Moxa Technologies UC-7420/7410 user manual Dial-up Service-PPP

UC-7420/7410 User’s Manual Managing Communication

#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_nat_ftp 2> /dev/null modprobe ip_nat_irc 2> /dev/null modprobe ip_conntrack 2> /dev/null modprobe ip_conntrack_ftp 2> /dev/null modprobe ip_conntrack_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 /sbin/iptables -F

/sbin/iptables -X /sbin/iptables -Z /sbin/iptables -F -t nat /sbin/iptables -X -t nat /sbin/iptables -Z -t nat /sbin/iptables -P INPUT ACCEPT /sbin/iptables -P OUTPUT ACCEPT /sbin/iptables -P FORWARD ACCEPT /sbin/iptables -t nat -P PREROUTING ACCEPT /sbin/iptables -t nat -P POSTROUTING ACCEPT

/sbin/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 a serial link. PPP can be used for direct serial connections (using a null-modem cable) over a Telnet link, and links established using a modem over a telephone line.

Modem / PPP access is almost identical to connecting directly to a network through UC-7420/7410’s Ethernet port. Since PPP is a peer-to-peer system, UC-7420/7410 can also use

PPPto 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.

Example 1: Connecting to a PPP server over a simple dial-up connection

The following command is used to connect to a PPP server by modem. Use this command for old

pppservers that prompt for a login name (replace username with the correct name) and password (replace password with the correct password). Note that debug and defaultroute 192.1.1.17 are optional.

#pppd connect ‘chat -v “ “ ATDT5551212 CONNECT“ “ ogin: username word: password’ /dev/ttyM0 115200 debug crtscts modem defaultroute

If the PPP server does not prompt for the username and password, the command should be entered as follows. Replace username with the correct username and replace password with the correct password.

#pppd connect ‘chat -v “ “ ATDT5551212 CONNECT” ” ’ user username password password /dev/ttyM0 115200 crtscts modem

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