Moxa V2401-CE [47/108] Connecting to a ppp server over a hard wired link

V2401/2402 Series Linux User’s Manual Managing Communications

3-20

115200 The baud rate.

debug Log status in syslog.

crtscts Use hardware flow control between computer and modem

(at 115200 this is a must).

modem Indicates that this is a modem device; pppd will hang up the phone before

and after making the call.

defaultroute Once the PPP link is established, make it the default route; if you have a PPP

link to the Internet, this is probably what you want.

192.1.1.17 This is a degenerate case of a general option of the form x.x.x.x:y.y.y.y. Here

x.x.x.x is the local IP address and y.y.y.y is the IP address of the remote end

of the PPP connection. If this option is not specified, or if just one side is

specified, then x.x.x.x defaults to the IP address associated with the local

machine’s hostname (located in /etc/hosts), and y.y.y.y is determined by the

remote machine.

Connecting to a PPP Server over a Hard-wired Link

If a username and password are not required, use the following command (note that noipdefault is

optional):

#pppd connect ‘chat –v“ “ “ “ ’ noipdefault /dev/tty 19200 crtscts

If a username and password is required, use the following command (note that noipdefault is

optional, and root is both the username and password):

#pppd connect ‘chat –v“ “ “ “ ’ user root password root noipdefault /dev/ttyS0 19200 crtscts

Checking the Connection

Once you have set up a PPP connection, there are some steps you can take to test the connection.

First, type:

#/sbin/ifconfig

Depending on your distribution, the command might be located elsewhere. After executing the

command, you should be able to see all of the network interfaces that are UP.

ppp0 should be one of them, and you should recognize the first IP address as your own and the

P-t-P address (point-to-point address, the address of your server). The output is similar to the

following:

lo Link encap Local Loopback

inet addr 127.0.0.1 Bcast 127.255.255.255 Mask

255.0.0.0

UP LOOPBACK RUNNING MTU 2000 Metric 1

RX packets 0 errors 0 dropped 0 overrun 0

ppp0 Link encap Point-to-Point Protocol

inet addr 192.76.32.3 P-t-P 129.67.1.165 Mask

255.255.255.0

UP POINTOPOINT RUNNING MTU 1500 Metric 1

RX packets 33 errors 0 dropped 0 overrun 0

TX packets 42 errors 0 dropped 0 overrun 0