[lwip-devel] [bug #19927] DHCP NACK problem

[Cui hengbin]

URL:
  <http://savannah.nongnu.org/bugs/?19927>

                 Summary: DHCP NACK problem
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: phant
            Submitted on: Tuesday 05/22/2007 at 07:08
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Hi All:
      I use dhcp in my project with a CableModem.when starting the TCP/IP ,CM
give me a ip address through DHCP,But when CM is on line ,CM send NACK to
me,so I must discover again .But In dhcp_hanfrl_nak() simple set state with
DHCP_BACKING_OFF,let dhcp_timeout to discover,when sniffering the network,I
find discover UDP broadcast with the old IP adress .is not "0.0.0.0",so dhcp
server may not reply.
  so I change the dhcp_timeout follow:

static void dhcp_timeout(struct netif *netif)
{
  struct dhcp *dhcp = netif->dhcp;
  LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_timeout()\n"));
  /* back-off period has passed, or server selection timed out */
  if (dhcp->state == DHCP_BACKING_OFF) {
 dhcp_release(netif); 
dhcp_discover(netif);
}else if(dhcp->state == DHCP_SELECTING) {
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting
discovery\n"));
    dhcp_discover(netif);
  /* receiving the requested lease timed out */
  } else if (dhcp->state == DHCP_REQUESTING) {
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
    if (dhcp->tries <= 5) {
      dhcp_select(netif);
    } else {
      LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
      dhcp_release(netif);
      dhcp_discover(netif);
    }
  /* received no ARP reply for the offered address (which is good) */
  }.........
.........
}

Can You agree?





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