[ipxe-devel] help pushing iscsi targets with DHCP

Robin Smidsrød robin at smidsrod.no
Thu Jul 25 19:41:48 UTC 2013

On 25.07.2013 17:11, Gruher, Joseph R wrote:
> After doing some more reading last night it looks like it might at least be possible by using host or subclass statements, each having a unique root-path and being tied to a unique MAC, except then I have to capture all the client MAC addresses on the server.  It would be nice if I could just tell the server when it hands out hand out the root path for target01, and hand out target02, and so on, so I can just pair targets to IPs.  All the clients are identical so it doesn't actually matter if they get the same target every time and long as they each get a unique target.

The root-path DHCP option uses the same sanboot URL syntax as
sanboot/sanhook, so you can indeed use DHCP host blocks to target it
directly to the specific nodes. Using the assigned IP address as the
wildcard for specifying the target IQN is a viable solution, albeit a
but uncommon. But for your use-case it seems to be a good option.

I'm not sure _how_ to do what you're suggesting in ISC dhcpd, though.

>From what I understand, you can have a generic subnet block, but you'll
need to be able to pull out the DHCP response variable representing the
currently assigned IP address for the host (before it's actually sent to
the client) and use that to dynamically build up the root-path for the
same client.

I'd very much like to see the dhcpd config block that actually does
that, as I have no idea how to do that myself.

-- Robin

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