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Dpc3939b login

By | 10.10.2020

Since this firewall blocks incoming connections you may need open a port through it for certain games and applications. This process of opening a port is frequently called a port forwardsince you are forwarding a port from the internet to your home network.

We think that forwarding a port should be easy.

Configuring the Comcast Cisco DPC3939B / DPC3941B Gateway

That's why we created Network Utilities. Our software does everything that you need to forward a port. Get Started Now! It is important to setup a static ip address in the device that you are forwarding a port to. This ensures that your ports will remain open even after your device reboots. Your router has a web interface, so you will login to it using your web browser. It usually does not matter which browser you choose to use. Open up your web browser and find the address bar.

It should look something like this:. In the picture above the address bar has Your router's IP address can also be refered to as your computer's default gateway.

After entering the IP address of your router you can simply press enter. If all goes well you will see the following screen:. If your username and password do not work then please visit our Default Cisco Router Passwords page.

Now we need to find the port forwarding section in your router. Here's how you do it. Starting from the first page in your router:. You need to name this entry in the Service Name box. The name does not make any difference in the forward; it's just there so that you can remember later why you setup this forward. Select the protocol type of the ports you are forwarding from the Service Type box. Note that if you are forwarding ports so you can run a program on a device other than your computer then you can enter your device's IP address into that box instead.

If you are just forwarding a single port number then you can simply enter that same number into both the Start Port and the End Port boxes.

If you are forwarding a range of ports, usually separated by a hyphen, then you need to enter the lowest number of that range into the Start Port box and then enter highest number into the End Port box.In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release.

If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center TAC or their contracted maintenance providers. To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors.

The information in this document is intended for end users of Cisco products. Home Skip to content Skip to footer. Cisco Security. Advisory ID:. Base 4. A vulnerability in the administrative web interface of the Cisco DPC XB3 router could allow an authenticated, remote attacker to execute arbitrary commands on the affected system and on the devices managed by the system.

The vulnerability is due to improper user input validation. An attacker could exploit this vulnerability by crafting input into the affected fields of the web interface. An exploit could allow the attacker to execute arbitrary commands on the system. Cisco has not released software updates that address these vulnerabilities.

Workarounds that mitigate these vulnerabilities are not available. No other Cisco products are currently known to be affected by these vulnerabilities. Cisco Security Vulnerability Policy. Version Description Section Status Date 1. Legal Disclaimer. Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by these vulnerabilities.

Workarounds Workarounds are not available. Cisco Security Vulnerability Policy To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy.The ideal network involves your Internet Service Provider ISP connecting onsite to a standalone modem that connects to a router, preferably a router recommended by Nextiva. If you have more devices on your network than ports on your router, you can connect a switch to your router to expand the number of ports.

SIP ALG inspects and modifies SIP traffic in unexpected ways causing one-way audio, deregistrations, random error messages when dialing and calls going to voicemail for no reason. This SIP packet, intended for a specific destination, will no longer know where to go, causing one-way audio, dropped calls, deregistrations, and failed transfers among others.

Cisco Comcast Xfinity DPC3939 Manuals

Multicasting: When a call comes into a Call Group and simultaneously rings all phones, the Internet traffic of the internal network spikes. Basically, data coming into the network is sent out to all devices on the network. Since all phones are likely using portthe data spike causes packets to be dropped. This can cause failed transfers, dead air upon call retrieval, among other issues. Nextiva always recommends using the Google DNS servers of 8.

Firewall Access Rules : The simplest way to ensure that traffic is not being blocked is to allow all traffic to and from This equipment, by itself, is not recommended for use with VoIP service. Common issues include one-way audio, dropped calls, failed transfers and deregistrations, among others. This setting is only configurable on the DPCB.

NOTE: The login address and credentials below are the default when the Gateway is shipped and can be modified by your Network Administrator.

If the default credentials are not being accepted, speak with the Network Administrator who set up the network. There are five main areas that you should be concerned with regarding your network. Uncheck the Disable All checkbox if there is a checkmark in the box.

Reboot the router and any devices connected to the router. Need additional help? Click here. Was this article helpful? Yes No.It connects to an ethernet switch just like all my other devices on the LAN do. The LAN is Suddenly, my mail server gets incoming emails and my web server is browseable from Internet. Here is the confusing firewall menu in its default setting:.

Comcast DPC3939B Quick Start Manual

It is by default at Minimum security. Does it mean my servers are totally out in the open? Yet I can't set it to a bridge and I don't want to invest into another router that can support multiple WAN IPs and have one more piece of device to manage.

dpc3939b login

Or anyone please try to duplicate this problem. If it is true, then your server is totally open to the Internet. I can say that if you have multiple not just one static IPs. Say if you have a mail server with port 25 SMTP open, go to mxtoolbox. I do want to add another firewall after the The is supposed to do the firewall job and port forwarding. It is sad that Comcast would just say configuring our internal LAN is our job, hire professional if you can't figure out how.

Current Page. Comcast Business. Cart 0 Loading. Shop Small Business. Sign In. Managing, controlling, and support for Custom Domain Names. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. Occasional Visitor.

dpc3939b login

What did I do wrong? All forum topics Previous Topic Next Topic. How can I get Comcast to answer this question? Anyone reading this please? Did you sort this out? I'm having simialr issues as to setup configuration. Life's too short for bad wine. I thought I was the only one. JeffreyWest, can you please confirm that? Anyone else experiencing the same?Since this firewall blocks incoming connections you may need open a port through it for certain games and applications.

This process of opening a port is frequently called a port forwardsince you are forwarding a port from the internet to your home network. We think that forwarding a port should be easy. That's why we created Network Utilities. Our software does everything that you need to forward a port. Get Started Now! It is important to setup a static ip address in the device that you are forwarding a port to. This ensures that your ports will remain open even after your device reboots.

Your router has a web interface, so you will login to it using your web browser. It usually does not matter which browser you choose to use.

Open up your web browser and find the address bar. It should look something like this:. In the picture above the address bar has Your router's IP address can also be refered to as your computer's default gateway. After entering the IP address of your router you can simply press enter.

If all goes well you will see the following screen:. If your username and password do not work then please visit our Default Technicolor Router Passwords page. Now we need to find the port forwarding section in your router.

Here's how you do it. Starting from the first page in your router:. Enter the name of the program into the Other Service box. It doesn't really matter what you put into this box, but something that will remind you why these ports are being forwarded is be a good idea. It's possible for this to be either the IP address of your computer or any other IP address on your network that you want ports forwarded to.

If you are just forwarding a single port number then you can simply enter that same number into both the Start Port and the End Port boxes.After the upgrade we are experiencing flapping and latency with our circuit see image. Buy or Renew. Find A Community. We're here for you! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for. Search instead for. Did you mean:. We have contacted Comcast although their engineer stated that they are not in control of the software updates and we need to reach out to Cisco to report the issue.

Does anyone know which division at Cisco would be able to handle this issue? TAC informed me on the phone to contact Comcast. Labels: Network Management. Everyone's tags 3. I have this problem too. We are no longer receiving latency or flapping on the circuit. If someone at Cisco pushed this, thank you for fixing the issue. Latest Contents. Created by hiarteag on AM. Why show ip bgp table is not showing any best path with expr Created by upadhyayambition1 on PM.

Created by ciscomoderator on AM. Created by Kelli Glass on PM. However, there Create Please login to create content. Related Content. Blogs Networking Blogs Networking News. Content for Community-Ad. Follow our Social Media Channels.This happened on our old SMC too. It's kind of anoying. I have a script that logs our signals into an RRD graph and I noticed it stopped working a few days ago because the logon credentioals stopped working.

Why does ComCast think it's okay to randomly change passwords on the equipment? This is biz service not residential. Go to Solution. Comcast does not change their default customer login credentials, however, customers frquently do.

It is always necessary to use a computer with an Ethernet cable plugged directly into any of the rear Lanports The standard browser address View solution in original post.

dpc3939b login

I am not sure how your script was running previously or how you are testing it - but that might not be the reason your script stopped working.

I wrote a script that programatically accesses the modem and logs the stats into an RRD graph. It's obvious I know these basic sugestions that are being given.

dpc3939b login

I am the only one with access to the modem so I'm the only one that would change the password and I have not changed the password. We have been fighting with bad service for about a month now so I am litterally checking my RRD graphs every few hours.

My script didn't forget our password out of the blue or change the password. The default static IP for the modem was This isn't a typo or something like that. Right now our internet is down again and it really would have been nice to have access to the modem to check the signals. I'm having to post this while tethered to my phone. I do a lot of that these days.

The script is running on the same machine on the LAN that it's been running on for a few weeks. Nothing has changed Okay so I took a laptop into the server room and plugged directly into the ComCast modem and got an IP from the modem we have a block of IPs and normally use our own router and still couldn't log in Invalid User and still didn't have internet access.

But our block of statics still doesn't have internet access. It goes out about 4 hops and then dies. So the traffic leaves our office and terminates on ComCast's network.


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