[lwip-users] lwIP, PPP, DNS

[yueyue papa]

Hi All,

 

I have some questions lwIPs. My embeded system do not has LAN inteface, and I only use PPP on GPRS to get network environement.

 

I found dns_init will be called before netif ready? (there is UDP bind in dns init)

 

1> if network is not ready, will this bind cause crash?

 

PPP will get the two DNS server in negotiate,

2> how could I set the two new DNS server to the system?

     I tried dns_setserver(...), in PPP callback.

 

My lwIP and PPP porting code are working in the windows environment, but current code meet crash in our embeded device.

 

Our device is bigendian, and I already redefine the BYTEORDER in cc.h

 

3> Is there any other suggestion for my crash possibity. ?

    Our system is unable to make debug, so I could only read the log.

 

My test is

1   If I enable dns_init, in lwip_init, the crash is caused in dns_init.

     so I think the crash may caused by udp binded in the unavaiable network interface.

2.  if i remove teh dns_init in the lwip_init, the ppp negotiate happend.

     The two DNS IP address is goted, but crashed in sigup.  May be in network inteface APIs. (remove)

 

The crash stops me these days.

 

lee