Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
 

Configuring VPN on a Device Running Junos OS

This section describes sample configurations of an IPsec VPN on a Junos OS device using the following IKE authentication methods:

Configuring VPN on a Device Running Junos OS Overview

This section describes sample configurations of an IPsec VPN on a Junos OS device using the following IKE authentication methods:

Figure 1 illustrates the VPN topology used in all the examples described in this section. Here, H0 and H1 are the host PCs, R0 and R2 are the two endpoints of the IPsec VPN tunnel, and R1 is a router to route traffic between the two different networks.

Note:

The router R1 can be a Linux-based router, a Juniper Networks device, or any other vendor router.
Figure 1: VPN Topology VPN Topology

Table 1 provides a complete list of the supported IKE protocols, tunnel modes, Phase 1 negotiation mode, authentication method or algorithm, encryption algorithm, DH groups supported for the IKE authentication and encryption (Phase1, IKE Proposal), and for IPsec authentication and encryption (Phase2, IPsec Proposal). The TOE only operates in tunnel mode by default. No separate configuration is needed for IPSec.

Table 1: VPN Combination Matrix

IKE Protocol

Tunnel Mode

Phase1 Negotiation Mode

Phase 1 Proposal (P1, IKE)

Authentication Method

Authentication Algorithm

DH Group

Encryption Algorithm

IKEv1

Main

Route

pre-shared-keys

sha-256

group14

3des-cbc

IKEv2

    

rsa-signatures-2048

sha-384

group19

aes-128-cbc
     

ecdsa-signatures-256

  

group20

aes-128-gcm
     

ecdsa-signatures-384

  

group24

aes-192-cbc
           

aes-256-cbc
           

aes-256-gcm
             

IKE Protocol

Tunnel Mode

Phase1 Negotiation Mode

Phase 2 Proposal (P2, IPsec)

Authentication Algorithm

DH Group (PFS)

Encryption Method

Encryption Algorithm

IKEv1

Main

Route

hmac-sha256-128

group14

ESP

aes-128-cbc

IKEv2

    

group19

  

aes-128-gcm
       

group20

  

aes-192-cbc
       

group24

  

aes-192-gcm
           

aes-256-cbc
           

aes-256-gcm
             
Note:

The following sections provide sample configurations of IKEv1 IPsec VPN examples for selected algorithms. Authentication and encryption algorithms can be replaced in the configurations to accomplish the user’s desired configurations. Use set security ike gateway <gw-name> version v2-only command for IKEv2 IPsec VPN.

Configuring an IPsec VPN with a Preshared Key for IKE Authentication

In this section, you configure devices running Junos OS for IPsec VPN using a preshared key as the IKE authentication method. The algorithms used in IKE or IPsec authentication or encryption is shown in Table 2

Table 2: IKE or IPsec Authentication and Encryption

IKE Protocol

Tunnel Mode

Phase1 Negotiation Mode

Phase 1 Proposal (P1, IKE)

Authentication Method

Authentication Algorithm

DH Group

Encryption Algorithm

IKEv1

Main

Route

pre-shared-keys

sha-256

group14

aes-256-cbc

IKE Protocol

Tunnel Mode

Phase1 Negotiation Mode

Phase 2 Proposal (P2, IPsec)

Authentication Algorithm

DH Group (PFS)

Encryption Method

Encryption Algorithm

IKEv1

Main

Route

hmac-sha-256-128

group14

ESP

aes-256-cbc
Note:

A device running Junos OS uses certificate-based authentication or preshared keys for IPsec. TOE accepts ASCII preshared or bit-based keys up to 255 characters (and their binary equivalents) that contain uppercase and lowercase letters, numbers, and special characters such as !, @, #, $, %, ^, &, *, (, and ). The device accepts the preshared text keys and converts the text string into an authentication value as per RFC 2409 for IKEv1 or RFC 4306 for IKEv2, using the PRF that is configured as the hash algorithm for the IKE exchanges. The Junos OS does not impose minimum complexity requirements for preshared keys. Hence, users are advised to carefully choose long preshared keys of sufficient complexity.

Configuring IPsec VPN with Preshared Key as IKE Authentication on the Initiator

To configure the IPsec VPN with preshared key IKE authentication on the initiator:

  1. Configure the IKE proposal.

    Here, ike-proposal1 is the IKE proposal name given by the authorized administrator.

  2. Configure the IKE policy.

    Here, ike-policy1 is the IKE policy name and ike-proposal1 is the IKE proposal name given by the authorized administrator. You must enter and reenter the preshared key when prompted. For example, the preshared key can be CertSqa@jnpr2014.

    The preshared key can alternatively be entered in hexadecimal format. For example:

    Here, the hexadecimal preshared key can be cc2014bae9876543.

  3. Configure the IPsec proposal.

    Here, ipsec-proposal1 is the IPsec proposal name given by the authorized administrator.

  4. Configure the IPsec policy.

    Here, ipsec-policy1 is the IPsec policy name and ipsec-proposal1 is the IPsec proposal name given by the authorized administrator.

  5. Configure the IKE.

    Here, gw1 is an IKE gateway name, 192.0.2.8 is the peer VPN endpoint IP, 192.0.2.5 is the local VPN endpoint IP, and ge-0/0/2 is a local outbound interface as the VPN endpoint. The following additional configuration is also needed in the case of IKEv2

  6. Configure the VPN.

    Here, vpn1 is the VPN tunnel name given by the authorized administrator.

  7. Configure the outbound flow policies.

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  8. Configure the inbound flow policies.

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  9. Commit your configuration.

Configuring IPsec VPN with Preshared Key as IKE Authentication on the Responder

To configure the IPsec VPN with preshared key IKE authentication on the responder:

  1. Configure the IKE proposal.

    Note:

    Here, ike-proposal1 is the IKE proposal name given by the authorized administrator.

  2. Configure the IKE policy.

    Note:

    Here, ike-policy1 is the IKE policy name and ike-proposal1 is the IKE proposal name given by the authorized administrator.
    Note:

    You must enter and reenter the preshared key when prompted. For example, the preshared key can be CertSqa@jnpr2014.
    Note:

    The pre-share key could alternatively be entered in hexadecimal format. For example,

    Here, the hexadecimal preshared key can be cc2014bae9876543.

  3. Configure the IPsec proposal.

    Note:

    Here, ipsec-proposal1 is the IPsec proposal name given by the authorized administrator.

  4. Configure the IPsec policy.

    Note:

    Here, ipsec-policy1 is the IPsec policy name and ipsec-proposal1 is the IPsec proposal name given by the authorized administrator.

  5. Configure the IKE.

    Note:

    Here, gw1 is an IKE gateway name, 192.0.2.5 is the peer VPN endpoint IP, 192.0.2.8 is the local VPN endpoint IP. ge interfaces are the logical interfaces used for VPN functions and ge-0/0/2 is a local outbound interface as the VPN endpoint. The following additional configuration is also needed in the case of IKEv2.

  6. Configure the VPN.

    Note:

    Here, vpn1 is the VPN tunnel name given by the authorized administrator.

  7. Configure the outbound flow policies.

    Note:

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  8. Configure the inbound flow policies.

    Note:

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  9. Commit your configuration.

Configuring an IPsec VPN with an RSA Signature for IKE Authentication

In this section, you configure devices running Junos OS for IPsec VPN using an RSA signature with the IKE authentication method. To validate certificates, the TOE extracts the subject, issuer, subject's public key, signature, basicConstraints and validity period fields. If any fields are not present, the validation fails. The issuer is looked up in the PKI database. If the issuer is not present, or if the issuer certificate does not have the CA:true flag in the basicConstraints section, the validation fails. The TOE verifies the validity of the signature. If the signature is not valid, the validation fails. It then confirms that the current date and time is within the valid time period specified in the certificate if the TOE has been configured to perform a revocation check using CRL (as specified in RFC 5280 Section 6.3). If the CRL fails to download, the certificate is considered to have failed validation, unless the option to skip CRL checking on download failure has been enabled. The algorithms used in IKE or IPsec authentication or encryption is shown in Table 3.

Table 3: IKE/IPsec Authentication and Encryption

IKE Protocol

Tunnel Mode

Phase1 Negotiation Mode

Phase 1 Proposal (P1, IKE)

Authentication Method

Authentication Algorithm

DH Group

Encryption Algorithm

IKEv1

Main

Route

rsa-signatures-2048

sha-256

group19

aes-128-cbc

IKE Protocol

Tunnel Mode

Phase1 Negotiation Mode

Phase 2 Proposal (P2, IPsec)

Authentication Algorithm

DH Group (PFS)

Encryption Method

Encryption Algorithm

IKEv1

Main

Route

hmac-sha-256-128

group19

ESP

aes-128-cbc

Configuring IPsec VPN with RSA Signature as IKE Authentication on the Initiator or Responder

To configure the IPsec VPN with RSA signature IKE authentication on the initiator:

  1. Configure the PKI. See Example: Configuring PKI.

  2. Generate the RSA key pair. See Example: Generating a Public-Private Key Pair.

  3. Generate and load the CA certificate. See Example: Loading CA and Local Certificates Manually.

  4. Load the CRL. See Example: Manually Loading a CRL onto the Device .

  5. Generate and load a local certificate. See Example: Loading CA and Local Certificates Manually.

  6. Configure the IKE proposal.

    Note:

    Here, ike-proposal1 is the name given by the authorized administrator.

  7. Configure the IKE policy.

    Note:

    Here, ike-policy1 IKE policy name given by the authorized administrator.

  8. Configure the IPsec proposal.

    Note:

    Here, ipsec-proposal1 is the name given by the authorized administrator.

  9. Configure the IPsec policy.

    Note:

    Here, ipsec-policy1 is the name given by the authorized administrator.

  10. Configure the IKE.

    Note:

    Here, 192.0.2.8 is the peer VPN endpoint IP, 192.0.2.5 is the local VPN endpoint IP, and fe-0/0/1 is the local outbound interface as VPN endpoint. The following configuration is also needed for IKEv2.

  11. Configure VPN.

    Note:

    Here, vpn1 is the VPN tunnel name given by the authorized administrator.

  12. Configure the outbound flow policies.

    Note:

    Here, trustZone and untrustZone are preconfigured security zone and trustLan and untrustLan are preconfigured network addresses.

  13. Configure the inbound flow policies.

    Note:

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  14. Commit the configuration.

Configuring an IPsec VPN with an ECDSA Signature for IKE Authentication

In this section, you configure devices running Junos OS for IPsec VPN using an ECDSA signature with the IKE authentication method. To validate certificates, the TOE extracts the subject, issuer, subject's public key, signature, basicConstraints and validity period fields. If any fields are not present, the validation fails. The issuer is looked up in the PKI database. If the issuer is not present, or if the issuer certificate does not have the CA:true flag in the basicConstraints section, the validation fails. The TOE verifies the validity of the signature. If the signature is not valid, the validation fails. It then confirms that the current date and time is within the valid time period specified in the certificate if the TOE is configured to perform a revocation check using CRL (as specified in RFC 5280 Section 6.3). If the CRL fails to download, the certificate is considered to have failed validation, unless the option to skip CRL checking on download failure has been enabled. The algorithms used in IKE or IPsec authentication or encryption are shown in Table 4.

Table 4: IKE or IPsec Authentication and Encryption

IKE Protocol

Tunnel Mode

Phase1 Negotiation Mode

Phase 1 Proposal (P1, IKE)

Authentication Method

Authentication Algorithm

DH Group

Encryption Algorithm

IKEv1

Main

Route

ecdsa-signatures-256

sha-384

group14

aes-256-cbc

IKE Protocol

Tunnel Mode

Phase1 Negotiation Mode

Phase 2 Proposal (P2, IPsec)

Authentication Algorithm

DH Group (PFS)

Encryption Method

Encryption Algorithm

IKEv1

Main

Route

No Algorithm

group14

ESP

aes-256-gcm

Configuring IPsec VPN with ECDSA signature IKE authentication on the Initiator

To configure the IPsec VPN with ECDSA signature IKE authentication on the initiator:

  1. Configure the PKI. See Example: Configuring PKI.

  2. Generate the RSA key pair. See Example: Generating a Public-Private Key Pair.

  3. Generate and load the CA certificate. See Example: Loading CA and Local Certificates Manually.

  4. Load the CRL. See Example: Manually Loading a CRL onto the Device .

  5. Generate and load a local certificate. See Example: Loading CA and Local Certificates Manually.

  6. Configure the IKE proposal.

    Note:

    Here, ike-proposal1 is the IKE proposal name given by the authorized administrator.

  7. Configure the IKE policy.

  8. Configure the IPsec proposal.

    Note:

    Here, ipsec-proposal1 is the IPsec proposal name given by the authorized administrator.

  9. Configure the IPsec policy.

    Note:

    Here, ipsec-policy1 is the IPsec policy name and ipsec-proposal1 is the IPsec proposal name given by the authorized administrator.

  10. Configure IKE.

    Note:

    Here, gw1 is an IKE gateway name, 192.0.2.8 is the peer VPN endpoint IP, 192.0.2.5 is the local VPN endpoint IP, and ge-0/0/2 is a local outbound interface as the VPN endpoint. The following configuration is also needed for IKEv2.

  11. Configure the VPN.

    Note:

    Here, vpn1 is the VPN tunnel name given by the authorized administrator.

  12. Configure the outbound flow policies.

    Note:

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  13. Configure the inbound flow policies.

    Note:

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  14. Commit your configuration.

Configuring IPsec VPN with ECDSA signature IKE authentication on the Responder

To configure IPsec VPN with ECDSA signature IKE authentication on the responder:

  1. Configure the PKI. See Example: Configuring PKI.

  2. Generate the ECDSA key pair. See Example: Generating a Public-Private Key Pair.

  3. Generate and load the CA certificate. See Example: Loading CA and Local Certificates Manually.

  4. Load the CRL. See Example: Manually Loading a CRL onto the Device .

  5. Configure the IKE proposal.

    Note:

    Here, ike-proposal1 is the IKE proposal name given by the authorized administrator.

  6. Configure the IKE policy.

  7. Configure the IPsec proposal.

    Note:

    Here, ipsec-proposal1 is the IPsec proposal name given by the authorized administrator.

  8. Configure the IPsec policy.

    Note:

    Here, ipsec-policy1 is the IPsec policy name and ipsec-proposal1 is the IPsec proposal name given by the authorized administrator.

  9. Configure the IKE.

    Note:

    Here, gw1 is an IKE gateway name, 192.0.2.5 is the peer VPN endpoint IP, 192.0.2.8 is the local VPN endpoint IP, and ge-0/0/1 is a local outbound interface as the VPN endpoint. The following configuration is also needed for IKEv2.

  10. Configure the VPN.

    Note:

    Here, vpn1 is the VPN tunnel name given by the authorized administrator.

  11. Configure the outbound flow policies.

    Note:

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  12. Configure the inbound flow policies.

    Note:

    Here, trustZone and untrustZone are preconfigured security zones and trustLan and untrustLan are preconfigured network addresses.

  13. Commit your configuration.

Configuring Remote IKE IDs

By default, the IKE ID received from the peer is validated with the IP address configured for the IKE gateway. In certain network setups, the IKE ID received from the peer (the IKE ID can be an IPv4 or IPv6 address, email id, fully qualified domain name (FQDN), or a distinguished name) does not match the IKE gateway configured on the device. This can lead to a Phase 1 validation failure.

To configure the IKE ID perform the following steps:
  1. Configure the remote-identity statement at the set security ike gateway gateway-name hierarchy level to match the IKE ID that is received from the peer. The IKE ID values can be an IPv4 address or an IPv6 address, email id, FQDN, or a distinguished name.
  2. On the peer device, ensure that the IKE ID is the same as the remote-identity configured on the device. If the peer device is a Junos OS device, configure the local-identity statement at the set security ike gateway gateway-name hierarchy level. The IKE ID values can be an IPv4 address or an IPv6 address, email id, FQDN, or a distinguished name.

See Also