Knowledge Base ZPE Systems, Inc. IPSec

            How to Configure IPSec Host to Host Tunnel with Pre-Shared Key

            Version 0.1 (02 May 2018)

            Overview

            Host to Host configurations allow two nodes to establish a tunnel between them. The encrypted communication will be limited just to the two nodes involved.


            Figure 11: Host to Host Configuration Example Details

            Host to Host with Pre-shared Key

            Required tasks:

            1. Prepare both nodes (see: How to Prepare a Nodegrid Node for IPSec)
            2. On one of the nodes create a Pre-Shared Key (see: How to create Pre-shared Keys for IPSec)
            3. Create connection configuration file in /etc/ipsec/ipsec.d/ directory as root user
            4. Fields
              Values
              Comments
              Connection name
              <String>
               
              leftid
              @West
              Identifier for the west/left site.
              Values can be:
              %left  - uses left as value
              @<STRING> - uses the string

              The leftid values is used to identify the PSK
              left
              <IP or FQDN> of the West/Left host
              Additional to an actual IP address can the following values be used. These are resolved when the service starts.
              %defaultgateway
              %eth0
              rightid
              @East
              Identifier for the East/right site.
              Values can be:
              %right  - uses left as value
              @<STRING> - uses the string The rightid values is used to identify the PSK
              right
              <IP or FQDN> of the East/Right host
              Additional to an actual IP address can the following values be used. These are resolved when the service starts.
              %defaultgateway
              %eth0
              authby
              secret
               
              auto
              start
              The setting regulates when the IPSec tunnel will be established. Following values are accepted: add (manual start), start (starts with the service), ondemand (will be established if traffic exists), ignore (connection will be ignored and not used)
              connaddrfamily
              ipv4
              Possible values are ipv4 or ipv6

              Format:

              conn 
                   connaddrfamily=ipv4
                    auto=
                    authby=secret
              
                    leftid=
                    left=FQDN>
                    rightid=
                    right=FQDN>

              Example /etc/ipsec/ipsec.d/host-to-host-psk.conf

              conn host-to-host-psk
                   connaddrfamily=ipv4
                    auto=start
                    authby=secret
              
                    leftid=@West
                    left=192.168.50.4
                    rightid=@East
                    right=192.168.58.4
            5. Create a secrets file in /etc/ipsec/ipsec.d/host-to-host-psk.secrets
            6. Fields
              Values
              Comments
              leftid
              has to match leftid in the connection configuration file
               
              rightid
              has to match rightid in the connection configuration file
               
              PSK
              Pre-Shared Key
               

              Format:

                : PSK “”

              Example for /etc/ipsec/ipsec.d/host-to-host-psk.secrets

              @West @East : PSK "z29p/x/g10cI… … … … RafMGnwTH3Bk="
            7. Copy the configuration file and the secret file to the other node.
            8. Restart IPSec service on both nodes
            9. root@ng-west:~# ipsec restart
              Redirecting to: /etc/init.d/ipsec stop
              Shutting down pluto IKE daemon
              002 shutting down
              
              Redirecting to: /etc/init.d/ipsec start
              Starting pluto IKE daemon for IPsec: .
              root@ng-west:~#
            10. Confirm that the tunnel was established
              1. Short information
              2. root@ng-west:~# ipsec whack --trafficstatus
                006 #2: "host-to-host-psk", type=ESP, add_time=1524092870, inBytes=0, outBytes=0, id='@East'
              3. More Detailed information
              4. root@ng-west:~# ipsec whack --status |grep host-to-host-psk
                ……………. 
                000 #2: "host-to-host-psk":500 STATE_QUICK_I2 (sent QI2, IPsec SA established); EVENT_SA_REPLACE in 27867s; newest IPSEC; eroute owner; isakmp#1; idle; import:admin initiate
                000 #2: "host-to-host-psk" esp.f0f258e4@192.168.58.4 esp.6d38b7cc@192.168.50.4 tun.0@192.168.58.4 tun.0@192.168.50.4 ref=0 refhim=0 Traffic: ESPin=0B ESPout=0B! ESPmax=4194303B
                000 #1: "host-to-host-psk":500 STATE_MAIN_I4 (ISAKMP SA established); EVENT_SA_REPLACE in 2426s; newest ISAKMP; lastdpd=-1s(seq in:0 out:0); idle; import:admin initiate

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