Can you please help me to understand this? Hope this helps. If the lifetimes are not identical, then the ASA uses a shorter lifetime. The expected output is to see both the inbound and outbound Security Parameter Index (SPI). In order to verify whether IKEv1 Phase 1 is up on the ASA, enter theshow crypto ikev1 sa (or,show crypto isakmp sa)command. Alternatively, you can make use of the commandshow vpn-sessiondbtoverify the details for both Phases 1 and 2, together. Configure IKE. The ASA supports IPsec on all interfaces. Establish a policy for the supported ISAKMP encryption, authentication Diffie-Hellman, lifetime, and key parameters. Here is an example: Ensure that there is connectivity to both the internal and external networks, and especially to the remote peer that will be used in order to establish a site-to-site VPN tunnel. 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. Some of the command formats depend on your ASA software level. 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. Establish a policy for the supported ISAKMP encryption, authentication Diffie-Hellman, lifetime, and key parameters. Learn more about how Cisco is using Inclusive Language. * Found in IKE phase I main mode. 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 show vpn-sessiondb ra-ikev1-ipsec. NTP synchronizes the timeamong a set of distributed time servers and clients. It depends if traffic is passing through the tunnel or not. If peer ID validation is enabled and if IKEv2 platform debugs are enabled on the ASA, these debugs appear: For this issue, either the IP address of the certificate needs to be included in the peercertificate, or peer ID validation needs to be disabled on the ASA. 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. or not? Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. 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. Well, aside from traffic passing successfully through the new tunnels, the command: will show the status of the tunnels (command reference). This section describes how to complete the ASA and IOS router CLI configurations. - edited Deleted or updated broken links. The ASA then applies the matched transform set or proposal in order to create an SA that protects data flows in the access list for that crypto map. 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. 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. Learn more about how Cisco is using Inclusive Language. 04:48 AM Caution: On the ASA, you can set various debug levels; by default, level 1 is used. Some of the command formats depend on your ASA software level. If certificates (rather than pre-shared keys) are used for authentication, the auth payloads are considerably larger. Do this with caution, especially in production environments! 11-01-2017 Then you will have to check that ACLs contents either with. The router does this by default. 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. The expected output is to see both the inbound and outbound Security Parameter Index (SPI). However, I wanted to know what was the appropriate "Sh" commands i coud use to confirm the same. 1. 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. 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. PAN-OS Administrators Guide. 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. Configure tracker under the system block. command. Phase 1 = "show crypto isakmp sa" or "show crypto ikev1 sa" or "show crypto ikev2 sa". This is the destination on the internet to which the router sends probes to determine the Details 1. 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. If the lifetimes are not identical, then the ASA uses the shorter lifetime. Phase 1 = "show crypto isakmp sa" or "show crypto ikev1 sa" or "show crypto ikev2 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. I need to confirm if the tunnel is building up between 5505 and 5520? Edited for clarity. This usually results in fragmentation, which can then cause the authentication to fail if a fragment is lost or dropped in the path. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! : 10.31.2.19/0, remote crypto endpt. This command show run crypto mapis e use to see the crypto map list of existing Ipsec vpn tunnel. Network 1 and 2 are at different locations in same site. 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. VRF - Virtual Routing and Forwarding VRF (Virtual Routing and Forwarding) is revolutionary foot print in Computer networking history that STATIC ROUTING LAB CONFIGURATION - STATIC ROUTING , DEFAULT ROUTING , GNS3 LAB , STUB AREA NETWORK FOR CCNA NETWORK HSRP and IP SLA Configuration with Additional Features of Boolean Object Tracking - Network Redundancy configuration on Cisco Router BGP and BGP Path Attributes - Typically BGP is an EGP (exterior gateway protocol) category protocol that widely used to NetFlow Configuration - ASA , Router and Switch Netflow configuration on Cisco ASA Firewall and Router using via CLI is Cisco ASA IPsec VPN Troubleshooting Command, In this post, we are providing insight on, The following is sample output from the , local ident (addr/mask/prot/port): (172.26.224.0/255.255.254.0/0/0), remote ident (addr/mask/prot/port): (172.28.239.235/255.255.255.255/0/0), #pkts encaps: 8515, #pkts encrypt: 8515, #pkts digest: 8515, #pkts decaps: 8145, #pkts decrypt: 8145, #pkts verify: 8145, Hardware: ASA5525, 8192 MB RAM, CPU Lynnfield 2394 MHz, 1 CPU (4 cores), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Cisco ASA IPsec VPN Troubleshooting Command VPN Up time, Crypto,Ipsec, vpn-sessiondb, Crypto map and AM_ACTIVE, BGP Black Hole Theory | BGP Black Hole Lab || Router Configuration, Cloud connecting | Cisco Cloud Services Router (CSR) 1000v (MS-Azure & Amazon AWS), LEARN EASY STEPS TO BUILD AND CONFIGURE VPN TUNNEL BETWEEN OPENSWAN (LINUX) TO CISCO ASA (VER 9.1), Digital SSL Certificate Authority (CA) Top 10 CA List, HTTP vs HTTPS Protocol Internet Web Protocols, Basic Routing Concepts And Protocols Explained, Security Penetration Testing Network Security Evaluation Programme, LEARN STEP TO INTEGRATE GNS3 INTEGRATION WITH CISCO ASA VERSION 8.4 FOR CISCO SECURITY LAB, Dual-Stack Lite (DS-Lite) IPv6 Transition Technology CGNAT, AFTR, B4 and Softwire, Small Remote Branch Office Network Solutions IPsec VPN , Openswan , 4G LTE VPN Router and Meraki Cloud , VRF Technology Virtual Routing and Forwarding Network Concept, LEARN STATIC ROUTING LAB CONFIGURATION STATIC ROUTING , DEFAULT ROUTING , GNS3 LAB , STUB AREA NETWORK FOR CCNA NETWORK BEGINNER, LEARN HSRP AND IP SLA CONFIGURATION WITH ADDITIONAL FEATURES OF BOOLEAN OBJECT TRACKING NETWORK REDUNDANCY CONFIGURATION ON CISCO ROUTER. Errors within an issued certicate, such as an incorrect identity or the need to accommodate a name change. show vpn-sessiondb detail l2l. Miss the sysopt Command. 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. If your network is live, ensure that you understand the potential impact of any command. 2023 Cisco and/or its affiliates. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. - edited 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. Customers Also Viewed These Support Documents. 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. Note:An ACL for VPN traffic uses the source and destination IP addresses after Network Address Translation (NAT). In General show running-config command hide encrypted keys and parameters. 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. The identity NAT rule simply translates an address to the same address. 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. 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. 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. 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? 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. Next up we will look at debugging and troubleshooting IPSec VPNs. Next up we will look at debugging and troubleshooting IPSec VPNs. To see details for a particular tunnel, try: show vpn-sessiondb l2l. Note:For each ACL entry there is a separate inbound/outbound SA created, which can result in a longshow crypto ipsec sacommand output (dependent upon the number of ACE entries in the crypto ACL). ASA-1 and ASA-2 are establishing IPSCE Tunnel. New here? show crypto isakmp sa. However, when you configure the VPN in multi-context mode, be sure to allocate appropriate resources in the system thathas the VPN configured. You must assign a crypto map set to each interface through which IPsec traffic flows. VPNs. If a site-site VPN is not establishing successfully, you can debug it. 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. Web0. 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. 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. 01-08-2013 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. : 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. IKEv1: Tunnel ID : 3.1 UDP Src Port : 500 UDP Dst Port : 500 IKE Neg Mode : Main Auth Mode : preSharedKeys Encryption : AES256 Hashing : SHA1 Rekey Int (T): 86400 Seconds Rekey Left(T): 82325 Seconds D/H Group : 2 Filter Name : IPv6 Filter : IPsec: Tunnel ID : 3.2 Local Addr : 192.168.2.128/255.255.255.192/0/0 Remote Addr : 0.0.0.0/0.0.0.0/0/0 Encryption : AES256 Hashing : SHA1 Encapsulation: Tunnel Rekey Int (T): 28800 Seconds Rekey Left(T): 24725 Seconds Rekey Int (D): 4608000 K-Bytes Rekey Left(D): 4607701 K-Bytes Idle Time Out: 30 Minutes Idle TO Left : 29 Minutes Bytes Tx : 71301 Bytes Rx : 306744 Pkts Tx : 1066 Pkts Rx : 3654. 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. Do this with caution, especially in production environments. IPSec LAN-to-LAN Checker Tool. 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. You can use a ping in order to verify basic connectivity. Note: The configuration that is described in this section is optional. To check if phase 2 ipsec tunnel is up: GUI: Navigate to Network->IPSec Tunnels GREEN indicates up RED indicates down. The good thing is that i can ping the other end of the tunnel which is great. 07:52 AM Secondly, check the NAT statements. 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. Note:An ACL for VPN traffic uses the source and destination IP addresses after Network Address Translation (NAT). You should see a status of "mm active" for all active tunnels. 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 set up a site-to-site Internet Key Exchange version 2 (IKEv2) tunnel between a Cisco Adaptive Security Appliance (ASA) and a router that runs Cisco IOS software. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! So using the commands mentioned above you can easily verify whether or not an IPSec tunnel is active, down, or still negotiating. On Ubuntu, you would modify these two files with configuration parameters to be used in the IPsec tunnel. For the scope of this post Router (Site1_RTR7200) is not used. Regards, Nitin 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. 04:12 PM. For more information on how to configure NTP, refer to Network Time Protocol: Best Practices White Paper. How to know Site to Site VPN up or Down st. Customers Also Viewed These Support Documents. Some of the command formats depend on your ASA software level. When the lifetime of the SA is over, the tunnel goes down? By default the router has 3600 seconds as lifetime for ipsec and 86400 seconds for IKE. When the life time finish the tunnel is retablished causing a cut on it? Set Up Site-to-Site VPN. 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. There is a global list of ISAKMP policies, each identified by sequence number. Ensure charon debug is enabled in ipsec.conf file: Where the log messages eventually end up depends on how syslog is configured on your system. This command show crypto IPsec sa shows IPsec SAs built between peers. However, when you use certificate authentication, there are certain caveats to keep in mind. 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. Next up we will look at debugging and troubleshooting IPSec VPNs.