[En-Nut-Discussion] Problem with DHCP

[Hugo Simon]

>   Since my network has no DHCP server, I´m running the DHCP server
>from Tftpd by Ph. Jounin. I can see in the log window that the board
>does requests an address ( Rcvd DHCP Rqst Msg for IP 0.0.0.0, MAC
>00:50:C2:4B:50:03 (07/12 16:16:44.093) ), but the device doesn´t get
>any address from the pool, instead, it uses the last configured
>address.

I don't exactly see why your routine isn't working correctly, but I think
you think too complicated. I did it this way:

  /* first try it completely from EEPROM/DHCP */
  if (NutDhcpIfConfig("eth0", 0, 20000))
  {
    /* oops, maybe we didn't have a configured MAC, so try a default one */
    if (NutDhcpIfConfig("eth0", mac, 20000))
    {
      /* again oops, looks like there is something wrong with the
configuration
         so use default settings */
      DEBUG_PRINTF_P(PSTR(" DHCP failed, using default settings\n"));
      NutNetIfConfig2("eth0", mac, ip_addr, ip_mask, ip_gate);
    }
  }

NutDhcpIfConfig already loads the settings from EEPROM if there is any. If
there is a configured IP in confnet.cdn_cip_addr other than 0.0.0.0 it uses
this one, otherwise it tries DHCP. If that fails too, it returns an error.
In that case a default config is used.

If you like I have some web based configuration routines where the user can
configure the network settings via browser. If you are interested contact me
personally.

Hope it helps.
Bye
Thorsten