dhcp server (unicast replay)

[EvilEzh]

btw .. it works anyway with dhcp relay set. So nothing to do with it.
With relay everything looks ok. :) It works. option 82 is also ok.

> Actualy i see in packet source x.x.x.x (client) -> z.z.z.z (server).
> replay is z.z.z.z -> y.y.y.y (relay).
> There is several retries from client. So i think clien't don't receive 
> packet from relay.
> So if there is unicast from already configured client .. response should 
> be sent directly back to client ignoring relay.
>
> DHCPREQUEST generated during RENEWING state:
>      ........... This message will
>      be unicast, so no relay agents will be involved in its
>      transmission.  Because 'giaddr' is therefore not filled in, the
>      DHCP server will trust the value in 'ciaddr', and use it when
>      replying to the client.
>
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