Ricoh 6430DN printer unable to establish Ethernet network connection

I have been trying to get a Ricoh 6430DN printer to connected to a Comcast cable modem so that it will be accessible to other computers on the same network.

I have connected two known good network cables from the Ricoh printer to the cable modem and have programmed both a static IP address (on the same subnet) and a DHCP address to this Ricoh network printer.

The network port on this printer and the network port that the printer is plugged into on the cable modem all have flashing connectivity lights. We have also plugged the printer into all 4 of the ports on the cable modem but the printer is still not accessible on the network.

When the printer has a static IP address it is unable to be pinged or to be connected to using a web browser.

When this printer is given a DHCP address its IP address is listed as being (which isn't on the 10 subnet that the cable modem is on) and is also unable to be recognized on the network.

I have called Ricoh support and they haven't been able to get this issue resolved.

What else can be done to fix this issue so that this Ricoh printer will be able to communicate with the rest of the network while it is plugged into the Comcast cable modem?
IT GuyNetwork EngineerAsked:
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wyliecoyoteukConnect With a Mentor Commented:
network settings pageLook at this image.
these are the settings that are probably at fault.
make sure that the ethernet port is enabled, not the wifi (only one can be used ).
failing that, try changing the network speed. auto-negotiation often fails when the switch (in this case the comcast modem) is a little fussy.

If that fails, try connecting it directly to a computer
wyliecoyoteukCommented: is the default address for the printer.
Which means that it is not receiving an automatic IP address.
some of these printers need to be power cycled before network changes come into effect.

I assume the cable modem is actually a router.
Is the router set to issue DHCP addresses?
It may be an auto negotiation failure, in which case try lowering the network speed on the printer to 10mbit half duplex, and see if it connects.
How many devices are on the network? And how large is your DHCP pool? I have seen more than a few instances of people having trouble when more than a certain number of devices are connected to the Comcast modem (I want to say in the neighborhood of about 6). However, if the Comcast unit is configured as a passthrough and another router or firewall is used, then the issues go away.
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JohnBusiness Consultant (Owner)Commented:
Also I would be much inclined to maintain a static IP address for  the printer so that it does not collide with other computers. Then make sure your local firewall permits that address.

I do not understand why you cannot ping except (a) a firewall blockage or (b) there may be a hardware issue with the network card.

Can you do a full reset of the printer to bring it back to factory defaults.
Does the printer show in the router's web interface?
it might help to list:
the router's internal address range
the Ip address of a computer on that range
The subnet mask
Jackie ManConnect With a Mentor Commented:
Do you have admin credentials for Comcast cable modem? If no, it is not possible to allow printer sharing by connecting the printer to the cable modem.
Jackie ManCommented:

Can you ping from one connected device to another which are both connected to the Comcast cable modem?

If no, it is very likely that AP isolation is enabled at the cable modem.
IT GuyNetwork EngineerAuthor Commented:
Yes I have the admin credentials for the cable modem.

I am able to ping any of the other printers and computers connected to the cable modem.
JohnConnect With a Mentor Business Consultant (Owner)Commented:
Did you reset it to Factory Specs?  That may help you set it up properly.
Jackie ManCommented:
Can you post back the screens inside admin portal of the cable modem?
Jackie ManCommented:
Pinging and connection can be different things. There might be some network protocol restricted by the cable modem.
masnrockConnect With a Mentor Commented:
Have you tried any of the following:
  1. Replacing the network cable to the printer
  2. Verifying that IPv4 is Active. Make sure to do this before the next step.
  3. Connecting the printer to a different router or network? If it still will not work, then there's a good chance the problem is hardware related

Assuming that in step 3 things start working AND it still won't play nice with the Comcast modem...
  1. Configure the Comcast modem as a passthrough.
  2. Connect a router that you have to the Comcast modem, and configure it with appropriate settings.
Bet you won't have any issues with that printer. I've seen Comcast units just not play nice with some devices, and others that just won't accept more devices beyond a certain number.
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