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This page intend to list bunch of scenarios for our SD-EWAN case, including the decomposed scenarios and the overall integrated scenario.



Decomposed scenarios

Decomposed Scenario A: Site-to-Site tunnel with static public IP address

In this scenario, both sites have static public IP address and setup a tunnel between sites. After the tunnel is established, the clients within the site should be able to ping the clients on the other side through the tunnel. The tunnel is authenticated through pre-shared key.

Scenario Description:

Tunnel between site A and site B
Suppose there are two sites A and B. A comes with the subnet 10.1.0.1/24, B comes with the subnet 10.2.0.1/24
Gateway for A is 192.168.1.10
Gateway for B is 192.168.1.11
A and B would like to establish a tunnel
10.1.0.1/24 == 10.2.0.1/24

CRs for the scenario

Proposal CR 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecProposal
metadata:
  name: test_proposal_1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  encryption_algorithm: aes128
  hash_algorithm: sha256
  dh_group: modp3072
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True
Sample CR for gateway A 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecSite
metadata:
  name: siteA
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: 192.168.1.11
  authentication_method: psk
  pre_shared_key: test123
  crypto_proposal: 
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      local_subnet: 10.1.0.1/24
      remote_subnet: 10.2.0.1/24
      crypto_proposal:
        - test_proposal_1
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True
Sample CR for gateway B 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecSite
metadata:
  name: siteB
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: 192.168.1.10
  authentication_method: psk
  pre_shared_key: test123
  crypto_proposal: 
    - test_proposal_1
  connections:
    - connection_name: connection_B
      type: tunnel
      mode: start
      local_subnet: 10.2.0.1/24
      remote_subnet: 10.1.0.1/24
      crypto_proposal:
        - test_proposal_1
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True

Rest calls

Sites settings

GET /cgi-bin/luci/sdewan/ipsec/v1/sites

{
    "sites": [

     {

            "name": “siteA",

            "remote":"192.168.1.11",

            "crypto_proposal": "test_proposal_1",

            "pre_shared_key": "test123",

            "authentication_method": "psk",

            "connections": [

              { "name": "connection_A",

                "type": "tunnel",

                "mode": "start",

                "local_subnet": "10.1.0.1/24",

                "remote_subnet": "10.2.0.1/24",

                "crypto_proposal": "test_proposal_1"

              }

            ]

        },

       {    "name": "siteB",

            "gateway":"192.168.1.10",

            "crypto_proposal": "test_proposal_1",

            "pre_shared_key": "test123",

            "authentication_method": "psk",

            "remote_identifier": "@moon.strongswan.org",

            "local_identifier": "@sun.strongswan.org",

            "connections": [

              { "name": "connection_B",

                "type": "tunnel",

                "mode": "start",

                "local_subnet": "10.2.0.1/24",

                "remote_subnet": "10.1.0.1/24",

                "crypto_proposal": "test_proposal_1"

              }

        ]

      }

   ]
}

Proposal settings

GET /cgi-bin/luci/sdewan/ipsec/v1/proposals

{ "proposals": [

           {

              "name": "proposal1",

              "crypto_algorithm": "aes128",

              "hash_algorithm": "sha256",

              "dh_group": "modp3072"

           }

     ]

}

Decomposed Scenario B: Host-to-Site tunnel when the initiator requests an overlay IP

In this scenario, the initiator sends out a request to the responder(either a site gateway/remote host) which has a static public ip address(or dynamic pubic IP with static domain name) in order to setup a tunnel between. However, this time, the roadwarrior is also going to ask for a virtual IP that assigned by the responder. After the tunnel is established, the roadwarrior should be able to get an overlay IP and ping the clients on the other side through the tunnel. The tunnel is authenticated through pre-shared key.

Scenario Description:

Tunnel between site A and host B(Responder and Initiator)
Suppose there is one site A and one host B. A comes with the subnet 10.1.0.1/24.
Gateway for A is 192.168.1.10 which is a public ip address
Host B has no public address and want to request one from the peer(suppose the vip assigned is 10.3.0.12)
A and B would like to establish a tunnel
10.1.0.1/24 == 10.3.0.12/32

CRs for the scenario

Proposal CR 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecProposal
metadata:
  name: test_proposal_1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  encryption_algorithm: aes128
  hash_algorithm: sha256
  dh_group: modp3072
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True
Sample CR for gateway A 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecSite
metadata:
  name: siteA
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: %any
  authentication_method: psk
  pre_shared_key: test
  crypto_proposal: 
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      local_subnet: 10.1.0.1/24
      remote_sourceip: 10.3.0.1/24
      crypto_proposal:
        - test_proposal_1
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True
Sample CR for host B 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecHost
metadata:
  name: hostB
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: 192.168.1.10
  authentication_method: psk
  pre_shared_key: test
  crypto_proposal: 
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      local_sourceip: %config
      remote_subnet: 0.0.0.0/0
      crypto_proposal:
        - test_proposal_1 
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True


Rest calls

Sites settings

GET /cgi-bin/luci/sdewan/ipsec/v1/sites

{
    "sites": [

       {    "name": "siteA",

            "remote":"%any",

            "crypto_proposal": "test_proposal_1",

            "pre_shared_key": "test123",

            "authentication_method": "psk",

            "local_identifier": "@moon.strongswan.org",

            "remote_identifier": "@sun.strongswan.org",

            "connections": [

              { "name": "connA",

                "type": "tunnel",

                "mode": "start",

                "local_subnet": "10.1.0.1/24",

                "remote_sourceip": "10.3.0.1/24",

                "crypto_proposal": "test_proposal_1"

              }

            ]

        },

       {    "name": "hostB",

            "remote":"192.168.1.10",

            "crypto_proposal": "test_proposal_1",

            "pre_shared_key": "test123",

            "authentication_method": "psk",

            "remote_identifier": "@moon.strongswan.org",

            "local_identifier": "@sun.strongswan.org",

            "connections": [

              { "name": "connA",

                "type": "tunnel",

                "mode": "start",

                "local_sourceip": "%config",

                "remote_subnet": "10.1.0.1/24",

                "crypto_proposal": "test_proposal_1"

              }

        ]

      }

   ]
}

Proposal settings

GET /cgi-bin/luci/sdewan/ipsec/v1/proposals

{ "proposals": [

        {

              "crypto_algorithm": "aes128",

              "hash_algorithm": "sha256",

              "dh_group": "modp3072"

         }

     ]

}

Decomposed Scenario C: Host to host tunnel

Setup a tunnel between the host who got assigned the virtual IP and another host with PIP.

Scenario Description:

Tunnel between host A and host B
Suppose there are two hosts A and B.
A has a public ip which is 192.168.3.1
B is a host which already get a vip 10.3.0.12
A and B would like to establish a tunnel
192.168.3.1/32 == 10.3.0.12/32

CRs for the scenario

Proposal CR 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecProposal
metadata:
  name: test_proposal_1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  encryption_algorithm: aes128
  hash_algorithm: sha256
  dh_group: modp3072
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True
Sample CR for host A 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecHost
metadata:
  name: hostA
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: %any
  authentication_method: psk
  pre_shared_key: test
  crypto_proposal: 
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      remote_sourceip: 10.3.0.12
      crypto_proposal:
        - test_proposal_1 
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True
Sample CR for host B 
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecHost
metadata:
  name: hostB
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: 192.168.3.1
  authentication_method: psk
  pre_shared_key: test
  crypto_proposal: 
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      local_sourceip: 10.3.0.13
      crypto_proposal:
        - test_proposal_1 
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True


Rest calls

Sites settings

GET /cgi-bin/luci/sdewan/ipsec/v1/sites

{
    "sites": [

       {    "name": "hostA",

            "remote":"%any",

            "crypto_proposal": "test_proposal_1",

            "pre_shared_key": "test123",

            "authentication_method": "psk",

            "local_identifier": "@moon.strongswan.org",

            "remote_identifier": "@sun.strongswan.org",

            "connections": [

              { "name": "connA",

                "type": "tunnel",

                "mode": "start",

                "remote_sourceip": "10.3.0.12",

                "crypto_proposal": "test_proposal_1"

              }

            ]

        },

       {    "name": "hostB",

            "remote":"192.168.3.1",

            "crypto_proposal": "test_proposal_1",

            "pre_shared_key": "test123",

            "authentication_method": "psk",

            "remote_identifier": "@moon.strongswan.org",

            "local_identifier": "@sun.strongswan.org",

            "connections": [

              { "name": "connA",

                "type": "tunnel",

                "mode": "start",

                "local_sourceip": "10.3.0.12",

                "crypto_proposal": "test_proposal_1"

              }

        ]

      }

   ]
}

Proposal settings

GET /cgi-bin/luci/sdewan/ipsec/v1/proposals

{ "proposals": [

        {

              "crypto_algorithm": "aes128",

              "hash_algorithm": "sha256",

              "dh_group": "modp3072"

         }

     ]

}

Targeted Scenarios

Scenario A: Edge to traffic hub tunnel where inter micro-service communication across edges that attached to same traffic hub.

Sample CR for edgeA 
CR for sdewan cnf on edgeA:

apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecHost
metadata:
  name: edgeA
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: 10.239.160.22
  authentication_method: psk
  pre_shared_key: test
  crypto_proposal:
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      local_sourceip: %config
      remote_subnet: 0.0.0.0/0, 10.239.160.22/32
      crypto_proposal:
        - test_proposal_1
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True
Sample CR for edgeB 
CR on sdewan cnf on edgeB:

apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecHost
metadata:
  name: edgeB
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: 10.239.160.22
  authentication_method: psk
  pre_shared_key: test
  crypto_proposal:
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      local_sourceip: %config
      remote_subnet: 0.0.0.0/0, 10.239.160.22/32
      crypto_proposal:
        - test_proposal_1
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True
Sample CR for Hub 
CR on sdewan on hub:

apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecSite
metadata:
  name: Hub
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: %any
  authentication_method: psk
  pre_shared_key: test
  crypto_proposal:
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      local_subnet: 172.12.0.1/24,10.239.160.22/32
      remote_sourceip: 172.12.0.1/24
      crypto_proposal:
        - test_proposal_1
status:
  appliedVersion: "1"
  appliedTime: "2020-04-12T09:28:38Z"
  inSync: True

Scenario B: Inter hub secure traffic tunnels

Overall Scenarios

Here shows the overall scenario we want to achieve in the ICN SDEWAN case.

The first step would be the edge initialization. The edges will try to connect to the central Secure WAN hub through the IPsec tunnel. There could be different scenarios containing the decomposed ones listed above:

(a) Initiator to Responder tunnels where there is edge one side with public IP address(or dynamic pubic IP with static domain name). Later, using DNAT to deliver the information to pods inside the cluster.

(b) Initiator to Responder tunnels to get overlay IP address, where the edge initiator don't have public IP address. Later, using DNAT to deliver the information to pods inside the cluster.

Next, the edges would use the virtual IPs/public IPs to setup IPSec tunnels with other clusters. In some cases, they need to go through the SD-EWAN CNF inside the Secure WAN Hub as Spoke and Hub to communicate with each other. 

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