Moxa DA-681A-I-DPP-T-LX [19/79] Dynamic ip address using dhcp

DA-681A Series Linux Managing Communications

3-3

Dynamic IP Address using DHCP

To configure one or both LAN ports to request an IP address dynamically, replace static with dhcp and then

delete the rest of the lines.

# The primary network interface

allow-hotplug eth0

iface eth0 inet dhcp

After modifying the boot settings of the LAN interface, issue the following command to activate the LAN settings

immediately.

# /etc/init.d/networking restart

MOXA:~# /etc/init.d/networking restart

Adjusting IP Addresses with “ifconfig”

IP settings can be adjusted during run-time, but the new settings will not be saved to the flash ROM without

modifying the file /etc/network/interfaces. For example, type the command # ifconfig eth1

192.168.1.1 to change the IP address of LAN1 to 192.168.1.1.

MOXA:~# ifconfig eth1 192.168.1.1

MOXA:~#

DNS Client

The DA-681A-LX supports DNS client (but not DNS server). To set up DNS client, you need to edit three

configuration files: /etc/hostname, /etc/resolv.conf, and /etc/nsswitch.conf.

/etc/hostname

1. Edit /etc/hostname:

MOXA:~# vi /etc/hostname

MOXA

2. Re-configure the hostname.

MOXA:~# /etc/init.d/hostname.sh start

3. Check the new hostname.

MOXA:~# hostname

/etc/resolv.conf

This is the most important file that you need to edit when using DNS. For example, before you 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 which DNS server address you should use. The DNS server’s IP address is specified with

the nameserver command. For example, add the following line to /etc/resolv.conf (assuming the DNS

server’s IP address is 168.95.1.1):

nameserver 168.95.1.1

MOXA:/etc# cat resolv.conf