[syslinux] Syslinux 4.10-pre20

[H. Peter Anvin]

On 05/25/2012 03:50 AM, Geert Stappers wrote:
> On Thu, May 10, 2012 at 11:04:00PM -0700, Shantanu Gadgil wrote:
>>
>> Hi,
>> Any update on this? Does the traffic dump help?
>> Is it even correct? (I am not familiar with using tcpdump much)
> 
> Both tcpdumps could be further analyzed. So kno
> 
> The v406pre3.dump looks fine.
> 
> The v410pre20.dump his this interresting, perhaps strange pattern:
> 
> 13:29:39.210724 IP 10.209.170.241.49153 > 10.209.170.239.69:  79 RRQ "pxelinux.cfg/44454c4c-4200-1037-8038-c2c04f343253" octet tsize 0 blksize 1408 
> 13:29:39.210894 IP 10.209.170.239.40073 > 10.209.170.241.49153: UDP, length 79
> 13:29:39.212393 IP 10.209.170.241 > 10.209.170.239: ICMP 10.209.170.241 udp port 49153 unreachable, length 36
> 13:29:39.282219 IP 10.209.170.241.49153 > 10.209.170.239.69:  79 RRQ "pxelinux.cfg/44454c4c-4200-1037-8038-c2c04f343253" octet tsize 0 blksize 1408 
> 13:29:39.282329 IP 10.209.170.239.33209 > 10.209.170.241.49153: UDP, length 79
> 13:29:39.283941 IP 10.209.170.241 > 10.209.170.239: ICMP 10.209.170.241 udp port 49153 unreachable, length 36
> 13:29:39.392125 IP 10.209.170.241.49153 > 10.209.170.239.69:  79 RRQ "pxelinux.cfg/44454c4c-4200-1037-8038-c2c04f343253" octet tsize 0 blksize 1408 
> 13:29:39.392235 IP 10.209.170.239.44117 > 10.209.170.241.49153: UDP, length 79
> 13:29:39.393792 IP 10.209.170.241 > 10.209.170.239: ICMP 10.209.170.241 udp port 49153 unreachable, length 36
> 
> 
> .241:49153 asks .239:69 for file
> .239:40073 replies .241:49153 with file not found
> .241 informs .239 that it is "unreachable"
> 
> 
> To me it seems that the 4.10 pxelinux and the PXE stack on the Dell
> don't mix that well.
> 

This is a very interesting discovery.  It could be that the native PXE
BC gets control.  This might explain at least one set of problems that
we have.

The other possibility of course is that we're using the lwIP UDP
interface incorrectly (we have already had that problem once.)

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.