Brief Introduction to PPP kernel Compilation

The PPP protocol is widely used. Common settings include ADSL and other dial-up settings. Here we will focus on the kernel compilation of the PPP protocol. Let's take a look at how to set up PPP in the kernel.

Compile the kernel to support ppp

 
 

  
  
make menuconfig   
  
  
network device support   
  
  
ppp support   
  
  
ppp multilink support   
  
  
ppp support for async serial ports   
  
  
ppp support for sync tty ports   
  
  
ppp deflate compression   
  
  
ppp BSD_compress compression   
  
  
ppp over Ethernet   
  
  
SLIP(serial line )support   
  
  
CSLIP compressed headers 
 
 

3: Compile the dial-up tool pppd chat. Select:

 
 

  
  
network application   
  
  
pppd   
  
  
rp-pppoe   
  
  
miscellanenous application   
  
  
chat 
 
 

4. Create a device Node

 
 

  
  
ppp,c,108,0  
 
 

5: Create the resolv. conf file and configure dns (you can set this parameter. Use usepeerdns in the/etc/ppp/options option)

 
 

  
  
/etc/ppp/resolv.conf   
  
  
nameserver 211.136.20.203   
  
  
nameserver 211.136.17.107  
 
 

6: Create a dialing script (the script is successfully transplanted to the Development Board under redhat9)

 
 

  
  
/bin : ppp-on   
  
  
ppp-off   
  
  
/etc/ppp:   
  
  
pap-secrets   
  
  
chap-secrets   
  
  
options  
 
 

If you want to view debugging information on the Development Board, compile syslogd into the kernel. After entering uclinux, you can view debugging information in/var/log/messages.

In addition, the following are some error-prone LOG information I have summarized.

"Lcp: timeout sending config-requests"

In this case, the server is not connected, so there are many kinds of errors, such as incorrect dialing number, serial port, and baud rate.

"Authentication-related"

In rh9, the default value is "auth". Therefore, the authentication username and password cannot be blank.

It seems that cdma adopts the chap authentication method, while gprs adopts the pap authentication method)

"Lcp terminated by peer"

Generally, this is caused by an authentication failure. Check options, pap-secrets, chap-secrets, and other files.

"Connect scripts failed"

This error is generally caused by the connect option. Check whether your script path, serial port, and baud rate are correct.

Another error occurs in chat sessions, such

 
 

  
  
sending( )   
  
  
expected ()  
  
  
alarm 
 
 

Check the chat session in this case.

Last case: "Serial line is looped back."

If you encounter this situation, it proves that you are lucky --! To solve this problem, check the serial port driver and serial port connection. In addition, add "~ ", Maybe it's your solution.

-Mn no magic

Or change the baud rate. Some moden have special limitations on the baud rate.

In short, you must understand the implementation principles of ppp before dialing. Therefore, the ppp-howto FAQ must be read. I think, if you really understand howto and FAQ, dialing is a simple task.