-shared keys on the peers do not match. In order to fix this issue, check the pre-shared keys on both sides. This is an example of the Main Mode error message. The failure of main mode suggests that the phase 1 policy does not match on both sides.
This also means that main mode has failed. The access lists on each peer needs to mirror each other all entries need to be reversible. This example illustrates this point. This message appears if the phase 2 IPsec does not match on both sides.
This occurs most commonly if there is a mismatch or an incompatibility in the transform set. This message indicates that the peer address configured on the router is wrong or has changed. Verify that the peer address is correct and that the address can be reached. This error message appears normally with the corresponding VPN Concentrator error message Message: No proposal chosen IPSec provides security for transmission of sensitive information over unprotected networks such as the Internet.
IPSec provides a robust security solution and is standards-based. IPSec provides data authentication and anti-replay services in addition to data confidentiality services. Specifies a remote peer's name as the fully qualified domain name, for example remotepeer. Clears the traffic counters maintained for each security association; counters does not clear the security associations themselves.
If the peermapentryor counters keyword is not used, all IPSec security associations are deleted. If the security associations were established via Internet Key Exchange, they are deleted and future IPSec traffic will require new security associations to be negotiated.
If the security associations are manually established, the security associations are deleted and reinstalled.
If peermapentryor counters keywords are not used, all IPSec security associations will be deleted. If any of the above commands cause a particular security association to be deleted, all the "sibling" security associations—that were established during the same IKE negotiation—are deleted as well. The counters keyword simply clears the traffic counters maintained for each security association; it does not clear the security associations themselves.
If you make configuration changes that affect security associations, these changes will not apply to existing security associations but to negotiations for subsequent security associations. You can use the clear crypto sa command to restart all security associations so they will use the most current configuration settings. In the case of manually established security associations, if you make changes that affect security associations you must use the clear crypto sa command before the changes take effect.
If the router is processing active IPSec traffic, it is suggested that you only clear the portion of the security association database that is affected by the changes, to avoid causing active IPSec traffic to temporarily fail. Note that this command only clears IPSec security associations; to clear IKE state, use the clear crypto isakmp command. The following example clears and reinitializes if appropriate all IPSec security associations at the router:.
The following example clears and reinitializes if appropriate the inbound and outbound IPSec security associations established along with the security association established for address To create a dynamic crypto map entry and enter the crypto map configuration command mode, use the crypto dynamic-map global configuration command.
To delete a dynamic crypto map set or entry, use the no form of this command. Global configuration. Using this command puts you into crypto map configuration mode. Use dynamic crypto maps to create policy templates that can be used when processing negotiation requests for new security associations from a remote IP Security peer, even if you do not know all of the crypto map parameters required to communicate with the remote peer such as the peer's IP address.
For example, if you do not know about all the IPSec remote peers in your network, a dynamic crypto map allows you to accept requests for new security associations from previously unknown peers. However, these requests are not processed until the Internet Key Exchange authentication has completed successfully.View Answer.
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The show isakmp ipsec-over-tcp stats command was added. The show isakmp ipsec-over-tcp stats command was deprecated. The show crypto isakmp ipsec-over-tcp stats command replaced it. The output from this command includes the following fields:. The show isakmp sa command was added. This command was deprecated. The show crypto isakmp sa command replaced it. The following example, entered in global configuration mode, displays detailed information about the SA database:. To display runtime statistics, use the show isakmp stats command in global configuration mode or privileged EXEC mode.
show security ipsec inactive-tunnels
The show isakmp stats command was added. The show crypto isakmp stats command replaced it. Each one of the counters maps to an associated cikePhase1GW counter.
Optional Displays the contents of each link-state packet LSP. This command displays the IS-IS link-state database.
The following is sample output from the show isis database command:. The LSP identifier. The next octet is the pseudonode ID. When this byte is nonzero, the LSP describes links from the system.
The LSP will describe the state of the originating router. The last octet is the LSP number. Each fragment will have a different LSP number. Sequence number for the LSP that allows other systems to determine if they have received the latest information from the source. Amount of time the LSP remains valid in seconds. The Attach bit. This bit indicates that the router is also a Level 2 router, and it can reach other areas.We are mentioning the steps are listed below and can help streamline the troubleshooting process for you.
Command — show vpn-sessiondb detail l2l. Command — Show vpn-sessiondb anyconnect. The following examples shows the username William and index number Command — show crypto isakmp sa. Phase 1 has successfully completed. Command — show crypto IPsec sa. An encrypted tunnel is built between Command — show run crypto ikev2. Command — more system:running-config.
Also want to see the pre-shared-key of vpn tunnel. In General show running-config command hide encrypted keys and parameters.
Below commands is a filters to see the specific peer tunnel-gorup of vpn tunnel. Command — show run crypto map. Below command is a filter command use to see specify crypto map for specify tunnel peer.
Command — Show Version. Show Version command show the Device Uptime, software version, license details, Filename, hardware details etc. Command — show vpn-sessiondb license-summary.
Command — show crypto ipsec stats. We want to reassure our reader stay safe and Healthy. Stay Home and Be Safe. Like this: Like Loading Author: Ronnie Singh. Related Articles. Thank you Ronnie Loading Thank you Amir Loading Your Feedback is Valuable for us. Pls do comments. Cancel reply. Poor password management. Leaving your computer onunattended. Opening email attachment from strangers PC. Not installing anti-virus software.Command introduced in Junos OS Release This option is used to filter the output.
For a list of all inactive tunnels with their index numbers, use the command with no options. The fpc slot-numberkmd-instance all kmd-instance-nameand pic slot-number parameters apply to SRX and SRX devices only.
Output fields are listed in the approximate order in which they appear. Table 1: show security ipsec inactive-tunnels Output Fields. Identification number of the inactive tunnel. You can use this number to get more information about the inactive tunnel. Otherwise, it is the standard IKE port, Identity of the local peer so that its partner destination gateway can communicate with it.
The value is specified as an IP address, fully qualified domain name, e-mail address, or distinguished name DN. State of the don't fragment bit: set or clear.
Tunnel event and the number of times the event has occurred. See Tunnel Events for descriptions of tunnel events and the action you can take. Help us improve your experience. Let us know what you think. Do you have time for a two-minute survey? Maybe Later. Related Documentation show security ipsec security-associations.
Total inactive tunnels. Total number of inactive IPsec tunnels. Total inactive tunnels which establish immediately.
IPsec Troubleshooting: Understanding and Using debug Commands
Total number of inactive IPsec tunnels that can establish a session immediately. IP address of the remote gateway. Virtual system.
Virtual system to which the VPN belongs.IPsec VPN Tunnel
VPN name. Local gateway. Gateway address of the local system. Remote gateway. Gateway address of the remote system. Local identity. Remote identity. IP address of the destination peer gateway.
Version of IKE. The tunnel interface to which the route-based VPN is bound. Name of the applicable policy.Command introduced in Junos OS Release Output fields are listed in the approximate order in which they appear. Cryptography used to secure exchanges between peers during the IKE Phase 2 negotiations includes:.
An authentication algorithm used to authenticate exchanges between the peers. Options are hmac-mdhmac-shaor hmac-sha An encryption algorithm used to encrypt data traffic. Options are 3des-cbcaescbcaescbcaescbcor des-cbc. Security parameter index SPI identifier. Each entry includes the name of the VPN, the remote gateway address, the SPIs for each direction, the encryption and authentication algorithms, and keys. The peer gateways each have two SAs, one resulting from each of the two phases of negotiation: Phase 1 and Phase 2.
The Mon field refers to VPN monitoring status. A V means that IPSec datapath verification is in progress. Otherwise, it is the standard IKE port, Table 2: show security ipsec sa detail Output Fields.
Identity of the local peer so that its partner destination gateway can communicate with it.
The value is specified as an IP address, fully qualified domain name, e-mail address, or distinguished name DN. State of the don't fragment bit: set or cleared. Expires in seconds - Number of seconds left until the SA expires.
The lifesize remaining specifies the usage limits in kilobytes. If there is no lifesize specified, it shows unlimited. The soft lifetime informs the IPsec key management system that the SA is about to expire.
Each lifetime of an SA has two display options, hard and soft, one of which must be present for a dynamic SA.
show security ipsec security-associations
This allows the key management system to negotiate a new SA before the hard lifetime expires. They are static and are configured by the user. Dynamic SAs are not supported in transport mode.