> Sometimes, the DHCPOFFER message needs to be sent broadcast back to
> the client.  In other words, the dest IP address is 0xffffffff, and
> the dest MAC address is the client's.  I don't think you can do this
> with UDP.

I'd challenge you to quote the text in RFC 2131 which requires this.
This is such a huge layering and semantic violation that I don't think
anyone would even dare to write it down, let alone have it remain in
the document all the way to draft standard status, even if it could
otherwise be widely implemented.

I think DHCPOFFER messages are always sent addressed to 'yiaddr' address,
and this is never 255.255.255.255.

Dennis Ferguson