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Руководство по программной части (Linux) Страница: 78

Moxa V2401-CE Руководство по программной части (Linux) онлайн [78/108] 170746

V2401/2402 Series Linux User’s Manual System Recovery

5-5

ATTENTION

Please note that some USB disks will be regarded as the Removable Device. If it happens, see

the following steps.

a. Select Removable Device Priority.

b. Make sure that the USB disk has been detected. Press Esc to exit.

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First edition march 2010 1
V2401 2402 series linux user s manual 1
Www moxa com product 1
Copyright notice 2
Disclaimer 2
Technical support contact information 2
Trademarks 2
V2401 2402 series linux user s manual 2
Www moxa com support 2
Table of contents 3
Introduction 5
Device driver 6
Hardware 6
Linux kernel 6
Micro kernel 6
Overview 6
Protocol stack 6
Software specifications 6
Software components 7
Software configuration 8
Starting from a vga console 9
Desktop display configuration 10
Connecting from a telnet console 14
Connecting from an ssh console 15
Windows users 15
Adjusting the system time 16
Linux users 16
Setting the time manually 16
Example shell script for updating the system time periodically 17
Ntp client 17
Updating the time automatically 17
Enabling and disabling daemons 18
How to run the shell script automatically when the kernel boots up 18
Setting the run level 22
Cron daemon for executing scheduled commands 23
Inserting a usb storage device into the computer 24
Apt installing and removing packages 25
Checking the linux version 25
Device suspend 27
Managing communications 28
Changing the interfaces configuration file 30
Changing the network settings 30
Static ip address 30
Adjusting ip addresses with ifconfig 31
Dynamic ip address using dhcp 31
Serial port operation mode 31
Disabling the telnet ftp server 32
Enabling the telnet ftp server 32
Telnet ftp server 32
Dns client 33
Etc hostname 33
Etc nsswitch conf 34
Etc resolv conf 34
Apache web server 35
Default homepage 35
Disabling the cgi function 35
Saving web pages to a usb storage device 36
Filter table includes three chains 38
Iptables 38
Nat table includes three chains 38
Process 38
Mangle table includes two chains 39
Sub tables 39
13 3 13 40
Iptables hierarchy 40
The following figure shows the iptables hierarchy 40
V2401 2402 series linux user s manual managing communications 40
Iptables modules 41
Define policy for chain rules 42
Observe and erase chain rules 42
Append or delete rules 43
Nat example 44
Nat network address translation 44
Enabling nat at bootup 45
Connecting to a ppp server over a simple dial up connection 46
Ppp point to point protocol 46
Checking the connection 47
Connecting to a ppp server over a hard wired link 47
Setting up a machine for incoming ppp connections 49
Nfs network file system client 54
Snmp simple network management protocol 55
Ethernet bridging for private networks on different subnets 56
Openvpn 56
Ethernet bridging for private networks on the same subnet 61
Routed ip 62
Programmer guide 64
Device api 65
Rtc real time clock 65
Example to get the baudrate 66
Example to set the baudrate 66
Baudrate inaccuracy 67
Digital i o 67
Special note 67
Dio program source code file example 69
Examples 69
Special note 69
System recovery 74
Recovery environment 75
Recovery procedure 75
In this example m is the usb disk drive number 76
A software component list 84
Software component list 84

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