[En-Nut-Discussion] Sending Host name to DHCP server

[Harald Kipp]

"Host software MUST handle host names of up to 63
characters and SHOULD handle host names of up to
255 characters."
Quoted from
http://www.faqs.org/rfcs/rfc1123.html

As far as I understood this, host name is meant
as the FQDN here (fully qualified domain name).

I forgot, where this had been specified: Each
part of a FQDN should not exceed 63 characters.

In total, I intended to reserve 512 bytes of
EEPROM space for system configuration. Using
63 bytes would occupy more than 10%.

The RFC states, that the software MUST handle
a max. length of 63, but that's related to
remote hosts. We can safely limit our local
hostname to 16 characters or less. I'd vote
for 15 + 1 string delimiter. It doesn't
make sense to me, saving 1 byte in EEPROM and
wasting many bytes of Flash to handle a string
without delimiter.

Harald


At 16:55 03.03.2004 +0800, you wrote:
>Hi,
>Yea relised later that confnet is per interface.  I didn't know there
>was a confos structure.  A host name makes sense in there.  Default it
>to "ethernut" or something.  Don't know about Max characters.
>Theoretically probably could be 255, but that would waste heaps of
>eeprom, so 16 characters is quite usable, 8 is bearable.
>