[Kea-users] Help! Kea 1.1 sends unicast, breaks iPXE

[Ledochowski, Roy]

Hi Klaus

First, thank you for the reply.

I should have mentioned that my test VM is loading undionly.kpxe.  The iPXE developer’s list confirmed that the root problem is that Kea is using the client’s unicast MAC address in the DHCP offer instead of the broadcast address; iPXE rejects it.

Which exact file are you using for iPXE?  I can test it as well.

Thanks again
roy


From: Klaus Steden [mailto:klausfiend at gmail.com]
Sent: Thursday, January 05, 2017 11:33 AM
To: Ledochowski, Roy <roy.ledochowski at hpe.com>; kea-users at lists.isc.org
Subject: Re: [Kea-users] Help! Kea 1.1 sends unicast, breaks iPXE


We're using Kea and iPXE to do cross-site provisioning so I'm not sure what's not working for you. One thing I did run into early in testing was having to use the kpxe shim (I think that's the suffix, it's one of the binary variants generated by the makefile and not the default one) because the DHCP request packet from iPXE and preseed were subtly different enough that Kea would create two leases ... but once we got that, it's been solid to the tune of several hundred devices ...

I can share parts of my config if you're interested; I did end up using a beta version in our application because it had additional option parsing logic operators, but those have been merged into the released version in the meantime.

cheers,
Klaus
Sent from my tri-corder



On Thu, Jan 5, 2017 at 9:19 AM -0800, "Ledochowski, Roy" <roy.ledochowski at hpe.com<mailto:roy.ledochowski at hpe.com>> wrote:

HI all-



I am looking into replacing ISC DHCPd with Kea in our dev lab.  One of the primary requirements is iPXE chainloading - in other words, the PXE ROM on the NIC must be able to download and execute iPXE over the network.



From packet dumps, it appears that Kea is using the unicast MAC address in the destination in DHCP offers.  This works for the NIC's PXE ROM, and loads iPXE but iPXE rejects the offers because it expects the broadcast MAC address.   As a result iPXE never gets an IP address and fails to execute.



I've setup a simple test environment in VMware Workstation 12.5:



| ---------------- |

| Kea 1.1 VM     | ens37

|  CentOS 7        |----------------------| Test VM

| ---------------- |

         | ens33

         |

         |

    outside



The interface configuration is

"interfaces-config": {

    "interfaces": [ "ens37" ]

}



I have the packet captures if anyone is interested.



Any help is much appreciated and thanks ahead of time,

roy

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