[ipxe-devel] DHCPDISCOVER announcement of capabilities?

[Jarrod Johnson]

One problem I have as many iPXE implementations start appearing in vendor
firmware is that I can't tell at DHCP transaction time whether the requester
has CONFIG_*BLAH* set.  For example, I usually have a conditional to say
something like 'if not iPXE, chainload iPXE, else http boot', and then a
vendor nic has iPXE, but not HTTP enabled.  My workaround is basically to
have my own build and burn it on adapters as needed with a different vendor
id to match on.  Any ideas on how iPXE might be able to announce what
features it has (kinda like how the banner advertises on-screen, but in
DISCOVER in a way that can be examined by dhcpd).  I'm thinking a bitfield
with each CONFIG option mapped to a bit position.

At that point, I'd just need to see if I can 'and' values against a mask
before compare in dhcpd conditionals.
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