When reading the RFC it appears the broadcast bit specifies to the
server how the client wants the server to respond.  I have a few
requests:

1. Can you create pcaps in Ubuntu / RHEL with various settings (like
always broadcast on and off) so we can compare the behaviour and packet
changes

2. Is DHCP (program/code) on other treating IB differently (i.e. find
the code/patch and does it do a 'if IB broadcast, else unicast reuest"

3. Can you point to other bug fixes you might have found for this?

I found via google someone doing the following:

interface "ethX" {
   supersede dhcp-server-identifier 255.255.255.255;
}

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https://bugs.launchpad.net/bugs/1529815

Title:
  InfiniBand DHCP flow with PRA and DHCP relay not working

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