> hi, all
> these days, I tried to test ppp link between two redhat
> linux9.0(using null modem connection), acoording Chapter 29. Using PPP
> across a null modem (direct serial) connection in PPP-HWOTO,,
What kind of nullmodem, a 3-wire or full nullmodem?
I guess you know that a nullmodem is not a "direct serial" connection
in the pin-to-same-pin sense.
> but when I type
> [root@localhost ~]# pppd /dev/ttyS0 nodetach
> I got the following messages:
> using channel 3
> Using interface ppp0
> Connect: ppp0 <--> /dev/ttyS0
> sent [LCP ConfReq id=0x1
[repeated 9 more times]
> LCP: timeout sending Config-Requests
No response means that the "server" pppd is unable to respond or that
LCP messages are being lost or corrupted.
> I have done the following things:
> 1. the client(using minicom) can login into the server(using
> 2.the configurations about server ppp as follows:
If you use local then you should use xonxoff, not crtscts. If you use
crtscts then you should not use xonxoff or local. The options local and
xonxoff are for a 3-wire nullmodem and crtscts is for a full nullmodem.
> asyncmap 0
Just a heads-up: If it turns out that you need to use xonxoff then you
should not specify asyncmap.
> netmask 255.255.255.0
> ms-dns 192.168.1.1
Not related to the current problem but you might also need
> ppp * 123pcz *
> 3. the configuration about client ppp as follow
The server comments regarding local, xonxoff, and crtscts also apply to
> user ppp
> ppp * 123pcz *
> any replys are welcom, thks!
Finally, be sure ttyS0 is the correct serial port for the nullmodem cable
and is correctly configured.
/* Editing with vi is a lot better than using a huge swiss army knife.
Use =} to wrap paragraphs in vi. Or put map ^] !}fmt -72^M in
~/.exrc and use ^] to wrap to 72 columns or whatever you choose. */