Comcast Xfinity Static IP for Business and Home Use

Comcast Xfinity offers static IP addresses for both business and home use, providing a stable and reliable internet connection.

With a static IP address, you can access your home or business network from anywhere using a fixed IP address that doesn't change, making it ideal for remote work or accessing your network from a different location.

Comcast Xfinity's static IP addresses are available in various packages, including the Business Internet 30 Mbps, Business Internet 75 Mbps, and Business Internet 150 Mbps plans.

Static IP addresses are also available for home use, with Comcast Xfinity offering a range of plans to suit different needs and budgets.

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To configure a static IP address on your Linksys router, you'll need to log into the Admin page at http://192.168.1.1 (or your custom IP address, if you've changed it).

You can access the Admin page by typing the address into your web browser, and then following the prompts to log in.

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Once you're logged in, go to the Setup→Basic Setup menu and select Static IP in the Internet Connection Type choice box.

Here's a quick rundown of the settings you'll need to fill in:

Remember to enter your favorite DNS service IP address values, or use the Comcast DNS IPs.

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To configure your WAN (Wide Area Network) for a Comcast Xfinity static IP, you'll need to set up your Linksys router to use a static IP address. This involves flipping the Internet Connection Type from DHCP to Static IP on your Linksys router.

The first step is to log into the Admin page of your Linksys WiFi router at http://192.168.1.1 (or 192.168.2.1 if you've changed the default IP address). You can do this by opening a web browser and typing in the address.

In the Setup menu, go to Basic Setup and select Static IP in the Internet Connection Type choice box. Then, fill in the Internet IP Address, Subnet Mask, and Default Gateway with the parameters specified in the email from Comcast, which should include your static IP address, gateway IP address, and subnet mask.

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For example, you might enter 173.xxx.yy.185 as your static IP address, 173.xxx.yy.186 as your gateway IP address, and 255.255.255.252 as your subnet mask.

You'll also need to enter your DNS service IP address values, such as Google DNS (8.8.8.8 and 8.8.4.4) or OpenDNS (208.67.222.222).

Here's a summary of the required settings:

Click Save Settings to apply the changes.

Comcast uses a coaxial cable network to deliver internet services to its customers.

The coaxial cable network is a shared medium, which can lead to slower speeds during peak usage hours.

Comcast's coaxial cable network is widely available, covering over 40 million homes in the US.

Coaxial cables can be prone to signal degradation and interference, affecting internet speeds.

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If you're experiencing issues with your Comcast Xfinity static IP, the first step is to check your internet connection. Make sure it's stable and not dropping packets, which can cause static IP issues.

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You can also try restarting your modem and router, which can resolve connectivity problems and get your static IP up and running again. This simple fix has worked for many users.

If restarting your equipment doesn't solve the problem, check your IP address to ensure it's been assigned correctly. You can do this by logging into your Xfinity account online or through the Xfinity app.

When you're troubleshooting network issues, understanding how your static IP block works is crucial. Comcast offers 1, 5, or 13 usable static IP addresses, which means the quantity of IP addresses available for assignment to your devices.

You'll need to know the CIDR notation, network address, host addresses, customer usable IPs, network broadcast address, and subnet mask. For example, a /30 CIDR block is allocated to obtain one usable IP address.

Comcast Business Static IP Block Assignment: One (1) Customer Usable IP Example

CIDR Notation: 173.xxx.yyy.184/30

Network Address (ID): 173.xxx.yyy.184

Host Addresses: 172.xxx.yyy.185 to .186

Customer Usable IP(s): 173.xxx.yyy.185

Only one (1) usable IP because the highest host address (.186) is automatically assigned by Comcast to the Business Gateway WAN Internet IP address.

Network Broadcast Address: 173.xxx.yyy.187

Subnet Mask: 255.255.255.252

With a /29 CIDR block, you can get five usable static IP addresses. Comcast Business Static IP Block Assignment: Five (5) Customer Useable IPs Example

CIDR Notation: 173.xxx.yyy.184/29

Network Address (ID): 173.xxx.yyy.184

Host Addresses: 172.xxx.yyy.185 to .190

Customer Usable IP(s): 173.xxx.yyy.185 to .189

Only five (5) usable IP because the highest host address (.190) is automatically assigned by Comcast to the Business Gateway WAN Internet IP address.

Network Broadcast Address: 173.xxx.yyy.191

Subnet Mask: 255.255.255.248

Here's a quick reference guide to help you understand the different CIDR block sizes and their corresponding usable IP addresses:

Keep in mind that the highest usable IP address is always assigned to the Business Gateway WAN interface, so you'll need to account for that when planning your network.

Pseudo Bridge Mode allows your firewall/router to provide LAN DHCP, NAT, port forwarding, VPN, etc. functions under your control.

To configure pseudo bridge mode, you'll need to connect your computer to a LAN port on the gateway and log in with a web browser. The admin page can be accessed at http://10.1.10.1, using the username cusadmin and password highspeed.

Clicking Gateway Summary → Network will display the Internet and Local network settings. Comcast automatically assigns the highest useable IP address, e.g. 173.xxx.yyy.186, to the Gateway WAN Internet IP Address.

Your Static IP Block in CIDR notation (/30) is also displayed.

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To configure your Linksys router for Comcast Xfinity's static IP, you'll need to access the router's admin page. Log into the Linksys WiFi router at http://192.168.1.1, unless you've changed the IP address like I did for added security.

The first step in the configuration process is to select the Internet Connection Type. Go to the Setup→Basic Setup menu and choose Static IP from the dropdown.

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You'll need to fill in the Internet IP Address, Subnet Mask, and Default Gateway with the parameters specified in the email from Comcast. For example, the IP address might be 173.xxx.yy.185, the gateway might be 173.xxx.yy.186, and the subnet mask is typically 255.255.255.252.

Don't forget to enter your DNS service IP address values, or use the Comcast DNS IPs if you prefer. I used 8.8.8.8 and 8.8.4.4 for Google DNS and 208.67.222.222 for OpenDNS.

Here's a summary of the required settings:

Click Save Settings to apply the changes and enable Internet access on your Linksys router.

Remote access to your LAN clients via a static IP address is a game-changer for remote monitoring and management.

To enable remote access, you'll need to subscribe to Comcast's Static IP Service, which will give you an Internet routable static IP address.

Configuring pseudo-bridge mode on the Comcast IP Gateway is also required, which involves disabling the gateway's firewall, NAT, and DHCP features.

After configuring pseudo-bridge mode, the DDNS agent in your router can update the Dyn Remote Access service with the Internet routable WAN IP address.

To access your LAN clients, you can use the static IP address or a DDNS host name and port forwarding, e.g., https://myhost.homedns.org:443 or https://173.xxx.yy.185:443.

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If you're experiencing issues with remote internet access, it's likely due to the Comcast Business IP Gateway operating in Router Mode. This assigns a 10.1.10.x private IP address to the Linksys router WAN interface.

The problem is that this private IP address is not Internet routable, making it impossible to access your network remotely. To resolve this issue, you'll need to subscribe to Comcast's Static IP Service.

Comcast Business Class Internet requires a NETGEAR CG3000DCR IP Gateway, which is a cable modem and router combo that runs custom firmware. However, this gateway does not support true Bridge Mode.

Instead, you'll need to configure the gateway for pseudo-bridge mode, which disables the firewall, NAT, and DHCP features. This will allow the DDNS agent in the Linksys router to update the Dyn Remote Access service with the Internet routable WAN IP address.

To do this, you'll need to call Comcast and request that they remotely reconfigure the gateway for you. They will also need to activate the Static IP address, which can take 3 to 5 business days.

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Once the Static IP address is activated, you'll need to configure the Linksys router to forward traffic to the correct port. This can be done using a DDNS host name and port forwarding, or by using the static IP address directly.

Here are the steps to configure pseudo-bridge mode on the Comcast IP Gateway:

Remote LAN Access is a powerful feature that allows you to access your local area network (LAN) clients from anywhere in the world.

You can access your LAN clients by mapping Internet requests from a static IP address to a private LAN IP address, using a dynamic DNS (DDNS) host name and port.

For example, you can access your LAN clients via a DDNS host name and port, such as https://myhost.homedns.org:443.

Alternatively, you can access your LAN clients directly with the static WAN IP address of your router, such as https://173.xxx.yyy.185:443.

Unused ports can be assigned to LAN clients to avoid conflicts with other network services, and can be configured in the future for access to devices like the CG3000DCR gateway.

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Business customers can choose from two types of modems: a cable modem and a DOCSIS modem.

Comcast Xfinity offers a range of business plans that include static IP addresses.

Business customers can use static IP addresses to host their own websites and servers.

Static IP addresses provide a dedicated and consistent IP address for business use.

Comcast Xfinity offers a static IP address for an additional monthly fee.

Business customers can also use static IP addresses for online gaming and VoIP services.

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