Digi ConnectPort X4 User's Guide Page 86
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Configuration through the web interface
86
Example VPN configuration
The diagram shows a Digi Connect WAN VPN used as a primary remote site router:
How VPN tunnels work
The Digi device’s Ethernet port usually connects to a switch or hub, which then connects to other
Ethernet devices. The mobile/cellular carrier provides only one IP address to the mobile interface.
The Digi device uses Network Address Translation (NAT), where only the mobile IP address is
visible to the outside. Private IP addresses are typically used on the remote site LAN connected to
the Digi device’s Ethernet port. All outgoing traffic, except the tunneled VPN traffic, uses the
mobile IP address of the Digi device. Using the example network above, the process for initiating
VPN tunnels works like this:
1 Typically, a host or device on the remote subnet (in this case, 172.17.1.0) requests
information from a host on the main site (HQ) subnet (172.16.5.0). For example, a computer
at 172.17.1.20 needs a file from 172.16.5.100.
2 The Digi device sees the request as being on the HQ subnet and checks whether a VPN
tunnel exists between the two sites.
3 If no tunnel exists, the Digi device initiates a VPN tunnel request to its peer — the VPN
concentrator at HQ. The VPN policy settings are compared, and if they match, an IPsec
tunnel is created between the Digi device and the VPN concentrator. Traffic is encrypted as
defined in the VPN policies.
Cellular
Data Network
Digi
Connect
VPN
Internet
Remote Site HQ
166.123.99.99
209.123.123.123
PWR
OK
WIC0
ACT/CH0
ACT/CH1
WIC0
ACT/CH0
ACT/CH1
ETH
ACT
COL
VPN
Appliance
172.16 .5.0/2 4
17
2.17.1.0
/
24
172.17.1.1
Private IP Tunnel
172.16.5.1
IPSec ESP
WAN
- ConnectPort 1
- X Family 1
- User’s Guide 1
- Contents 3
- About this guide 6
- Digi contact information 7
- Introduction 8
- X products 9
- Features 10
- IP protocol support 11
- Provisioning wizard 15
- Digi SureLink™ 15
- Mobile/Cellular protocols 15
- RealPort software 16
- Modem emulation 17
- Encryption 18
- Configuration management 19
- Customization capabilities 19
- Network services 20
- Network/serial clients 22
- Configuration capabilities 23
- Configuration interfaces 24
- Digi Device Discovery utility 25
- Device Manager™ interface 26
- Web interface 28
- Command-line interface 29
- Device Manager 31
- Hardware 33
- Connector pinouts 34
- 4 analog I/O 37
- 4 digital I/O 37
- Cable fittings 39
- SIM card slots 40
- Power cable fitting 41
- Optional Ethernet hub feature 42
- Configuration 43
- IP address assignment 44
- Open the web interface 47
- Discover devices 48
- The Home page 49
- Ethernet IP settings 55
- WiFi IP settings 56
- WiFi LAN settings 56
- WiFi security settings 57
- WEP Keys 58
- DHCP server settings 60
- Network services settings 64
- Dynamic DNS update settings 67
- IP filtering settings 70
- IP forwarding settings 71
- IP Network Failover settings 74
- Socket tunnel settings 78
- General Security Settings 80
- Miscellaneous Settings 80
- Local Endpoint Type: 81
- VPN Mode: 81
- Identity settings 81
- Local Endpoint: 82
- Pre-Shared Key Settings 83
- ISAKMP Phase 1 Settings 84
- Cellular 86
- Data Network 86
- Internet 86
- Remote Site HQ 86
- IP pass-through settings 88
- Host List settings 91
- Advanced network settings 93
- Mobile (cellular) settings 99
- Mobile Settings 101
- 5 Provisioning complete 104
- SIM Selection settings 105
- GPS settings 106
- Advanced Settings 107
- Digi SureLink™ settings 109
- Update PRL settings 113
- Enable 116
- Password 116
- Notes for the table: 118
- Supported character set 119
- WiMAX settings 125
- Network Connection 126
- XBee network settings 127
- Basic Settings 129
- Device Status 129
- Device Operations 130
- Gateway firmware updates 132
- OTA firmware updates 133
- .EXT value in 139
- File type 139
- Serial port settings 141
- RealPort profile 142
- Console Management profile 142
- TCP Sockets profile 143
- When the TCP 143
- UDP Sockets profile 144
- Serial Bridge profile 144
- Local Configuration profile 144
- Modem Emulation profile 145
- Industrial Automation profile 145
- GPS Profile 145
- Custom Profile 145
- Basic serial settings 146
- Advanced serial settings 147
- Camera settings 150
- Alarm notification settings 151
- Alarm conditions 152
- Alarm configuration 153
- Enable and Disable Alarms 154
- System settings 155
- Authentication failure 161
- Cold start 161
- Link up 161
- Device Cloud settings 163
- Connection settings 164
- Mobile (Cellular) Settings: 169
- 4 Click Apply 171
- Users settings 172
- Caution 173
- Password authentication 174
- Add users 176
- User access settings 176
- User permissions settings 177
- 3 Click on User Permissions 178
- 5 Click Apply 178
- Position - GPS support 180
- Applications 182
- Digi device 184
- Digi device and click Delete 184
- RealPort Settings 187
- Ekahau Client™ 188
- Device Descriptors: 189
- Access the command line 191
- Monitoring and management 195
- Display system information 197
- Serial port information 198
- Network statistics 200
- ICMP statistics 202
- WiFi LAN statistics 203
- Device Cloud status 215
- Position/GPS statistics 215
- XBee Network 216
- Watchport Sensor statistics 218
- SureLink statistics 219
- Diagnostics 220
- Manage serial ports 221
- Manage connections 221
- Event logging 222
- Manage network services 223
- Device administration 230
- File management 231
- Secure Shell (SSH) Hostkeys 243
- Prerequisites 245
- Using the boot command 246
- Connector 247
- ConnectPort X4 H 248
- Reset button 248
- Reboot the Digi device 250
- Specifications and 252
- ConnectPort X2 specifications 253
- 4.5 in (11.4 cm) 254
- ConnectPort X4 specifications 255
- Hardware specifications 256
- Wireless networking features 257
- Infrastructure Mode 258
- Ad-Hoc Mode 258
- FCC Part 15 Class B 259
- ((( ))) 262
- ConnectPort X4 S2 2G Term 263
- ConnectPort X4 H 263
- Troubleshooting 265
- System status LEDs 266
- 1: signal strength low/weak 267
- ConnectPort X4 - Top 268
- ConnectPort X4 - Front panel 268
- ONNECT ORT 269
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