Help configuring a static IP with DPC3939

Small correction, we are using  "Model: Cicsco DPC3939B"

Hello jmgriffin and welcome,

First, Comcast has installed the DPC3939B (DPC) StaticIP into that Comcast Gateway. You can look at this by logging into the DPC through any computer connected to any of the rear LanPorts 1-4, bring up a Browser, type in 10.1.10.1, then username=cusadmin, password=highspeed. Then click on connection, then WAN or WAN status and you will see the StaticIP Gateway address and subnet mask, DNSs, etc. 

Second, if you need to program your static IP into one of you devices like webserver, camera server, etc., just go into that device's wired network configuration (this is usually within the NIC adapter TCP settings) and click on Static IP, enter in your Static IP Routeable, Gateway, SubNet Mask, DNS addresses, save then reboot this device. You must make absolutely sure that this device in Enet cable connected to any of the DPC LanPorts 1-4 interconnects. After you reboot this device you should be able to bring up a browser to access the Internet for starters.  The final test is for you to go up to the Internet on any computer and try to ping your StaticIP Routable Address. Ithese both work, then you are golden. 

Lastly, please be advised that if you want to use your Private and Public WIFI, it is mandatory that you keep your DPC LAN DHCP server enabled. 

Hope this helps you out.

so the "usable" static IP that Comcast gave you is intended to be configured on a separate router or server. the "Comcast gateway modem" address has already been assigned to the DPC. in general, you should not be experiencing drops, whether you have a static IP or a dynamic one, and i personally might question the accuracy of what that representative told you.

to start, when these drops in connection happen, does it happen for everyone simulatenously, or is it isolated to particular computers? also, are your machines/devices connected wirelessly or wired? if wireless, how far away are the machines from the DPC? as well, could you possibly post the signal levels from the modem (they are at http://10.1.10.1 -> Connection -> WAN Status (i think that's the wording of the menu options))

"i personally might question the accuracy of what that representative told you."

I am begining to think more along these lines. What else could be causing this issue? Might swapping the DPC3939 hardware fix the problem?

Thanks,

Jeffrey

Hey jmgriffin,

If you are still seeing these intermittent drops, I would recommend you procede as follows:

1. Connect a computer to any DPC LanPorts 1-4 Enet interconnect, bring up browser, go to 10.1.10.1, then use username=cusadmin, password=highspeed.

2. Next click on Connection, then click on WAN or WAN Status to insure that  your Primary (75.75.75.75) and Secondary (75.75.76.76) DNSs are mannually assigned (programmed) in. If you make changes click save button.

3. Next click on LAN or Lan status, click edit and make sure the LeaseTime=FOREVER and DNSs are mannually assigned ( programmed) within. If you make changes clcik save button.

Let us know if you are still having issues.  Thanks.

 VBSSP-RICH,

Thank you for the suggestion. I tried that but we are still experiencing the intermittent service drops. As a result most of our users have switched back to our DSL connections just so that we can continue to conduct business. I am thankful that we did not cancel the DSL immediately.

Do you have any other suggestions? I am very near contacting our Comcast sales rep to issue the cancellation orders on our service.

Thank you,

Jeffrey

it issue happened to us,end up I have it replaced. as reason I finding that this new Comcast Cisco Modem with WIFI DPC3939B wouldn't support  Internet routable static IP address or using pseudo bridge mode for my case. I applied the same configured with previous NetGear Business Gateway Modem, it works like charm! therefore, don't use COMCAST Cisco Modem if you need routable static IP, unless you know how to make it works, then please share it.