Because this option is the default, the on-demand keyword does not appear in configuration output. With the IPsec Dead Peer Detection Periodic Message Option feature, you can configure your router so that DPD messages are "forced" at regular intervals. DPD is a method used by devices to verify the current existence and availability of IPsec peers. Likewise, it is sometimes necessary to detect black holes to recover lost resources. Dead Peer Detection ( DPD) is a method that allows detection of unreachable Internet Key Exchange (IKE) peers. An account on Cisco.com is not required. Once 1 DPD message is missed by the peer, the router moves to a more aggressive state and sends the DPD retry message at the faster retry interval, which is the number of seconds between DPD retries if the DPD message is missed by the peer. key If the timer is set for 10 seconds, the router sends a hello message every 10 seconds (unless, of course, the router receives a hello message from the peer). This forced approach results in earlier detection of dead peers. Specifies an IPsec peer in a crypto map entry. Technical Tip: Configuring DPD (dead peer detectio Technical Tip: Configuring DPD (dead peer detection) on IPsec VPN. Abstract This document describes the method detecting a dead Internet Key Exchange (IKE) peer that is presently in use by a number of vendors. Starting in Junos OS Release 17.2R1, the dead-peer-detection options are also applicable to IKEv2 SAs. If you configure multiple peers, the router switches over to the next listed peer for a stateless failover. The IPsec Dead Peer Detection Periodic Message Option feature allows you to configure your router to query the liveliness of its Internet Key Exchange (IKE) peer at regular intervals. clear connect The above message shows what happens when the remote peer is unreachable. ezvpn The benefit of IOS keepalives and periodic DPD is earlier detection of dead peers. Router (config-crypto-map)# match address 101. 3. There needs a mechanism to detect remote peer failure. Implementations that support DPD include the Cisco VPN 3000 concentrator, Cisco PIX Firewall, Cisco VPN Client, and Cisco IOS XE software in all modes of operation--site-to-site, Easy VPN remote, and Easy VPN server. (1110R). IKEIKE SAIPsec SADPDDead Peer Detection IKEIKE SAIPsec SA {auto | manual}, 5. name, 4. The following configuration tells the router to send a periodic DPD message every 30 seconds. match address 101, Table 1Feature Information for Dead Peer Detection, IPsec Anti-Replay Window Expandingand Disabling, Invalid Security Parameter Index Recovery, IPsec Dead Peer Detection PeriodicMessage Option, DF Bit Override Functionality with IPsec Tunnels, Prerequisites for IPsec Dead Peer Detection PeriodicMessage Option, Restrictions for IPsec Dead Peer Detection PeriodicMessage Option, Information About IPsec Dead Peer DetectionPeriodic Message Option, How DPD and Cisco IOS XE Keepalive Features Work, Using the IPsec Dead Peer Detection Periodic Message Option, Using DPD and Cisco IOS XE Keepalive Featureswith Multiple Peers in the Crypto Map, Using DPD in an Easy VPN Remote Configuration, How to Configure IPsec Dead Peer Detection PeriodicMessage Option, Configuring DPD and Cisco IOS XE Keepalives with Multiple Peersin the Crypto Map, Configuration Examples for IPsec Dead Peer DetectionPeriodic Message Option, Site-to-Site Setup with Periodic DPD Enabled Example, Easy VPN Remote with DPD Enabled Example, Verifying DPD Configuration Using the debug crypto isakmp Command Example, DPD and Cisco IOS XE Keepalives Used in Conjunction with Multiple Peers in a Crypto Map Example, DPD Used in Conjunction with Multiple Peers for an Easy VPN Remote Example, Feature Information for Dead Peer DetectionPeriodic Message Option, Site-to-Site Setup with disable <----- Disable Dead Peer Detection. If the timer is set for 10 seconds, the router will send a hello message every 10 seconds (unless, of course, the router receives a hello message from the peer). In this example, an SA could be set up to the IPsec peer at 10.10.10.10, 10.2.2.2, or 10.3.3.3. The following sample output from the debug crypto isakmp command verifies that IKE DPD is enabled: To see that IKE DPD is enabled (and that the peer supports DPD): when periodic DPD is enabled, you should see the following debug messages at the interval specified by the command: The above message corresponds to sending the DPD R_U_THERE message. The following example shows that DPD is used in conjunction with multiple peers in an Easy VPN remote configuration. However, unlike NAT traversal or DoS attacks for example, the official RFC 4306 did not mention how to address this problem. Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. If you want to configure the DPD periodic message option, you should use the Once 1 DPD message is missed by the peer, the router moves to a more aggressive state and sends the DPD retry message at the faster retry interval, which is the number of seconds between DPD retries if the DPD message is missed by the peer. Dead Peer Detection: Dead Peer Detection: Turned on: Check peer after every: 30: Wait for response up to: 120: When peer unreachable: Re-initiate: Click Save. periodic keyword. group ipsec The commands in this article will help to configure DPD (dead peer detection) on IPsec VPN. DPD also has an on-demand approach. The IPsec Dead Peer Detection Periodic Message Option feature is used to configure the router to query the liveliness of its Internet Key Exchange (IKE) peer at regular intervals. The IPsec Dead Peer Detection Periodic Message Option feature is used to configure the router to query the liveliness of its Internet Key Exchange (IKE) peer at regular intervals. A keepalive timer of 10 seconds with 5 retries seems to work well with HA because of the time that it takes for the router to get into active mode. Prerequisites for IPsec Dead Peer Detection PeriodicMessage Option, Restrictions for IPsec Dead Peer Detection PeriodicMessage Option, Information About IPsec Dead Peer DetectionPeriodic Message Option, How DPD and Cisco IOS Keepalive Features Work, Using the IPsec Dead Peer Detection Periodic Message Option, Using DPD and Cisco IOS Keepalive Featureswith Multiple Peers in the Crypto Map, Using DPD in an Easy VPN Remote Configuration, How to Configure IPsec Dead Peer Detection PeriodicMessage Option, Configuring DPD and Cisco IOS Keepalives with Multiple Peersin the Crypto Map, Configuration Examples for IPsec Dead Peer DetectionPeriodic Message Option, Site-to-Site Setup with Periodic DPD Enabled Example, Easy VPN Remote with DPD Enabled Example, Verifying DPD Configuration Using the debug crypto isakmp Command Example, DPD and Cisco IOS Keepalives Used in Conjunction with Multiple Peers in a Crypto Map Example, DPD Used in Conjunction with Multiple Peers for an Easy VPN Remote Example, Feature Information for IPsec Dead Peer Detection Periodic Message Option, Site-to-Site Setup with Periodic DPD Enabled Example, Verifying DPD Configuration Using the debug crypto isakmp Command Example, DPD and Cisco IOS Keepalives Used in Conjunction with Multiple Peers in a Crypto Map Example, DPD Used in Conjunction with Multiple Peers for an Easy VPN Remote Example. If you configure multiple peers, the router switches over to the next listed peer for a stateless failover. This asynchronous property of DPD exchanges allows fewer messages to be sent, and this is how DPD achieves greater scalability. The button should turn green, indicating that the connection is . 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. DPD allows the router to clear the IKE state when a peer becomes unreachable. terminal, 3. This command can be repeated multiple times. on-demand <----- Trigger Dead Peer Detection when IPsec traffic is sent but no reply is received from the peer. configure peer The benefit of this approach over the default approach (on-demand dead peer detection) is earlier detection of dead peers. Enable the device to use dead peer detection (DPD). For the latest feature information and caveats, see the release notes for your platform and software release. 3. periodic keyword, the router defaults to the on-demand approach. You can specify more than one transform set name by repeating this command. If a router has no traffic to send, it never sends a DPD message. With the IPsec Dead Peer Detection Periodic Message Option feature, you can configure your router so that DPD messages are forced at regular intervals. Router (config-crypto-ezvpn)# mode client. If DPD is enabled and the peer is unreachable for some time, you can use the clear crypto session command to manually clear IKE and IPsec SAs. Implementations that support DPD include the Cisco VPN 3000 concentrator, Cisco PIX Firewall, Cisco VPN Client, and Cisco IOS software in all modes of operation--site-to-site, Easy VPN remote, and Easy VPN server. The following command was introduced: [local ip-address [port local-port]] [remote ip-address [port remote-port]] | [fvrf vrf-name] [ivrf vrf-name], 3. Sets the peer IP address or host name for the VPN connection. The following configurations are for a site-to-site setup with no periodic DPD enabled. seconds However, use of periodic DPD incurs extra overhead. ipsec-isakmp, 4. However, use of periodic DPD incurs extra overhead. Specifies an extended access list for a crypto map entry. The benefit of this approach over the default approach (on-demand dead peer detection) is earlier detection of dead peers. connect The following command was introduced or modified: set group seq-num Router (config-crypto-map)# set peer 10.12.12.12. crypto group-key, 6. This RFC describes DPD negotiation procedure and two newISAKMP NOTIFYmessages. The above message corresponds to receiving the acknowledge (ACK) message from the peer. Manually establishes and terminates an IPsec VPN tunnel on demand. Using periodic DPD potentially allows the router to detect an unresponsive IKE peer with better response time when compared to on-demand DPD. However, IOS keepalives and periodic DPD rely on periodic messages that have to be sent with considerable frequency. client Before configuring the IPsec Dead Peer Detection Periodic Message Option feature, you should have the following: Using periodic DPD potentially allows the router to detect an unresponsive IKE peer with better response time when compared to on-demand DPD. To configure DPD with IPsec High Availability (HA), the recommendation is to use a value other than the default (which is 2 seconds). isakmp client debug DPD is a method used by devices to verify the current existence and availability of IPsec peers. To locate and download MIBs for selected platforms, Cisco IOS software releases, and feature sets, use Cisco MIB Locator found at the following URL: DPD conforms to the Internet draft draft-ietf-ipsec-dpd-04.txt, which is pending publication as an Informational RFC (a number has not yet been assigned). The benefit of this approach over the default approach (on-demand dead peer detection) is earlier detection of dead peers. mode To access Cisco Feature Navigator, go to If a router has no traffic to send, it never sends a DPD message. keepalive. If the peer fails to respond to the DPD R_U_THERE message, the router will resend the message every 20 seconds (four transmissions altogether). set A hostname can be specified only when the router has a DNS server available for host-name resolution. When the on-demand keyword is used, this argument is the number of seconds during which traffic is not received from the peer before DPD retry messages are sent if there is data (IPSec) traffic to send; the range is from 10 to 3600 seconds. terminal, 3. address Symptom. If the timer is set for 10 seconds, the router sends a "hello" message every 10 seconds (unless, of course, the router receives a "hello" message from the peer). With on-demand DPD, messages are sent on the basis of traffic patterns. www.cisco.com/go/cfn. set peer 10.2.80.209 Learn more about how Cisco is using Inclusive Language. A complete DPD exchange (i.e., transmission of R-U-THERE and receipt of corresponding R-U-THERE-ACK) will serve as proof of liveliness until the next idle period. group-name Ikemgr.log (CLI: less mp-log ikemgr.log) indicating the tunnel going down due to DPD. Its tight integration with the Security Fabric enables policy-based automation to contain threats and control outbreaks. Before configuring the IPsec Dead Peer Detection Periodic Message Option feature, you should have the following: Using periodic DPD potentially allows the router to detect an unresponsive IKE peer with better response time when compared to on-demand DPD. The IPsec Dead Peer Detection Periodic Message Option feature is used to configure the router to query the liveliness of its Internet Key Exchange (IKE) peer at regular intervals. Automatic insertion and deletion of IPsec-policy-based firewall rules; NAT-Traversal via UDP encapsulation and port floating ; Support of IKEv2 message fragmentation to avoid issues with IP fragmentation; Dead Peer Detection (DPD, RFC 3706) takes care of dangling tunnels; Static virtual IPs and IKEv1 ModeConfig pull and push modes address The benefit of this approach over the default approach (on-demand dead peer detection) is earlier detection of dead peers. See the section Configuring DPD for an Easy VPN Remote. The dead-peer-detection options are used for IKEv1 security associations (SAs). An IKE peer that supports DPD (dead peer detection). To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table. set . The following configuration tells the router to send a periodic DPD message every 30 seconds. A keepalive timer of 10 seconds with 5 retries seems to work well with HA because of the time that it takes for the router to get into active mode. The benefit of this approach over the default approach (on-demand dead peer detection) is earlier detection of dead peers. set Description Sets dead peer detection options when dead peer detection has been enabled with the initiate-dead-peer-detection command. keepalive. Allows the gateway to send DPD messages to the peer. 2. peer The following Manually establishes and terminates an IPsec VPN tunnel on demand. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. configure To configure DPD in an Easy VPN remote configuration, perform the following steps. Specifies an extended access list for a crypto map entry. client crypto crypto DPD (Dead Peer Detection) IPsec () IPsec () . Configure Dead peer detection in Cisco ASA firewall. If you configure multiple peers, the router will switch over to the next listed peer for a stateless failover. clear crypto Essentially, keepalives and heartbeats mandate exchange of HELLOs at regular intervals. For example, if a router has to send outbound traffic and the liveliness of the peer is questionable, the router sends a DPD message to query the status of the peer. 1. {client | network-extension}, 7. {host-name [dynamic] | ip-address}, 5. ipsec-isakmp, 4. DPD retries are sent on demand. Dead Peer Detection (DPD) is the method to detect the aliveness of an IPsec connection. www.cisco.com/go/trademarks. The following example shows that DPD and Cisco IOS XE keepalives are used in conjunction with multiple peers in a crypto map configuration when IKE will be used to establish the security associations (SAs). 2. The contrasting on-demand approach is the default. Router (config-crypto-ezvpn)# connect manual. 11-07-2017 keepalive You can specify multiple peers by repeating this command. On the Dead Peer interval and retry, i set it to 5 and 5, respectively. Specifies an IPsec peer in a crypto map entry. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. A device performs this verification by sending encrypted IKE Phase 1 notification payloads (R-U-THERE messages) to a peer and waiting for DPD acknowledgements (R-U-THERE-ACK messages) from the peer. Cisco IOS XE keepalives are not supported for Easy VPN remote configurations. peer Use Cisco Feature Navigator to find information about platform support and Cisco software image support. crypto The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. When the on-demand keyword is used, this argument is the number of seconds during which traffic is not received from the peer before DPD retry messages are sent if there is data (IPSec) traffic to send; the range is from 10 to 3600 seconds. retry-seconds View with Adobe Reader on a variety of devices. Specifies which transform sets can be used with the crypto map entry. keepalive command is configured, the Cisco IOS software negotiates the use of Cisco IOS keepalives or DPD, depending on which protocol the peer supports. An account on Cisco.com is not required. In this example, an SA could be set up to the IPsec peer at 10.10.10.10, 10.2.2.2, or 10.3.3.3. When the on-demand keyword is used, this argument is the number of seconds during which traffic is not received from the peer before DPD retry messages are sent if there is data (IPSec) traffic to send; the range is from 10 to 3600 seconds. [local ip-address [port local-port]] [remote ip-address [port remote-port]] | [fvrf vrf-name] [ivrf vrf-name], 3. controls the use of the Dead Peer Detection protocol (DPD, RFC 3706) where R_U_THERE notification messages (IKEv1) or empty INFORMATIONAL messages (IKEv2) are periodically sent in order to check the liveliness of the IPsec peer. Finding Feature Information Sets the peer IP address or host name for the VPN connection. If the peer fails to respond to the DPD R_U_THERE message, the router resends the message every 20 seconds (four transmissions altogether). The following command was introduced: To access Cisco Feature Navigator, go to The benefit of IOS keepalives and periodic DPD is earlier detection of dead peers. Periodically, it will send a "ISAKMP R-U-THERE" packet to the peer, which will respond back with an "ISAKMP R-U-THERE-ACK" acknowledgement. DPD and IOS keepalive features can be used in conjunction with multiple peers in the crypto map to allow for stateless failover. The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. isakmp I.e. The debug crypto isakmp command can be used to verify that DPD is enabled. Periodic DPD Enabled Example. transform-set IKE peer should send an R-U-THERE query to its peer if it is interested in the liveliness of this peer. Manually establishes and terminates an IPsec VPN tunnel on demand. Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. The IPsec Dead Peer Detection Periodic Message Option feature is used to configure the router to query the liveliness of its Internet Key Exchange (IKE) peer at regular intervals. When communicating to large numbers of IKE peers, you should consider using on-demand DPD instead. This configuration also will cause a router to cycle through the peer list when it detects that the first peer is dead. This feature was introduced in Cisco IOS Release 12.3(7)T. This feature was integrated into Cisco IOS Release 12.2(33)SRA, This feature was integrated into Cisco IOS Release 12.2(33)SXH. on-demand Dead Peer Detection Periodic Message Option. The problem with current heartbeat and keepalive proposals is their reliance upon their messages to be sent at regular intervals. match group-key, 6. session crypto Implementations that support DPD include the Cisco VPN 3000 concentrator, Cisco PIX Firewall, Cisco VPN Client, and Cisco IOS software in all modes of operation--site-to-site, Easy VPN remote, and Easy VPN server. terminal, 3. Unless noted otherwise, subsequent releases of that software release train also support that feature. keepalive command with the map Some articles and Websites ( Wikipedia and Cisco for instance) claim that unlike IKEv1, IKEv2 provides a support for Dead Peer Detection. crypto For example, if a router has to send outbound traffic and the liveliness of the peer is questionable, the router sends a DPD message to query the status of the peer. Make sure the IPsec policies for both connections are the same, otherwise the VNet-to-VNet connection will not establish. This configuration causes a router to cycle through the peer list when it detects that the first peer is dead. The use of the word partner does not imply a partnership relationship between Cisco and any other company. If the peer fails to respond to the DPD R_U_THERE message, the router resends the message every 20 seconds (four transmissions altogether). transform-set-name, 6. You can specify multiple peers by repeating this command. The default DPD retry message is sent every 2 seconds. DPD and Cisco IOS keepalives function on the basis of the timer. crypto Finding Feature Information Familiarity with configuring IP Security (IPsec). To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document. Your software release may not support all the features documented in this module. In the first example, the tunnel is brought down manually using . When communicating to large numbers of IKE peers, you should consider using on-demand DPD instead. This forced approach results in earlier detection of dead peers. configure Specifies which transform sets can be used with the crypto map entry. See the section Configuring DPD for an Easy VPN Remote section. The dead-peer-detection options are used for IKEv1 security associations (SAs). An account on Cisco.com is not required. With on-demand DPD, messages are sent on the basis of traffic patterns. Cisco ASR 1000 Series Aggregation Services Routers, crypto map test 1 ipsec-isakmp To configure DPD and IOS keepalives to be used in conjunction with the crypto map to allow for stateless failover, perform the following steps. This problem of detecting a dead IKE peer has been addressed by proposals that require sending periodic HELLO/ACK messages to prove liveliness. To configure DPD in an Easy VPN remote configuration, perform the following steps. group-key, 6. A device performs this verification by sending encrypted IKE Phase 1 notification payloads (R-U-THERE messages) to a peer and waiting for DPD acknowledgements (R-U-THERE-ACK messages) from the peer. The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. set transform-set Trans1 seq-num A hostname can be specified only when the router has a DNS server available for host-name resolution. {ipaddress | hostname}. ASA may have nothing to send to the peer, but DPD is still sent if the peer is idle. Specifies the VPN mode of operation of the router. To this end, a number of vendors have implemented their own approach to detect peer liveliness without needing to send messages at regular intervals. On the Cisco router R2, I set "set crypto isakmp keepalive 10". When communicating to large numbers of IKE peers, you should consider using on-demand DPD instead. transform-set-name, 6. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. The auto keyword option is the default setting. DPD addresses the shortcomings of IKE keepalives- and heartbeats- schemes by introducing a more reasonable logic governing message exchange. The default DPD retry message is sent every 2 seconds. To access Cisco Feature Navigator, go to Router (config-crypto-map)# match address 101. --(Optional) Number of seconds between DPD retry messages if the DPD retry message is missed by the peer; the range is from 2 to 60 seconds. [access-list-id | name]. DPD is described in the informational RFC 3706: "A Traffic-Based Method of Detecting Dead Internet Key Exchange (IKE) Peers" authored by G. Huang, S. Beaulieu, D. Rochefort. isakmp The router sends one DPD R_U_THERE message and four retransmissions before it finally deletes the IPsec and IKE SAs. DPD can be used in an Easy VPN remote configuration. For example, if a router has to send outbound traffic and the liveliness of the peer is questionable, the router sends a DPD message to query the status of the peer. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. ASA and PIX firewalls support "semi-periodic" DPD only. The following example shows that DPD is used in conjunction with multiple peers in an Easy VPN remote configuration. Dead Peer Detection (DPD) refers to functionality documented in RFC 3706, which is a method of detecting dead Internet Key Exchange (IKE/Phase1) peers.Tunnel Monitoring is a Palo Alto Networks proprietary feature that verifies traffic is successfully passing across the IPSec tunnel in question by sending a PING down the tunnel to the configured destination. If you do not specify a time interval, an error message appears. 3. See the section Configuring DPD for an Easy VPN Remote section. configurations are for a site-to-site setup with no periodic DPD enabled. DPD is a method used by devices to verify the current existence and availability of IPsec peers. In this example, an SA could be set up to the IPsec peer at 10.0.0.1, 10.0.0.2, or 10.0.0.3. This informational document describes the current practice of those implementations. periodic keyword, the router defaults to the on-demand approach. This command can be repeated multiple times. Overview. Turn off dead peer detection, tunnel comes up, but later on tunnel goes down. Enable Dead Peer Detection for Idle VPN Sessions - Select this setting if you want idle VPN connections to be dropped by the firewall after the time value defined in the Dead Peer Detection Interval for Idle VPN Sessions (seconds) field. On the other hand, if the router has traffic to send to the peer, and the peer does not respond, the router initiates a DPD message to determine the state of the peer. In Junos OS Release 17.1 and earlier, the dead-peer-detection options are not applicable to . crypto The router sends one DPD R_U_THERE message and four retransmissions before it finally deletes the IPsec and IKE SAs. 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. These schemes tend to be unidirectional (a HELLO only) or bidirectional (a HELLO/ACK pair). When the 3. You can specify more than one transform set name by repeating this command. The connection is established successfully (I can ping and transfer over vpn), but after ~3min the DeadPeerDetection kills the vpn, so it must be re-established. An IKE peer that supports DPD (dead peer detection). transform-set-name, 6. No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. DPD also has an on-demand approach. {auto | manual}, 5. Specifies an IPsec peer in a crypto map entry. group Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. This configuration will cause a router to cycle through the peer list when it detects that the first peer is dead. Almost everything is left to an implementation. Dead Peer Detection (DPD) is a method that allows detection of unreachable Internet Key Exchange (IKE) peers. In this example, an SA could be set up to the IPsec peer at 10.0.0.1, 10.0.0.2, or 10.0.0.3. isakmp. Five aggressive DPD retry messages can be missed before the tunnel is marked as down. Enters crypto map configuration mode and creates or modifies a crypto map entry. The above message corresponds to receiving the acknowledge (ACK) message from the peer. keepalive command with the seconds DPD allows the router to clear the IKE state when a peer becomes unreachable. dead peer detection DPD on the remote access SSL VPN is the equivalent of the --ping and --ping-restart options in OpenVPN. 2. Unless noted otherwise, subsequent releases of that software release train also support that feature. keepalive command with the If you do not specify a time interval, an error message appears. periodic keyword. It is useful in IPsec high availability designs when multiple gateways are available to build VPN tunnels between endpoints. isakmp Similarly, because rapid detection of the dead peer is often desired, these messages must be sent with some frequency, again translating into considerable overhead for message processing. The benefit of this approach over the default approach (on-demand dead peer detection) is earlier detection of dead peers. [access-list-id | name], Router (config)# crypto map green 1 ipsec-isakmp. Dead Peer Detection ( DPD) is a method that allows detection of unreachable Internet Key Exchange (IKE) peers. crypto map For example, if a router has no traffic to send, a DPD message is still sent at regular intervals, and if a peer is dead, the router does not have to wait until the IKE SA times out to find out. Starting in Junos OS Release 17.2R1, the dead-peer-detection options are also applicable to IKEv2 SAs. enable, 2. During IPsec tunnel creation, VPN peers will negotiate to decide whether to use DPD or not. {client | network-extension}, 7. Enable the device to use dead peer detection (DPD). Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Enters crypto map configuration mode and creates or modifies a crypto map entry. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental. An account on Cisco.com is not required. Five aggressive DPD retry messages can be missed before the tunnel is marked as down. On the other hand, if the router has traffic to send to the peer, and the peer does not respond, the router initiates a DPD message to determine the state of the peer. name, 4. The use of the word partner does not imply a partnership relationship between Cisco and any other company. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. The debug crypto isakmp command can be used to verify that DPD is enabled. (1005R). IPsec Dead Peer Detection Periodic Message Option. Five aggressive DPD retry messages can be missed before the tunnel is marked as down. This configuration causes a router to cycle through the peer list when it detects that the first peer is dead. It is often desirable to recognize black holes as soon as possible so that an entity can failover to a different peer quickly. No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. DPD is described in the informational RFC 3706: "A Traffic-Based Method of Detecting Dead Internet Key Exchange (IKE) Peers" authored by G. Huang, S. Beaulieu, D. Rochefort. crypto Specifies which transform sets can be used with the crypto map entry. Specifies the group name and key value for the Virtual Private Network (VPN) connection. {host-name [dynamic] | ip-address}, 5. Prerequisites for IPsec Dead Peer Detection PeriodicMessage Option, Restrictions for IPsec Dead Peer Detection PeriodicMessage Option, Information About IPsec Dead Peer DetectionPeriodic Message Option, How DPD and Cisco IOS Keepalive Features Work, Using the IPsec Dead Peer Detection Periodic Message Option, Using DPD and Cisco IOS Keepalive Featureswith Multiple Peers in the Crypto Map, Using DPD in an Easy VPN Remote Configuration, How to Configure IPsec Dead Peer Detection PeriodicMessage Option, Configuring DPD and Cisco IOS Keepalives with Multiple Peersin the Crypto Map, Configuration Examples for IPsec Dead Peer DetectionPeriodic Message Option, Site-to-Site Setup with Periodic DPD Enabled Example, Easy VPN Remote with DPD Enabled Example, Verifying DPD Configuration Using the debug crypto isakmp Command Example, DPD and Cisco IOS Keepalives Used in Conjunction with Multiple Peers in a Crypto Map Example, DPD Used in Conjunction with Multiple Peers for an Easy VPN Remote Example, Feature Information for IPsec Dead Peer Detection Periodic Message Option, Site-to-Site Setup with Periodic DPD Enabled Example, Verifying DPD Configuration Using the debug crypto isakmp Command Example, DPD and Cisco IOS Keepalives Used in Conjunction with Multiple Peers in a Crypto Map Example, DPD Used in Conjunction with Multiple Peers for an Easy VPN Remote Example. It is important to note that the decision about when to initiate a DPD exchange is implementation specific. configure http://www.cisco.com/cisco/web/support/index.html. In the implementation, this translates into managing some timer to service these message intervals. Security threats, as well as the . Once 1 DPD message is missed by the peer, the router moves to a more aggressive state and sends the DPD retry message at the faster retry interval, which is the number of seconds between DPD retries if the DPD message is missed by the peer. isakmp The following table provides release information about the feature or features described in this module. Router (config-crypto-ezvpn)# peer 10.10.10.10. This command can be repeated multiple times. www.cisco.com/go/cfn. What is Dead Peer Detection (DPD)? Go to Site-to-site VPN > IPsec. ezvpn Dead Peer Detection DPD is a monitoring function used to determine liveliness of the Security-SA (Security Association and IKE, Phase 1) DPD is used to detect if the peer device still has a valid IKE-SA. 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