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TABLE OF CONTENTS
6.2.3 Set Up Windows XP or Later Client ............................................................................................................................................................108
6.2.4 Set Up Earlier Windows Clients ...................................................................................................................................................................109
6.2.5 Set Up Linux Clients .......................................................................................................................................................................................109
6.3 Dial-out Access ....................................................................................................................................................................................109
6.3.1 Always-on Dial-out .........................................................................................................................................................................................109
6.3.2 Failover Dial-out .............................................................................................................................................................................................111
6.4 OOB Broadband Ethernet Access ....................................................................................................................................................... 113
6.5 Broadband Ethernet Failover ...............................................................................................................................................................114
6.6 Cellular Modem Connection ................................................................................................................................................................116
6.6.1 Connecting to a GSM HSUPA/UMTS Carrier Network ..........................................................................................................................116
6.6.2 Connecting to a CDMA EV-DO Carrier Network ......................................................................................................................................119
6.6.3 Connecting to a 4G LTE Carrier Network ..................................................................................................................................................121
6.6.4 Verifying the Cellular Connection ...............................................................................................................................................................122
6.6.5 Cellular Modem Watchdog ..........................................................................................................................................................................124
6.6.6 Dual SIM Failover ...........................................................................................................................................................................................124
6.6.7 Multi-carrier Cellular Support ......................................................................................................................................................................125
6.7 Cellular Operation .................................................................................................................................................................................126
6.7.1 OOB Access Setup ..........................................................................................................................................................................................127
6.7.2 Cellular Failover ...............................................................................................................................................................................................128
6.7.3 Cellular Routing ...............................................................................................................................................................................................129
6.7.4 Cellular CSD Dial-in ........................................................................................................................................................................................129
6.8 Firewalls and Forwarding ....................................................................................................................................................................130
6.8.1 Configuring Network Forwarding and IP Masquerading .......................................................................................................................131
6.8.2 Configuring Client Devices ...........................................................................................................................................................................132
6.8.3 Port and Protocol Forwarding .....................................................................................................................................................................134
6.8.4 Firewall Rules ..................................................................................................................................................................................................135
6.8.5 Packet State Matching in Firewall Rules ...................................................................................................................................................137
7. SSH TUNNELS AND SDT CONNECTOR ................................................................................................................................... 139
7.1 Configuring for SSH Tunneling to Hosts .............................................................................................................................................140
7.2 SDT Connector Client Configuration ..................................................................................................................................................141
7.2.1 SDT Connector Client Installation ...............................................................................................................................................................141
7.2.2 Configuring a New Gateway in the SDT Connector Client .....................................................................................................................142
7.2.3 Auto-configure SDT Connector Client with the User’s Access Privileges ..........................................................................................143
7.2.4 Make an SDT Connection through the Gateway to a Host ................................................................................................................... 144
7.2.5 Manually Add a Host the the SDT Connector Gateway ..........................................................................................................................145
7.2.6 Manually Add New Services to the New Hosts ........................................................................................................................................146
7.2.7 Add a Client Program to be Started for the New Service .......................................................................................................................148
7.2.8 Dial-in Configuration ......................................................................................................................................................................................149
7.3 SDT Connector to Management Console ...........................................................................................................................................149
7.4 SDT Connector: Telnet or SSH Connect to Serially-Attached Devices ............................................................................................151
7.5 Using SDT Connector for Out-of-Band Connection to the Gateway .................................................................................................152
7.6 Importing and Exporting Preferences ................................................................................................................................................153
7.7 SDT Connector Public Key Authentication .........................................................................................................................................153
