Moxa W406-CE [46/74] Dial up service ppp
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Moxa W406-CE [46/74] Dial up service ppp

Moxa W406-T-CE [46/74] Dial up service ppp
W315A/325A Linux User's Manual Managing Communications
4-12
# 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 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 the W315A/325A’s Ethernet
port. Since PPP is a peer-to-peer system, the W315A/325A 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.
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 ppp servers
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
The pppd options are described below:
connect ‘chat etc...’
This option gives the command to contact the PPP server. The ‘chat’ program is used to dial a remote computer.
The entire command is enclosed in single quotes because pppd expects a one-word argument for the ‘connect’
option. The options for ‘chat’ are given below:
-v
verbose mode; log what we do to syslog

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