[syslinux] [pxelinux] pxelinux and TFTP block_size

[H. Peter Anvin]

Grégory MAMAN wrote:
> Hello, 
> 
> I wanted to know if it is possible to specify tftp
> block size > 2k in pxelinux.asm ? 
> 
> In the source of pxelinux.asm, it is said : "The code
> assumes TFTP_LARGEBLK <= 2K.". 
> 
> What is the limitation ? Would it be possible to
> increase this value ? 
> 
> Thanks in advance 
> 

You don't want to do that.

Way too many PXE stacks will fail if they get fragmented packets.

The 2K limitation comes from the number of permitted connections, which
is currently set to 32, times the size of a buffer needing to fit within
a single 64K segment.

	-hpa