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Table of Contents
5. Firewall, Failover and OOB Access 72
5.1 Dialup Modem Connection 72
5.2 OOB Dial-In Access 72
5.2.1 Configure Dial-In PPP 73
5.2.2 Using SDT Connector Client 75
5.2.3 Set Up Windows XP or Later Client 75
5.2.4 Set Up Earlier Windows Clients 76
5.2.5 Set Up Linux Clients 76
5.3 Dial-Out Access 76
5.3.1 Always-On Dial-Out 77
5.3.2 Failover Dial-Out 78
5.4 OOB Broadband Ethernet Access 79
5.5 Broadband Ethernet Failover 80
5.6 Cellular Modem Connection 81
5.6.1 Connecting to a 4G LTE 82
Carrier Network
5.6.2 Verifying the Cellular Connection 83
5.6.3 Cellular Modem Watchdog 84
5.6.4 Dual SIM Failover 85
5.6.5 Automatic SIM Slot Detection 85
5.6.6 Multi-Carrier Cellular Support 86
5.7 Cellular Operation 87
5.7.1 Set Up OOB Access 88
5.7.2 Set Up Cellular Failover 89
5.7.3 Cellular Routing 90
5.7.4 Set Up Cellular CSD Dial-In 91
5.8 Firewall and Forwarding 92
5.8.1 Configuring Network Forwarding 92
and IP Masquerading
5.8.2 Configuring Client Devices 94
5.8.3 Port / Protocol Forwarding 96
5.8.4 Firewall Rules 98
5.8.5 Packet State Matching in 100
Firewall Rules
6. SSH Tunnels and SDT Connector 102
6.1 Configuring for SSH Tunneling 102
to Hosts
6.2 SDT Connector Client Configuration 102
6.2.1 SDT Connector Client Installation 103
6.2.2 Configuring a New Gateway in 103
the SDT Connector Client
6.2.3 Auto-Configure SDT Connector 104
Client with the User’s Access
Privileges
6.2.4 Make an SDT Connection 105
Through the Gateway to a Host
6.2.5 Manually Adding Hosts to the 105
SDT Connector Gateway
6.2.6 Manually Adding New Services 106
to the New Hosts
6.2.7 Adding a Client Program to Be 108
Started for the New Service
6.2.8 Dial-In Configuration 109
6.3 SDT Connector to Management 110
Console
6.4 SDT Connector: Telnet or SSH 111
Connect to Serially Attached Devices
6.5 Using SDT Connector for 112
Out-of-Band (OOB) Connection to
the Gateway
6.6 Importing (and Exporting) 113
Preferences
6.7 SDT Connector Public Key 113
Authentication
6.8 Setting up SDT for Remote 114
Desktop Access
6.8.1 Enable Remote Desktop on the 114
Target Windows Computer to
Be Accessed
6.8.2 Configure the Remote Desktop 115
Connection Client
6.9 SDT SSH Tunnel for VNC 116
6.9.1 Install and Configure the VNC 116
Server on the Computer to be
Accessed
6.9.2 Install, Configure and Connect 118
the VNC Viewer
6.10 Using SDT to IP Connect to Hosts 119
that are Serially Attached to the
Gateway
6.10.1 Establish a PPP Connection 120
between the Host COM Port and
Console Server
6.10.2 Set Up SDT Serial Ports on 122
Console Server
6.10.3 Set Up SDT Connector to SSH 122
Port Forward over Console Server
Serial Port
6.11 SSH Tunneling Using Other SSH 122
Clients (e.g. PuTTY)
6.12. VNC Security 125
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