Device Not Being Served an IP Address

I have an HP Digital Sender 9100c and it's unable to aquire an IP
Address from the office DHCP server. I run a "private network" in the
office and when I connect the digital sender to it, it has no problem
aquiring an address. I have tried the MAC address of the digital
sender on the work network on a laptop I was able to change the MAC on
and it worked fine. I looked up some information on the DHCP packet
and it doesn't seem to me that it includes any information that is
device specific outside of the MAC. How is it possible that they are
able to "screen" devices with an approved MAC?

On Mon, 08 May 2006 11:16:18 -0700, jack2480 wrote:

> I have an HP Digital Sender 9100c and it's unable to aquire an IP Address
> from the office DHCP server. I run a "private network" in the office and
> when I connect the digital sender to it, it has no problem aquiring an
> address. I have tried the MAC address of the digital sender on the work
> network on a laptop I was able to change the MAC on and it worked fine.
> I looked up some information on the DHCP packet and it doesn't seem to me
> that it includes any information that is device specific outside of the
> MAC. How is it possible that they are able to "screen" devices with an
> approved MAC?

Hi.

This kind of device probably has a configuration menu.
Its IP address might have been already configured on a different
network than your own.

example : your network might be on 192.168.0.x
and device might be configured on network 10.x.y.z.

On DHCP : DHCP does not have special option to ignore IP addresses.
There are special IP address though : The Ethernet Broadcast is one.
You can "register a certain MAC and give it a certain IP." But this
behavior is optional. Check that not all IP addresses in your range
are not already given...

On the Network devices : Verify the kind of device your HP device is
plugged in : Is is a hub or a switch or a router ?
Old hubs might not support a 100Mbps and your HP device require it.
Switches can be configured with some port in different VLANs.
Routers obviously need to be configured properly.
- Also check on full duplex vs half duplex vs "Auto" ports both on
the net box and the HP device interface. Get rid of "Autos"

- Test the patch cord you intend to use for your HP device onto a
different plug and another hosts to be sure it's good...

- I could suggest you use your laptop to test the physical socket used
to connect the HP device.

- Also make sure you dont use "reverse" or "uplink" ports in your network
box.

- Check on the DHCP server console about connexions of the HP device.

Warning : DO NOT change MAC addresses. you're about to enter on
a world of pain!!!
If you end up with 2 devices on your network with the same MAC,
it's hello problem...

Instead, do connect your HP device and register all IP options :

IP address
SubNet Mask
Default Gateway.
DNS #1
DNS #2 (optional)
WINS (optional)

Then try to reset the networking options. Turn off and back on again.
Or even try to configure each option manually.

Hope it help.