Update the public IP address to reflect the new location or configuration.
Update the public IP address to reflect the new location or configuration.
You can update your public IP address through your Xfinity gateway settings or by adjusting the DHCP configuration on your bridge device. Check your router or gateway documentation for steps specific to bridge mode.
You might find someone with deeper expertise on Xfinity Gateway modems offering helpful advice. Usually, turning off your modem briefly and then reconnecting can reset your connection, allowing your ISP to assign a fresh IP address as your previous one is claimed. You can't choose a specific public IP unless you opt for a business internet plan.
Note: Using a VPN service such as Private Internet Access lets you route your traffic through their servers, effectively switching your public IP to theirs.
If you're using the Xfinity gateway in modem/router mode, it's unlikely to work. They don't support MAC address cloning. Your best option is to check the settings and see how long your DHCP lease lasts for your public IP. Make sure your modem is off and wait until the lease expires—you might get a fresh IP. Comcast assigns IPs based on the MAC address of whatever device connects to the modem. If you have both a modem and router, they function together. For me, I own my own standard modem and don't rely on the gateway. If I switched routers, I'd get a new IP from Comcast.
DHCP is a system that distributes IP addresses. Comcast doesn’t provide static IPs for home users. Yes, they employ a DHCP server. Your router includes an integrated DHCP service for your network. The image referenced is for a modem, not a modem/router setup. Refer to the DHCP section since Comcast utilizes it to assign dynamic IPs. Cable Modem Status Signals Configuration Logs Open Source Assistance This page explains how the cable modem starts and what to do if issues arise. If problems persist, check the Help area for troubleshooting steps or contact your provider. Task Status DOCSIS Downstream Channel Acquisition Completed DOCSIS Ranging Completed Establishing IP connectivity via DHCP Completed Time of Day Completed Transfer Operational Parameters via TFTP Completed Register Connection Done Cable Modem Status Operational Initializing Baseline Privacy Done Cable Modem Operation Current Time and Date Aug 08 2018 21:29:31 System Up Time 8 days 20h:53m:0s
Sure, I'd be happy to help you with that! Just let me know what you need changed.
But i'm using it only as a modem and have a router connected to it.
Contact Comcast directly and request a DHCP release. Mention you're dealing with DOS attacks or similar issues. Companies often have temporary leases lasting minutes or hours, so waiting time depends on your connection. Most providers don't extend beyond 24 hours due to limited IPv4 addresses, making a full 24-hour shutdown a practical option. In my experience, simply reaching out to your ISP is the simplest solution.
Utilize the MAC address cloning option on your router if available. Assign the MAC address of another device on your network. This will generate a fresh IP address from Comcast. Alternatively, you can contact them directly. Be aware that IPv4 addresses have largely been exhausted, so Comcast may not be able to assign new ones. It's uncertain, but some users have shared similar experiences with varying success.