Network Printing Problems – IP address changed

65 pts.
Tags:
IP address
Nashuatec DSM730
Network printing
Windows Server 2003
Hello again, I've spent the last few days racking my brain over this one, but here goes. We're running Windows Server 2003, Enterprise edition at work. I installed a printer on Friday morning, Nashuatec DSM730 - printer / photocopier to the network, with no problems - as DNS / DHCP was enabled the printer was allocated it's IP Address and it was a simple process to set up users workstations (Windows XP Pro) TCP/IP setting / connecting to the printer / copier. Anyway - I got a phone call in the afternoon that another Nashuatec, which was installed many months ago / connected to the network (On the 2nd floor of the building and working fine had stopped printing. When i checked the printer and the user terminals, the IP address on the printer had changed (just the last two digits) and was different to what was being shown on the terminal computers. I have tried amending the IP address on the user terminals, as well as deleting the old printer / settings from the PC, but the printer is failing to print. It is showing as connected and 'ready' in the printers and faxes window, but is failing to printe - with a connection time out error. I have linked a PC on the 2nd floor to the new printer i have installed and this has worked fine. However, yesterday morning when the staff returned to work, the IP address had been changed (just the last to digits). I have accessed the printers IP / Network settings / having turned off / unplugged the printer from the network initially, the Auto DNS / DHCP is set, so the printer is picking up an IP address. However, when I click 'test connection' - the printer is saying there is no connection to the server. I'm a novice to networking, and was wondering if there was anyway i can check - server side why it is not picking up the printer. I'm also aware that the problem may lie with the printer, as i've explained that the printer is not connecting to the server. I must also state, that i have not amended or changed any of the settings on this printer. The weird thing is, that the printer is picking up an IP address allocated to it, but doesn't appear to be communicating to the server or vice versa. Not sure why it's stopped working all of a sudden and why they are not talking to each other. Your help will greatly be appreciated. THANKS . Pashers
ASKED: October 7, 2008  10:17 PM
UPDATED: October 13, 2008  2:20 PM

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Instead of setting the printer to use DHCP, use a fixed address that is outside of the networks DHCP range. Your router is more than likely where you will find what the DHCP range is. This <a href=”http://ask.yahoo.com/20020206.html”>site</a> explains how DHCP works. This <a href=”http://www.tcpipguide.com/free/t_TCPIPDynamicHostConfigurationProtocolDHCP.htm”>site</a> has a bit more information about DHCP. On my home network I have the computers set to use DHCP, and my two network printers use static addresses. Remember: <b>It is VERY important to make sure that the static addresses you choose are <i>outside</i> the DHCP range</b>.
Good Luck!
-Flame

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DHCP provides for the ability to distribute fixed IP addresses. It is called a reservation. The reservation relies on the MAC address of the device as that is the only information in the DHCP discover broadcast packet. The DHCP server sees this information and provides the reserved address in the DHCP offer broadcast packet. The device then accepts the offered address in a DHCP request packet and the DHCP server ACKs the acceptance of the reserved address. Remember the acronym DORK – Discover, Offer, Request, Acknowledge. We use DHCP for almost all the printers on our network. It is much easier to manage from the central location. We also typically have the printers in their own subnet and set the lease time longer (30 days) than clients (7 days).

Bottom line – setup a DHCP reservation on the DHCP server using the MAC (hardware) address of the printer(s). Then the clients will always be able to connect to the printer at the same IP address provided the printer is online and has network connectivity.

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  • Pashers
    I am wondernig also, How the IP address could have changed - all of a sudden. As well as the settings on the printer to a point where it is unaccessible from a computer on the network. Any ideas?
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  • Labnuke99
    DHCP does not always give a client the same address from one renewal to the next. DHCP rebinding actually takes place at 50% of the lease time and renewal takes place if the client does not get a response when the lease time is finally over. See this article for more details about how DHCP rebinding & renewal works. So, if the IP address assigned is different than the print queue was setup on, the clients will be unable to reach that host. This is the purpose of DHCP reservations. The DHCP reservation is handled on the DHCP server, not the client. The client is simply set for DHCP and the server has the intelligence then to always assign the same IP address to the same client based on its MAC or hardware address.
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  • Pashers
    Hi mate, That makes sense. Thank you. Ok - I've changed the clients PCs to the new IP address allocated by the DHCP server. Bearing in mind the settings are automatic on the printer and it is picking up an IP address allocated, when a connection test is done - this is failing, so it appears the printer / copier has lost it's outbound connection to the server, but confusingly, is picking up an allocated IP address. I imagine this is the reason the client PC's cannot connect to the Printer / copier as it is not communicating with the server! I have checked the printer and it is now holding the allocated IP address given to it by the DHCP server. Would it be worth setting the printer / copier back to it's original factory settings, when it was delivered? However, it seems this is a little drastic and not something i would like to do. Why is it picking up an IP address and then - as it appears to be - not communicating with the server? I assumed as the connection on the printer settings were automatic, this would set up all the necessary config settings allowing PC's to be able to communicate with it/ Look forward to hearing from you again. Thank you Pash
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  • Labnuke99
    You will also need to modify the print queue settings on the server. These will need to point to the reserved IP address of these devices.
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