different DHCP-ack option through DHCP-request and DHCP-inform from same host

Shane Kerr Shane_Kerr at isc.org
Tue Jul 18 12:49:16 UTC 2006


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Mohr, Andreas wrote:
> hi,
> we using isc dhcp 3.0.4 under solaris9
> and observe different DHCP-ack option through DHCP-request and
> DHCP-inform packets
> from same host.
>  
> our config:

<snip/>

> Why dont use dhcp-ack for dhcp-inform not the group host
> domain-name-servers option?

I think the answer lies in this value in the DHCPINFORM packet:

    Relay agent IP address: 10.165.1.1 (10.165.1.1)

If this value (giaddr) is set, then DHCPINFORM uses it to decide which
subnet to use. The DHCPREQUEST relies only on the client address to
select the subnet.

I think this is a bug, but it was coded specifically to behave in this
way, so maybe there is something I'm missing. I'll check this out and
we'll fix it if it is a bug.

- --
Shane
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