IPSec VPN Site-to-Site with Strongswan (Pre shared key)

Created by Dylan van Elst, Modified on Thu, 23 Dec 2021 at 11:05 AM by Dylan van Elst

Settings mentioned below will follow the example above. Please change the settings for your network.

  1. Install a Strongswan server and use the config below:
    /etc/ipsec.conf
    config setup    # General configuration parameters
      strictcrlpolicy=no
      uniqueids = yes
      charondebug = "all"
    
    conn vpn-to-peplink    # Defines a connection
      authby=secret
      left=0.0.0.0       # Public IP of local server. 0.0.0.0 is any
      leftid=40.40.40.40     # ID of local server
      leftsubnet=192.168.3.0/24  # Subnet of local server
      right=0.0.0.0      # Public IP of remote server. 0.0.0.0 is any
      rightid=50.50.50.50     # ID of remote server
      rightsubnet=192.168.1.0/24  # Subnet of remote server
      ike=aes256-sha1-modp1536  # IKE encryption algorithms
      esp=aes256-sha1    # ESP encryption algorithms
      keyingtries=%forever
      leftauth=psk
      rightauth=psk
      keyexchange=ikev2    # IKEv1 or IKEv2
      ikelifetime=1h      # Ike lifetime
      lifetime=8h      # Phase-2 lifetime
      dpddelay=30
      dpdtimeout=120
      dpdaction=restart
      auto=start


    /etc/ipsec.secrets

    : PSK "Peplink2020"    # Pre shared key

  2. Create a IPSec profile on the Peplink router under Network/Advanced > IPsec VPN and click on New Profile. And use the config below:

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