buglwIP - A Lightweight TCP/IP stack - Bugs: bug #15467, UDP check sum calc

 
 

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bug #15467: UDP check sum calc

Submitted by:  thorsetn <tetet>
Submitted on:  Tue 17 Jan 2006 02:06:03 PM UTC  
 
Category: UDPSeverity: 3 - Normal
Item Group: NoneStatus: Invalid
Privacy: PublicAssigned to: None
Open/Closed: ClosedPlanned Release: None
lwIP version: None

Tue 21 Mar 2006 12:46:07 PM UTC, comment #2:

Tested lwip STABLE-1_1_1 with a 12 byte payload UDP datagram. The sent UDP checksum is ok. Maybe the problem is in PPP.

Christiaan Simons <christiaans>
Project Member
Wed 01 Feb 2006 08:19:47 AM UTC, comment #1:

Is the "message length" you refer to the UDP payload length or any other length? Can you give some more details? Did you try the -D LWIP_DEBUG compiler flag and the lwipopts.h debugging options?

Christiaan Simons <christiaans>
Project Member
Tue 17 Jan 2006 02:06:03 PM UTC, original submission:

hello,

the UDP protocol check sum is wrong if the message is only 12 Bytes long. IP check sum is okay but UDP check sum is wrong. If the message is bigger (100 bytes) the udp/ip check sum is correct.

i use the lwip with a ppp connection over a serial interface (for reconstruction).

i hope that will help you to fix this problem

thorsetn <tetet>

 

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Date Changed By Updated Field Previous Value => Replaced By
Tue 21 Mar 2006 12:46:07 PM UTCchristiaansStatusNone=>Invalid
  Open/ClosedOpen=>Closed

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