USG Pro4 Site by Site Vpn Fritzbox

{
    "vpn": {
        "ipsec": {
            "auto-firewall-nat-exclude": "enable",
            "auto-update": "60",
            "esp-group": {
                "ESP-Fritzbox": {
                    "compression": "disable",
                    "lifetime": "3600",
                    "mode": "tunnel",
                    "pfs": "enable",
                    "proposal": {
                        "1": {
                            "encryption": "aes256",
                            "hash": "sha1"
                        }
                    }
                }
            },
            "ike-group": {
                "IKE-Fritzbox": {
                    "ikev2-reauth": "no",
                    "key-exchange": "ikev1",
                    "lifetime": "3600",
                    "proposal": {
                        "1": {
                            "dh-group": "2",
                            "encryption": "aes256",
                            "hash": "sha1"
                        }
                    }
                }
            },
            "ipsec-interfaces": {
                "interface": [
                    "eth0"
                ]
            },
            "nat-networks": {
                "allowed-network": {
                    "0.0.0.0/0": "''"
                }
            },
            "nat-traversal": "enable",
            "site-to-site": {
                "peer": {
                    "fritzbox,de": {
                        "authentication": {
                            "id": "usg.de",
                            "mode": "pre-shared-secret",
                            "pre-shared-secret": "test123",
                            "remote-id": "fritzbox.de"
                        },
                        "connection-type": "initiate",
                        "ike-group": "IKE-Fritzbox",
                        "ikev2-reauth": "inherit",
                        "local-address": "any",
                        "tunnel": {
                            "1": {
                                "allow-nat-networks": "disable",
                                "allow-public-networks": "disable",
                                "esp-group": "ESP-Fritzbox",
                                "local": {
                                    "prefix": "192.168.2.0/24"
                                },
                                "remote": {
                                    "prefix": "192.168.123.0/24"
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

vpncfg {
connections {
        enabled = yes;
        conn_type = conntype_lan;
        name = "USGMK";
        always_renew = yes;
        reject_not_encrypted = no;
        dont_filter_netbios = yes;
        localip = 0.0.0.0;
        local_virtualip = 0.0.0.0;
        remoteip = 0.0.0.0;
        remote_virtualip = 0.0.0.0;
        remotehostname = "usg.de"; //Hostname of your USG
        keepalive_ip = 0.0.0.0;
        localid {
            fqdn = "Fritzbox.de";
        }
        remoteid {
            ipaddr = "usg.de";
        }
        mode = phase1_mode_idp;
        phase1ss = "all/all/all";
        keytype = connkeytype_pre_shared;
        key = "test123";
        cert_do_server_auth = no;
        use_nat_t = yes;
        use_xauth = no;
        use_cfgmode = no;
        phase2localid {
            ipnet {
                ipaddr = 192.168.123.0;
                mask = 255.255.255.0;
            }
        }
        phase2remoteid {
            ipnet {
                ipaddr = 192.168.2.0;
                mask = 255.255.255.0;
            }
        }
        phase2ss = "esp-all-all/ah-none/comp-all/pfs";
        accesslist = "permit ip any 192.168.2.0 255.255.255.0";

    }
    ike_forward_rules = "udp 0.0.0.0:500 0.0.0.0:500",
              "udp 0.0.0.0:4500 0.0.0.0:4500";
            
}