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Create a Hub-and-Spoke Auto Discovery VPN

Before You Begin

The Auto-Discovery VPN (ADVPN) dynamically establishes VPN tunnels between spokes to avoid routing traffic through the hub.

To configure Hub and Spoke ADVPN:

  1. Select Configure > IPsec VPN > IPsec VPNs.

    The IPsec VPNs page is displayed.

  2. Click Create VPN > <Route Based>Hub and Spoke (ADVPN - Auto Discovery VPN).

    The Create Hub-and-Spoke (ADVPN - Auto Discovery VPN) page is displayed.

  3. Complete the VPN configuration parameters according to the guidelines provided in Table 1 through Table 4.

    Click each hub and spoke icon in the topology to configure the devices. Click View IKE/IPSec Settings to view or edit VPN profiles. If the VPN profile is default, you can edit the configurations. If the profile is shared, you can only view the configurations.

    The VPN connectivity will change from gray to blue line in the topology to show that the configuration is complete.

    The topology displayed for hub-and-spoke is only a representation. You can configure any number of hubs and spokes.

  4. Click Save to save the IPsec VPN configuration.
Figure 1: Create Hub-and-Spoke Auto Discovery VPNCreate Hub-and-Spoke Auto Discovery VPN
Table 1: IPsec VPN Configuration Parameters




Enter a unique string of alphanumeric characters, colons, periods, dashes, and underscores; spaces are not allowed; maximum length is 62 characters.


Enter a description for the VPN; maximum length is 255 characters.

Routing Topology

Select one of the following options:

  • OSPF-Dynamic Routing—Generates OSPF configuration.

  • RIP-Dynamic Routing—Generates RIP configuration.

  • eBGP-Dynamic Routing—Generates eBGP configuration.

VPN Profile

Select a VPN profile from the drop-down list based on the deployment scenario.

Default profile is applicable to a particular IPsec VPN only. You can view and edit the details by clicking View IKE/IPsec settings on the Create IPsec VPN page.

Shared profile can be used by one or more IPsec VPNs. You can only view the details of the shared profiles by clicking View IKE/IPsec settings on the Create IPsec VPN page.

If you select the VPN Profile value as Default, then while saving the IPsec VPN, you’ll need to save the new profile as either VPN specific or shared. If you are saving it as shared, then the profile will be listed on the VPN Profiles page.

Authentication Method

Select an authentication method from the list that the device uses to authenticate the source of Internet Key Exchange (IKE) messages.

  • RSA Signatures—Specifies that a public key algorithm, which supports encryption and digital signatures is used.

  • DSA Signatures—Specifies that the Digital Signature Algorithm (DSA) is used.

  • ECDSA-Signatures-256—Specifies that the Elliptic Curve DSA (ECDSA) using the 256-bit elliptic curve secp256r1, as specified in the Federal Information Processing Standard (FIPS) Digital Signature Standard (DSS) 186-3 is used.

  • ECDSA-Signatures-384—Specifies that the ECDSA using the 384-bit elliptic curve secp384r1, as specified in the FIPS DSS 186-3 is used.

Shortcut Connection Limit

Select the maximum number of shortcut tunnels that can be created with different shortcut partners using a particular gateway. The maximum number, which is also the default, is platform-dependent.

Idle Threshold

Select the rate, in packets per second, below which the shortcut is brought down.

Range: 3 through 5,000 packets per second.

Idle Time

Select the duration, in seconds, after which the shortcut is deleted if the traffic remains below the idle-threshold value.

Range: 60 seconds through 86,400 seconds.

Global Tunnel Settings

Network IP

Enter the IP address of the numbered interface. This is the subnet address from where the IP address is automatically assigned for tunnel interfaces.

Max Transmission Unit

Select the maximum transmission unit (MTU) in bytes. This defines the maximum size of an IP packet, including the IPsec overhead. You can specify the MTU value for the tunnel endpoint. The valid range is 68 to 9192 bytes. The default value is 1500 bytes.

Table 2: View or Select Devices




Select Devices as hubs.


Select Devices as spokes.


View all devices from the current and child domains, with view parent enabled. Devices from the child domain with view parent disabled are not shown.

Select hub and spoke devices.

The following filter criteria are applied for the device selection:

  • SRX Series devices mapped to Junos OS Release 12.1X46 and later Junos-es schemas are not listed.

  • Logical systems and tenant systems are not listed.

  • Routing option is not applicable.

Table 3: Device Configuration Parameters



External Interface

Select the outgoing interface for IKE security associations (SAs). This interface is associated with a zone that acts as its carrier, providing firewall security for it.

Tunnel Zone

Select the tunnel zone. They are logical areas of address space that can support dynamic IP (DIP) address pools for NAT applications to pre- and post-encapsulated IPsec traffic.

Tunnel zones also provide great flexibility in combining tunnel interfaces with VPN tunnels.


Specify the cost for an access route for the next hop.

Routing instance

Select the required routing instance.


Select a certificate to authenticate the virtual private network (VPN) initiator and recipient.

This is applicable in one of the following scenarios:

  • The VPN profile is RSA profile or ADVPN profile.

  • The authentication method is RSA-Signatures, DSA-Signatures, ECDSA-Signatures-256, or ECDSA-Signatures-384.

Trusted CA/Group

Select the certificate authority (CA) profile from the list to associate it with the local certificate.

This is applicable in one of the following scenarios:

  • The VPN profile is RSA profile or ADVPN profile.

  • The authentication method is RSA-Signatures, DSA-Signatures, ECDSA-Signatures-256, or ECDSA-Signatures-384.


The hub authenticates the spoke’s IKE ID if the subject fields of the spoke’s certificate exactly match the values configured on the hub. Multiple entries can be specified for each subject field. The order of values in the fields must match.


The hub authenticates the spoke’s IKE ID if the subject fields of the spoke’s certificate match the values configured on the hub. The wildcard match supports only one value per field. The order of the fields is inconsequential


  • Select the Static Routes check box to export static routes.

    Security Director simplifies VPN address management by enabling the administrator to export static routes to a remote site over a tunnel, allowing the static route networks to participate in the VPN. However, only devices on the hub side can export static default routes to the device side. Devices at the spoke side cannot export static default routes over a tunnel.


    For eBGP Dynamic Routing, by default, the Static Routes check box is selected.

  • Select the RIP Routes check box to export RIP routes.


    You can export RIP routes only when Routing Topology is OSPF Dynamic Routing.

  • Select the OSPF Routes check box to export OSPF routes.


    You can export OSPF routes only when Routing Topology is RIP-Dynamic Routing.

    If you select OSPF or RIP export, the OSPF or RIP routes outside the VPN network is imported into a VPN network through OSPF or RIP Dynamic routing protocols.


Select an OSPF area ID within the range of 0 to 4,294,967,295, where the tunnel interfaces of this VPN need to be configured.

This is applicable when the Routing Topology is OSPF-Dynamic Routing.

Max Retransmission Time

Select the retransmission timer to limit the number of times the RIP demand circuit re-sends update messages to an unresponsive peer. If the configured retransmission threshold is reached, routes from the next-hop router are marked as unreachable and the hold-down timer starts. You must configure a pair of RIP demand circuits for this timer to take effect.

The retransmission range is from 5 through 180 seconds and the default value is 50 seconds.


This is applicable only when Routing Topology is RIP-Dynamic Routing.

AS Number

Select a unique number to assign to the autonomous system (AS). The AS number identifies an autonomous system and enables the system to exchange exterior routing information with other neighboring autonomous systems. The valid range is from 0 through 4294967295.


This is applicable only when Routing Topology is e-BGP Dynamic Routing.

Protected Networks

Configure the addresses or interface type for the selected device to protect one area of the network from the other.

When a dynamic routing protocol is selected, the interface option is displayed.


You can also create addresses by clicking Add New Address.

Table 4: View or Edit IKE or IPsec Settings



IKE Settings

IKE Version

Select the required IKE version, either V1 or V2, that is used to negotiate dynamic security associations (SAs) for IPsec. By default, IKE V2 is used.


Select an IKE policy mode.

  • Main—Uses six messages in three peer-to-peer exchanges to establish the IKE SA. These three steps include the IKE SA negotiation, a Diffie-Hellman exchange, and authentication of the peer. Also provides identity protection.

  • Aggressive—Takes half the number of messages of main mode, has less negotiation power, and does not provide identity protection.


Mode is applicable when the IKE Version is V1.


Select the appropriate encryption mechanism.


Select an algorithm. The device uses this algorithm to verify the authenticity and integrity of a packet.

Deffie Hellman group

Select a group. Diffie-Hellman (DH) groups determine the strength of the key used in the key exchange process.


Select a lifetime of an IKE security association (SA). The valid range is from 180 through 86,400 seconds.

Dead Peer Detection

Enable to permit the two gateways to determine if the peer gateway is up and responding to the Dead Peer Detection (DPD) messages that are negotiated during IPsec establishment.

DPD Mode

Select a DPD Mode.

  • Optimized: R-U-THERE messages are triggered if there is no incoming IKE or IPsec traffic within a configured interval after the device sends outgoing packets to the peer. This is the default mode.

  • Probe Idle Tunnel: R-U-THERE messages are triggered if there is no incoming or outgoing IKE or IPsec traffic within a configured interval. R-U-THERE messages are sent periodically to the peer until there is traffic activity.

  • Always-send: R-U-THERE messages are sent at configured intervals regardless of traffic activity between the peers.

DPD Interval

Select an interval in seconds to send dead peer detection messages. The default interval is 10 seconds, with a permissible range of 2 to 60 seconds.

DPD Threshold

Select the failure DPD threshold value. This specifies the maximum number of times the DPD messages must be sent when there is no response from the peer. The default number of transmissions is 5 times, with a permissible range of 1 to 5.

Advance Configuration

General IKE ID

Enable this option to accept peer IKE ID. This option is disabled by default. If General IKE ID is enabled, the IKE ID option is disabled automatically.

IKEv2 Re Authentication

Select a reauthentication frequency. Reauthentication can be disabled by setting the reauthentication frequency to 0.

Range is 0 to 100.

IKEv2 Re Fragmentation Support

IKEv2 fragmentation splits a large IKEv2 message into a set of smaller ones so that there is no fragmentation at the IP level.

IKEv2 Re-fragment Size

Select the size of the packet at which messages are fragmented. By default, the size is 576 bytes for IPv4.

Range is 570 to 1320.


Select an option:

  • None

  • Distinguished name

  • Hostname

  • IPv4 address

  • E-mail Address

IKE ID is applicable only when General IKE ID is disabled.


Enable Network Address Translation-Traversal (NAT-T) if the dynamic endpoint is behind a NAT device.

Keep Alive

Select a value. NAT Keepalives are required to maintain the NAT translation during the connection between the VPN peers. Range is from 1 to 300 seconds.

IPSec Settings


Select the required protocol to establish the VPN.

  • ESP—The Encapsulating Security Payload (ESP) protocol provides both encryption and authentication.

  • AH—The Authentication Header (AH) protocol provides data integrity and data authentication.

Encryption Algorithm

Select the necessary encryption method.

This is applicable if the Protocol is ESP.

Authentication Algorithm

Select an algorithm. The device uses these algorithms to verify the authenticity and integrity of a packet.

Perfect Forward Secrecy

Select Perfect Forward Secrecy (PFS) as the method that the device uses to generate the encryption key. The PFS generates each new encryption key independently from the previous key. The higher numbered groups provide more security but require more processing time.

Establish Tunnel

Select an option to specify when IKE is activated.

  • Immediately—IKE is activated immediately after VPN configuration changes are committed.

  • On-traffic—IKE is activated only when data traffic flows and must be negotiated with the peer gateway. This is the default behavior.

Advance Configuration

VPN Monitor

Enable this option to send Internet Control Message Protocol (ICMP) to determine if the VPN is up.


When VPN monitoring optimization is enabled, the SRX Series device only sends ICMP echo requests (pings) when there is outgoing traffic and no incoming traffic from the configured peer, through the VPN tunnel. If there is incoming traffic through the VPN tunnel, the SRX Series device considers the tunnel to be active and does not send pings to the peer.

Anti Replay

By default, Anti-Replay detection is enabled. IPsec protects against a VPN attack by using a sequence of numbers that are built into the IPsec packet—the system does not accept a packet for which it has already seen the same sequence number. It checks the sequence numbers and enforces the check, rather than just ignoring the sequence numbers. Disable it if there is an error with the IPsec mechanism that results in out-of-order packets, preventing proper functionality.

Install interval

Select the maximum number of seconds to allow for the installation of a re-keyed outbound security association (SA) on the device.

Idle Time

Select the appropriate idle time interval. The sessions and their corresponding translations typically time out after a certain period if no traffic is received.

DF Bit

Select an option to process the Don’t Fragment (DF) bit in IP messages.

  • Clear—Disable the DF bit from the IP messages. This is the default.

  • Copy—Copy the DF bit to the IP messages.

  • Set—Enable the DF bit in the IP messages.

Copy Outer DSCP

Enable copying of Differentiated Services Code Point (DSCP) field from the outer IP header encrypted packet to the inner IP header plain text message on the decryption path. The benefit in enabling this feature is that after IPsec decryption, clear text packets can follow the inner class-of-service (CoS) rules.

Lifetime Seconds

Select a lifetime of an IKE security association (SA). The valid range is from 180 through 86,400 seconds.

Lifetime kilobytes

Select the lifetime (in kilobytes) of an IPsec security association (SA). The range is from 64 through 4294967294 kilobytes.