[lwip-users] what the NETIF_FLAG_DHCP is for?

[Kiran Bacchewar]

HI all,

 

i want to enable the DHCP in lwip. iam using lwip 1.3 version.

 

i made the fallowing initialization...

 

#define LWIP_DHCP    1                (in lwipopts.h)

ip_addr.addr=0;                                (in init.c file)
netmask.addr=0; 
gw.addr=0;
netif_add(netif,ip_addr,netmask,gw,state,drvr_init,ethernet_input);
netif_set_default(netif);

netif_set_up(netif1);

dhcp_start(netif);

 

by this initialization, i can see the DISCOVER,OFFER,REQUEST,ACK packets sent to/from by the lwip as per the DHCP standard.... but when i ping for the offerd address, the board(on which lwip is ported)  doesn't respond... 

 

after doing some debug... i found that there is no ip address assigned in the netif->ip_addr, its assignde to 'zero' the initial value...

 

and if i disable the DHCP and give

1>the static ip addresses

2>make LWIP_DHCP  0  

3>remove the dhcp_start()

 

the ping, all the other appliacations works fine....

what might be the problem??? is the DHCP initialization right??? am i missing some thing???

what is the significance of NETIF_FLAG_DHCP?? where it should be set into the netif flags in the initialization sequence???

 

thank you in advance...