Moxa DA-685-LX Инструкция по эксплуатации онлайн [3/76] 170556

Table of Contents
1. Introduction ...................................................................................................................................... 1-1
Overview ........................................................................................................................................... 1-2
Software Specifications........................................................................................................................ 1-2
Software Components ......................................................................................................................... 1-2
2. Software Configuration ..................................................................................................................... 2-1
The Read-only file system .................................................................................................................... 2-2
Starting from a VGA Console ................................................................................................................ 2-2
Connecting from a Telnet Console ......................................................................................................... 2-3
Connecting from an SSH Console .......................................................................................................... 2-4
Windows Users ........................................................................................................................... 2-4
Linux Users ................................................................................................................................ 2-4
Adjusting the System Time .................................................................................................................. 2-4
Setting the Time Manually ............................................................................................................ 2-5
NTP Client .................................................................................................................................. 2-5
Updating the Time Automatically ................................................................................................... 2-6
Enabling and Disabling Daemons .......................................................................................................... 2-6
Setting the Run-Level .......................................................................................................................... 2-9
CronDaemon for Executing Scheduled Commands ................................................................................ 2-9
Inserting a USB Storage Device into the Computer ............................................................................... 2-10
Inserting a Compact Flash card .......................................................................................................... 2-11
Checking the Linux Version ................................................................................................................ 2-11
APTInstalling and Removing Packages .............................................................................................. 2-11
3. Managing Communications ............................................................................................................... 3-1
Detecting Network Interfaces ............................................................................................................... 3-2
Changing the Network Settings ............................................................................................................ 3-2
Changing the “interfaces” Configuration File ................................................................................... 3-2
Adjusting IP Addresses with “ifconfig” ............................................................................................ 3-3
Telnet/FTP Server ............................................................................................................................... 3-3
DNS Client ......................................................................................................................................... 3-4
Apache Web Server ............................................................................................................................. 3-6
Default Homepage ....................................................................................................................... 3-6
Disabling the CGI Function ........................................................................................................... 3-6
Saving Web Pages to a USB Storage Device .................................................................................... 3-7
IPTABLES .......................................................................................................................................... 3-9
IPTABLES Hierarchy ................................................................................................................... 3-10
IPTABLES Modules ..................................................................................................................... 3-10
Observe and Erase Chain Rules ................................................................................................... 3-11
Define Policy for Chain Rules ....................................................................................................... 3-12
Append or Delete Rules .............................................................................................................. 3-12
NAT (Network Address Translation) ..................................................................................................... 3-13
NAT Example ............................................................................................................................ 3-13
Enabling NAT at Bootup .............................................................................................................. 3-14
PPP (Point to Point Protocol) ............................................................................................................... 3-14
Connecting to a PPP Server over a Simple Dial-up Connection ......................................................... 3-15
Connecting to a PPP Server over a Hard-wired Link ........................................................................ 3-16
Checking the Connection ............................................................................................................ 3-16
Setting up a Machine for Incoming PPP Connections ...................................................................... 3-17
PPPoE .............................................................................................................................................. 3-18
NFS (Network File System) Client ....................................................................................................... 3-21
SNMP (Simple Network Management Protocol) ..................................................................................... 3-21
OpenVPN ......................................................................................................................................... 3-22
Ethernet Bridging for Private Networks on Different Subnets ........................................................... 3-22
Ethernet Bridging for Private Networks on the Same Subnet ........................................................... 3-25
Routed IP ................................................................................................................................. 3-26
4. Programmer Guide ............................................................................................................................ 4-1
RTC (Real Time Clock) ......................................................................................................................... 4-2
UART ................................................................................................................................................ 4-2
WDT (Watch Dog Timer) ...................................................................................................................... 4-2
Programmable LEDs ............................................................................................................................ 4-4
5. System Recovery ............................................................................................................................... 5-1
Recovery Environment ........................................................................................................................ 5-2
Recovery Procedure ............................................................................................................................ 5-2
Saving the System to the USB Drive ................................................................................................... 5-10
A. Software Components ....................................................................................................................... A-1

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