[syslinux] Intel Boot Agent 1.2.16 specific problem

[H. Peter Anvin]

Matthias Halfmann wrote:
> Hello,
> 
> I have a currently working pxe/tftp network boot configuration. I'm 
> using tftpd-hpa.
> 
> Recently I tried to add a new PC, which has an onboard Intel 82540 GigE 
> ethernet controller. When the PC boots, it successfully speaks with DNS 
> and attempts to download pxelinux.0 from the tftp server. This ends in a 
> TFTPD read time out. I tcpdumped the traffic and found:
> 
> 
> 192.168.13.167.2070 > 192.168.12.22.69:  27 RRQ "pxelinux.0"
> 192.168.12.22.34484 > 192.168.13.167.2070:  udp 14
> 192.168.13.167.3651 > 192.168.12.22.34484:  udp 17
> 192.168.12.22 > 192.168.13.167: icmp: 192.168.12.22 udp port 34484 
> unreachable [tos 0xc0]
> 
> 192.168.13.167.2071 > 192.168.12.22.69:  32 RRQ "pxelinux.0"
> 192.168.12.22.34485 > 192.168.13.167.2071:  udp 516
> 192.168.13.167.3651 > 192.168.12.22.34485:  udp 4
> 192.168.12.22 > 192.168.13.167: icmp: 192.168.12.22 udp port 34485 
> unreachable [tos 0xc0]
> 
> It seems like the tfp machine is unhappy about the PC changing source 
> ports. Has anyone seen this before? Or have suggestions for a work around?
> 

That's a serious bug, and a total violation of the TFTP protocol.

	-hpa