[Kea-users] Kea not sending NAK

[Thomas Andersen]

Hi Ola,

You are correct that the broadcast flag is set in the REQUEST message from the client side.
However, I believe that the RFC still states that the relay should respond with unicast.
If there is a way to configure HP to do this, I’d love to do it. But I have not been able to find such configuration parameters. :(

Br,
Thomas




On 01/03/16 10:50, "kea-users-bounces at lists.isc.org on behalf of Ola Thoresen" <kea-users-bounces at lists.isc.org on behalf of ola at nytt.no> wrote:

>Just to confuse you even more, we have seen the same behaviour on 
>another relay-platform.
>(Unfortunately, I don't have any links to publicly available information 
>about the issue).
>
>Anyway, after debugging we discovered that the packets were sent FROM 
>the client with the "broadcast" flag set.
>The relay did not clear this flag, so when the reply was received by the 
>relay, it was sent (correctly) as a broadcast back to the client.
>The behaviour of DHCP-clients varies a lot when it comes to how it sets 
>the broadcast flag:
>https://blogs.technet.microsoft.com/teamdhcp/2009/02/12/dhcp-broadcast-flag-handling-in-windows-7/
>
>So the solution for us was to force the relay to clear the broadcast 
>flag on dhcp messages (I do not know if this is possible on your HP switch).
>That way, the replies were unicast back to the client, and everything 
>started working.
>
>
>Rgds.
>
>Ola Thoresen
>
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