DA-660-8/16-LX User’s Manual
Managing Communications
4-2
Telnet / FTP
In addition to supporting Telnet client/server and FTP client/server, the DA-660 also supports SSH
and SFTP client/server. To enable or disable the Telnet/FTP server, you first 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
. The default is to
enable the Telnet/ftp server:
discard dgram udp wait root /bin/discard
discard stream tcp nowait root /bin/discard
telnet stream tcp nowait root /bin/telnetd
ftp stream tcp nowait root /bin/ftpd -l
Disabling the Telnet/FTP server
Disable the daemon by placing a ‘#’ in front of the first character of the row to comment out the
line.
#telnet stream tcp nowait root /bin/telnetd
#ftp stream tcp nowait root /bin/ftpd -l
DNS
The DA-660 supports the DNS client (but not the DNS server). To set up the DNS client, you need
to edit three configuration files:
/etc/hosts, /etc/resolv.conf,
and
/etc/nsswitch.conf
.
/etc/hosts
This is the first file that the Linux system reads to resolve the host name and IP address.
/etc/resolv. conf
This is the most important file that you need to edit when using DNS for the other programs. For
example, before using
#ntpdate time.nist.goc
to update the system time, you will need to add the
DNS server address to the file. Ask your network administrator for the DNS server address to use.
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 168.95.1.10
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 of files to be read to resolve the IP address -
/etc/hosts
or
/etc/resolv.conf
.