Use the VPN Profiles page to configure VPN profiles that define security parameters when establishing a VPN connection. You can reuse the same profile to create more VPN tunnels. The VPN profile includes VPN proposals, VPN mode, authentication, and other parameters used in IPsec VPN. When a VPN profile is created, Junos Space creates an object in the Security Director database to represent the VPN profile. You can use this object to create either route-based or policy-based IPsec VPNs.
Note You cannot modify or delete Juniper Networks defined VPN profiles. You can only clone them and create new profiles.
Review the VPN profiles main page for an understanding of your current data set. SeeVPN Profiles Main Page Fields for field descriptions.
Read the VPN Profiles Overview topic.
To configure a VPN profile:
A new VPN profile with the predefined VPN configuration is created. You can use this object to create IPsec VPNs.
Table 284: VPN Profile Settings
Settings | Guidelines |
|---|---|
Name | Enter a unique string of alphanumeric characters, dashes and underscores; no spaces allowed; 62-character maximum. |
Description | Enter a description for the VPN profile; maximum length is 255 characters. |
| IKE Settings | |
Authentication Method | Select the required authentication method:
|
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. |
Mode | Select an IKE policy mode.
Note: Mode is applicable when the IKE Version is V1. |
Encryption-algorithm | Select the appropriate encryption mechanism. |
Authentication-algorithm | Select an algorithm. The device uses these algorithms 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. |
Lifetime-seconds | 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.
|
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. |
IKE ID | Select an option:
IKE ID is applicable only when General IKE ID is disabled. |
NAT-T | 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 | |
Protocol | Select the required protocol to establish the VPN.
|
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. |
Lifetime Seconds | Select the 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. |
Establish Tunnel | Select an option to specify when IKE is activated.
|
| Advance Configuration | |
VPN Monitor | Enable this option to send Internet Control Message Protocol (ICMP) to determine if the VPN is up. |
Optimized | Enable the Optimized option. 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 the 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.
|
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. |