Moxa Technologies 331 User Manual download pdf (Page 36)

Moxa C Programmable RTU Controllers Managing Communications

4-2

Telnet/FTP

The Telnet and FTP Server service is enabled by default on the RTU controller. To enable or disable the

Telnet/ftp server, users need to edit the file /etc/inetd.conf.

Enabling the Telnet/FTP Server

The following example shows the default content of the file /etc/inetd.conf.

telnet stream tcp nowait root /bin/telnetd

ftp stream tcp nowait root /bin/ftpd -l

Disabling the Telnet/FTP Server

Disable the daemon by typing ‘#’ in front of the first character of the row to comment out the line.

DNS

To set up DNS client for the RTU controller, users need to edit three configuration files: /etc/hosts,

/etc/resolv.conf, and /etc/nsswitch.conf.

/etc/hosts

The hosts is the first file that the RTU controller system reads to resolve the host name of the remote IP

address.

/etc/resolv.conf

The resolv.conf contains the remote DNS server’s address in it. Ask the network administrator or service

provider which DNS server address should be configured to this file. The DNS server’s IP address is specified

with the “nameserver” command. For example, add the following line to /etc/resolv.conf if the DNS server’s IP

address is 168.95.1.1:

nameserver 168.95.1.1

10.120.53.100 - PuTTY

root@Moxa:/etc# cat resolv.conf

# resolv.conf This file is the resolver configuration file

# See resolver(5).

#nameserver 192.168.1.16

nameserver 168.95.1.1

nameserver 140.115.1.31

nameserver 140.115.236.10

root@Moxa:/etc#

/etc/nsswitch.conf

This file defines the sequence to resolve the IP address by using /etc/hosts file or /etc/resolv.conf.

Web Service—Apache

The Apache web server’s main configuration file is /etc/apache/conf/httpd.conf, with the default

homepage located at /home/httpd/htdocs/index.html. Save the customized homepage to the following

directory:

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Moxa Technologies 331 User Manual Page 36