[Soekris] PXEboot on 4801

[Stuart Henderson]

On 2007/05/19 13:07, Bill Maas wrote:
> The M- without much doubt stands for Meta (emacspeak for "Esc" I
> believe). If that is correct, the entire string would read
> "meta-caret",

actually M-^? (meta-del) not M-^ (aka 0xFF). This is actually dhcp
end-of-options and is correctly being sent by the DHCP server.

> I'm not sure why PXE would sent that sequence, if it does at all.

Many PXE clients are buggy and don't stop reading the filename
after counting 'length' number of characters.

| |  RFC 2132        DHCP Options and BOOTP Vendor Extensions      March 1997
|o| 
| | 
|o|  9.5 Bootfile name
| | 
|o|     This option is used to identify a bootfile when the 'file' field in
| |     the DHCP header has been used for DHCP options.
|o| 
| |     The code for this option is 67, and its minimum length is 1.
|o| 
| |         Code  Len   Bootfile name
|o|        +-----+-----+-----+-----+-----+---
| |        | 67  |  n  |  c1 |  c2 |  c3 | ...
|o|        +-----+-----+-----+-----+-----+---

Rearranging the order can sometimes help, if this is a dhcpd which
supports sending 'option pad' (0x00) after the filename, that should
help too. It may alternatively be possible to specify the filename
byte-by-byte, in which case adding a trailing 0x00 should help here
(there is some chance of this breaking working implementations, but
in practice it's unlikely).