Moxa Technologies 331 User Manual download pdf (Page 45)

Moxa C Programmable RTU Controllers Managing Communications

4-11

# Edit the rc.local file to make this shell startup automatically.

# vi /etc/rc.d/rc.local

# Add a line in the end of rc.local /home/nat.sh

EXIF=‘eth0’ # This is an external interface for setting up a valid IP address.

EXNET=‘192.168.4.0/24’ #This is an internal network address.

# Step 1. Insert modules.

# Here 2> /dev/null means the standard error messages will be dump to null device.

modprobe ip_tables 2> /dev/null

modprobe ip_conntrack 2> /dev/null

modprobe ip_conntrack_ftp 2> /dev/null

modprobe ip_conntrack_irc 2> /dev/null

modprobe iptable_nat 2> /dev/null

modprobe ip_nat_ftp 2> /dev/null

modprobe ip_nat_irc 2> /dev/null

# Step 2. Define variables, enable routing and erase default rules.

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

export PATH

echo “1” > /proc/sys/net/ipv4/ip_forward

/bin/iptables -F

/bin/iptables -X

/bin/iptables -Z

/bin/iptables -F -t nat

/bin/iptables -X -t nat

/bin/iptables -Z -t nat

/bin/iptables -P INPUT ACCEPT

/bin/iptables -P OUTPUT ACCEPT

/bin/iptables -P FORWARD ACCEPT

/bin/iptables -t nat -P PREROUTING ACCEPT

/bin/iptables -t nat -P POSTROUTING ACCEPT

/bin/iptables -t nat -P OUTPUT ACCEPT

# Step 3. Enable IP masquerade.

Dial-up Service—PPP

PPP (Point to Point Protocol) is used to run IP (Internet Protocol) and other network protocols over serial

connection. PPP can be used for direct serial connections (using a null-modem cable) over a Telnet link, and for

links established using a modem over a telephone line.

Modem and PPP access is almost identical through the RTU controller’s Ethernet port. Since PPP is a

peer-to-peer system, the RTU controller can also use PPP to link two networks (or a local network to the

Internet) to create a Wide Area Network (WAN).

NOTE

Click on the following links

for more information about ppp:

http://tldp.org/HOWTO/PPP

-HOWTO/index.html

http://axion.physics.ubc.ca/ppp

-linux.html

The pppd daemon is used to connect to a PPP server from a Linux system. For detailed information about pppd

see the man page.

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Moxa Technologies 331 User Manual Page 45

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