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Kaytu
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49 Messages

Sunday, May 25th, 2025 3:38 PM

New public IP address?

I'm seeing constant attacks against my network (specifically a NAS I have) via my Ubiquiti Unifi UI that started yesterday. 

Most of the attacks are being blocked by the Ubiquiti UDM Pro via geolocation blocking, but I don't like what I'm seeing.

I'd like to get a new public IP address to (hopefully) stop the attacks. 

I'm on with Chat now and the suggestion to unplug the modem didn't work- tried that for 30+ minutes, and they insist that ipconfig /release, ipconfig /renew will get me a new public address 

Anyone have any luck getting a new address? 

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Updated 

21 days ago

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BruceW

Gold Problem Solver

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26.5K Messages

25 days ago

Release/Renew is not likely to be helpful. When used with a standalone modem or with a Comcast/Xfinity gateway in bridge mode Release/Renew would perhaps change the public IP. Even then, there's a good chance you'll just get the same IP back again. When a gateway is not in bridge mode Release/Renew would perhaps change the user's local/private IP, but not the public one.

https://www.reddit.com/r/Ubiquiti/comments/mfgppn/yes_is_it_possible_to_change_the_wan_mac_address/ provides steps to change the UniFi MAC address which, for a device configured to use DHCP, should result in a new public IP being assigned.

If you are using a straight cable modem you'll need to reboot your modem after changing the UniFi's MAC address.

If you're using a rental Comcast/Xfinity device, they do not provide a way for customers to change their public IP, and they won't change it for you, so you'd have to:

  • swap out the rental gateway for another, or
  • place the rental gateway in bridge mode and reboot, or
  • replace your rental gateway with a straight cable modem
Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

(edited)

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XfinityRichard

Official Employee

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2K Messages

23 days ago

Hi there, @Kaytu. Thank you so much for your time and patience! I do apologize for the inconvenience you are experiencing. Since it's been a few days since you last posted, are you still needing assistance? If so, please don't hesitate to reach back out.-Richard

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Kaytu

Contributor

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49 Messages

@XfinityRichard Yes, I'd still like to update my public IP address.  If I follow the above to spoof a MAC address, I'm afraid I'll lose connection.  If a new lease can be assigned from DHCP, it would be optimal.

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22 days ago

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XfinityChelseaB

Official Employee

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1.8K Messages

Hello @Kaytu, If you could send our team a direct message with your full name, the name listed on the account (if different), and the service address associated with your account, I'd be more than happy to look into this for you. To send a Direct Message, please click on the chat icon in the top-right corner of the screen, next to the bell icon, and then type or select "Xfinity Support" to initiate a direct message.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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22 days ago

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train_wreck

Contributor

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58 Messages

@Kaytu​ Spoofing your MAC address is the only way to get it done I'm afraid. AFAIK the support reps can't change anything about the lease. But I've done it loads of times, just make sure to reboot your modem after changing the MAC and you'll be fine, you won't lose the connection.

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22 days ago

Kaytu

Contributor

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49 Messages

Hi @train_wreck  Spoofing the MAC address is new territory for me.   What should I use for a new MAC id?  Existing modem MAC and change the last character, or make something up completely random?

Thanks!

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22 days ago

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train_wreck

Contributor

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58 Messages

@Kaytu​ well honestly, all that REALLY matters is that you don't input a MAC that is exactly identical to someone else on the Comcast system in your area. I've usually just taken the MAC of one of the devices I own (a desktop/laptop device, for example) and changed a single character in that. But to be honest making one up entirely at random would probably be just as good. 

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21 days ago

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