[lwip-devel] [bug #41787] DHCP Discovery is invalid when an IP is set to thet netif.

[Nick van IJzendoorn]

URL:
  <http://savannah.nongnu.org/bugs/?41787>

                 Summary: DHCP Discovery is invalid when an IP is set to thet
netif.
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dipswitch_
            Submitted on: Thu 06 Mar 2014 08:40:21 AM GMT
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.4.0

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Details:

The DHCP client will send an invalid DHCP Discovery packet (according to
RFC2131 the ciaddr MUST be zero in the DISCOVERY phase) when the IP of the
netif is already set. For instance when you are switching from static IP to
dynamic IP.

I know you could clear the IP, subnet and gateway yourself before starting the
DHCP client. But I personally think it would be cleaner / better if LwIP
clears the IP, subnet and gateway before turning on the DHCP client.

One solution could be to patch the DHCP client like the patch provided.




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