[syslinux] FWIW - small bug in a PXE client

[Jim Cromie]

hi HPA,

in case youre collecting such bugs, heres what (I think) I know.
sorry for the excessive/pedantic detail..


this PXE code

NSC DP83815/DP83816 Fast Ethernet UNDI, 
v1.03                                 
Copyright (C) 2002, 2003 National Semiconductor Corporation
All rights reserved.

Pre-boot eXecution Environment  PXE-2.0 (build 082)
Copyright (C) 1997-2000  Intel Corporation


has a tftp client that requests option tsize on file transfer,
but then complains about getting it.
I cant cut-paste from wireshark window, so I'll summarize:

client sends Read Request (1) for pxelinux.0 with option tsize=0,
tftpd sends Option Acknowledgement (6), tsize = 13940 (the size of v3.51)


client responds with Error Code (5) not defined

It then re-requests Read, this time with option blksize = 1456

tftpd-hpa acknowledges (6) this

client then send Acknowledgment (4) for block 0
tftpd sends Data Packet (3), block 1, data (1456 bytes)
client acknoldeges (4) block 1,
cycle repeats to completion.