client refuses to accept offer
richard at softwaredev.nl
Sat May 15 10:55:58 UTC 2010
From: dhcp-users-bounces+richard=softwaredev.nl at lists.isc.org
[mailto:dhcp-users-bounces+richard=softwaredev.nl at lists.isc.org] On Behalf
Sent: donderdag 13 mei 2010 2:26
To: Users of ISC DHCP
Subject: Re: client refuses to accept offer
To Chuck Anderson :
> Usually the routers and subnet-mask options go in the subnet block
> rather than the host blocks because they are more related to the
> properties of the entire subnet and would be the same for all hosts in
> that subnet. They should work in the host blocks in any case--it is
> just a bit unusual to configure them there.
> I notice that your router is not in the same subnet as the client.
> That is probably a misconfiguration. The router should probably be
> 220.127.116.11 or similar. Maybe this is why your clients are rejecting
> the offers.
The router setting does look unusual, but this is what the local net.
admin has told me for configuring static IP addresses.
To Simon Hobson :
> I'm confused ! You say there is no traffic to/from the DHCP server,
> but then say it's from 0.0.0.0 to 255.255.255.255.
> The initial DHCP-Discover will be from 0.0.0.0 as the client doesn't
> have an IP address at this time. It's always to 255.255.255.255 (the
> broadcast address) as it doesn't know the address if the server.
> The server will respond to the broadcast address as well.
By "no traffic to/from the DHCP server", I mean none of the wireshark
DHCP entries has the address of my server as source or destination.
I think Randall C Grimshaw may have told the most likely cause.
> Sounds like the network is suppressing your DHCP, possibly using Cisco
> DHCP-snooping or similar. This would not be surprising in an enterprise
> where DHCP can be very disruptive. Its use should always be coordinated
> your central administration.
I'll try to justify it.
I'm not sure how your network is setup but would like to share this:
if you have a cisco router with different routed interfaces you'll need to
setup a helper-ip on those interfaces telling where it can find the DHCP
This will forward all requests to the dhcp server.
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