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Moxa IA261-I-T-LX [28/71] Managing communications

Chapter 4 Managing Communications

In this chapter, we explain how to configure the IA260/IA261/IA262/EM-2260’s various

communication functions.

The following topics are covered in this chapter:

 Telnet / FTP

 DNS

 Web Service—Apache

 Install PHP for Apache Web Server

 IPTABLES

 NAT

¾ NAT Example

¾ Enabling NAT at Bootup

 Dial-up Service—PPP

 PPPoE

 NFS (Network File System)

¾ Setting up the IA260/IA261/IA262/EM-2260 as an NFS Client

 Mail

 SNMP

 OpenVPN

Содержание

First edition january 2009 1
Ia260 ia261 ia262 em 2260 linux user s manual 1
Www moxa com product 1
Copyright notice 2
Disclaimer 2
Ia260 ia261 ia262 em 2260 linux user s manual 2
Technical support contact information www moxa com support 2
Trademarks 2
Table of contents 3
Introduction 5
Overview 6
Software architecture 6
Journaling flash file system jffs2 7
Software package 8
Getting started 9
Connecting the ia260 ia261 ia262 em 2260 to a pc 10
Debug port 10
Powering on the ia260 ia261 ia262 em 2260 10
Telnet console 11
Ssh console 12
Windows users 12
Linux users 13
Configuring the ethernet interface 14
Modifying network settings 14
Vga console 14
Cf socket for storage expansion 15
Modifying network settings by command 15
Test program developing hello c 15
Checking the flash memory space 16
Installing the tool chain linux 16
Compiling hello c 17
Uploading and running the hello program 17
Managing embedded linux 18
System version information 19
Upgrading the firmware 19
Attention 21
Ia260 261 262 em 2260 lx user s manual managing embedded linux 21
Next use the upgradehfm command to upgrade the kernel and root file system 21
The upgradehfm utility will reboot your target after the upgrade is ok 21
Enabling and disabling daemons 22
Ia260 261 262 em 2260 lx user s manual managing embedded linux 22
Loading factory defaults 22
Snmpd snmp agent daemon telnetd telnet server daemon and client inetd internet daemons ftpd ftp server daemon and client sshd secure shell server daemon httpd apache www server daemon 22
The following daemons are enabled when the ia260 ia261 ia262 em 2260 boots up for the first time 22
To load the factory default settings you must press the reset to default button for more than 5 seconds all files in the home etc directories will be deleted note that while pressing the reset to default button the ready led will blink three times and then turn off it takes about one minute for the factory defaults to fully load for users who have logged onto the computer please note that they will be forcibly logged out when the factory defaults are loaded and the systems start to reboot 22
Type the command ps to list all processes currently running 22
Ia260 261 262 em 2260 lx user s manual managing embedded linux 23
Next use vi to open your application script we use the example program tcps2 release and put it to run in the background 23
The enabled daemons will be available after you reboot the system 23
To run a private daemon you can edit the file rc local as follows 23
Setting the run level 24
Adjusting the system time 25
Setting the time manually 25
Ntp client 26
Updating the time automatically 26
Cron daemon to execute scheduled commands 27
Managing communications 28
Telnet ftp 29
Web service apache 30
Ia260 261 262 em 2260 lx user s manual managing communications 32
Install php for apache web server 32
Step 1 check that you have enough free space 32
Step 2 type upramdisk to get the free space ram disk to save the package 32
Step 3 download the php package from the cd rom you can find the package in cd rom utility_tools libmysqlclientx_x x xx_xxxxxx ipk and rom utility_tools libphpx_x x x_xxxxxx ipk where x indicates the version and cpu model 32
Step 4 run ipkg cl install libmysqlclient5_5 3_arm ipk and then run ipkg cl install libphp5_5 _arm ipk to install php 32
Step 5 test it use the browser to access http 192 68 27 phpinfo php 32
This embedded computer supports the php option however since the php file is 3 mb it is not installed by default to install it yourself first make sure there is enough free space at least 3 mb on your embedded flash rom 32
To check that the dev mtdblock3 free space is greater than 3 mb 32
Iptables 34
Ia260 261 262 em 2260 lx user s manual managing communications 35
The following figure shows the iptables hierarchy 35
Observe and erase chain rules 36
Append or delete rules 37
Define policy for chain rules 37
Enabling nat at bootup 39
Ia260 261 262 em 2260 lx user s manual managing communications 39
In most real world situations you will want to use a simple shell script to enable nat when the ia260 ia261 ia262 em 2260 boots up the following script is an example 39
Nat area private ip 39
Nat example 39
The ip address of lan1 is changed to 192 68 27 you will need to load the module ipt_masquerade 39
Dial up service ppp 40
Example 1 connecting to a ppp server over a simple dial up connection 40
Example 2 connecting to a ppp server over a hard wired link 41
How to check the connection 42
Setting up a machine for incoming ppp connections 43
Nfs network file system 45
Setting up the ia260 ia261 ia262 em 2260 as an nfs client 45
Openvpn 46
Copy the file that is generated to the openvpn machine 47
Generate a script file named openvpn bridge on each openvpn machine this script reconfigures interface eth1 as ip less creates logical bridge s and tap interfaces loads modules enables ip forwarding etc 47
Host a 47
Host a b represents one of the machines that belongs to openvpn a b the two remote subnets are configured for a different range of ip addresses when this setup is moved to a public network the external interfaces of the openvpn machines should be configured for static ips or connect to another device such as a firewall or dsl box first 47
Host b 47
Ia260 261 262 em 2260 lx user s manual managing communications 47
Internet internet 47
Lan1 192 68 71 47
Lan1 192 68 72 lan1 192 68 74 47
Lan1 192 68 73 47
Lan2 192 68 73 47
Lan2 192 68 74 47
Local net 47
Openvpn a 47
Openvpn b 47
Set up four machines as shown in the following diagram 47
Setup 1 ethernet bridging for private networks on different subnets 47
Ia260 261 262 em 2260 lx user s manual managing communications 48
Create link symbols to enable this script at boot time 49
Ia260 261 262 em 2260 lx user s manual managing communications 49
Setup 2 ethernet bridging for private networks on the same subnet 51
Create a configuration file named a tun conf and an executable script file named a tun sh 52
Create a configuration file named b tun conf and an executable script file named b tun sh on openvpn b 52
Host a 52
Host b 52
Ia260 261 262 em 2260 lx user s manual managing communications 52
Internet internet 52
Lan1 192 68 71 52
Lan1 192 68 72 lan1 192 68 74 52
Lan1 192 68 73 52
Lan2 192 68 73 52
Lan2 192 68 74 52
Local net 52
Openvpn a 52
Openvpn b 52
Set up the four machines as shown in the following diagram 52
Setup 3 routed ip 52
Development tool chains 54
Compilation for applications 55
Linux tool chain 55
Steps for installing the linux tool chain 55
On line debugging with gdb 56
Programmer s guide 57
Device api 58
Flash memory map 58
Rtc real time clock 58
Buzzer 59
Baudrate inaccuracy 60
Example to get the baudrate 60
Example to set the baudrate 60
Special note 60
Introduction 61
Moxacan programming guide 61
Programming guide 61
Application programming interface 64
Digital i o 64
Examples 66
Special note 66
Ia260 ia261 ia262 em 2260 linux user s manual programmer s guide 67
Ia260 ia261 ia262 em 2260 linux user s manual programmer s guide 68
13 6 13 69
Bin rm f fname fname dbg o 69
Dio program make file example 69
Ia260 ia261 ia262 em 2260 linux user s manual programmer s guide 69
A system commands 70
Editor 70
File manager 70
Linux normal command utility collection 70
Network 70
System commands 70
Moxa special utilities 71
Process 71

Moxa IA261-I-T-LX [28/71] Managing communications

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