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user_cd2592
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Tuesday, December 28th, 2021 6:00 PM

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Comcast IP address changes multiple times in 24 hours

I work at home and need to connect to a VPN for work. To connect to the VPN, my job needs to whitelist my IP address.

They are reporting my IP address sometimes changes multiple times in 24 hours, which is causing VPN connectivity problems. Even though I probably have a dynamic IP address through Xfinity, they say more than 1 IP address change in 24 hours is unusual. I am reportedly the only person at the company that is happens to.

I have non-business services through Xfinity. I use a Motorola router. Probably unrelated but on my personal, non-work computer I use a 3rd party VPN for online privacy.

Could the Motorola router be changing my IP address multiple times in 24 hours? Xfinity because they are reacting to personal or business VPN usage? Or is this normal? Thanks.

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3 years ago

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EG

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108.6K Messages

3 years ago

The WAN / public IP address gets changed by the ISP's DHCP server, not by the device itself.

If you need a concrete public IP addy, you'll need to switch to a Business Class Service subscription which assigns a static IP addy rather than a dynamic one.

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user_cd2592

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3 Messages

3 years ago

Thanks, so that rules out the 3rd party router if I'm not mistaken.

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EG

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108.6K Messages

@user_cd2592

Yes. On residential service, all IP addresses are dynamically assigned whether the modem is rented from them or retail purchased / customer-owned.

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer!tick

3 years ago

Mellonpopr

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47 Messages

3 years ago

even with dynamic IP, it shouldn't be changing unless you leave your modem without power for more than say a day or two depending on the DHCP lease

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user_cd2592

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@Mellonpopr

Thanks, I do turn the modem off for ~12 hours each night to save electricity and prolong the life of the (cheap) modem. This is probably atypical home internet user behavior. I will try not turning it off and see what happens.

3 years ago

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Mellonpopr

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47 Messages

Definitely worth giving it a shot...of course if you have a prolong power outage in the area or if Comcast were to restart their DHCP services etc... the IP can still change so the static IP with business class would be best if you're going to require that VPN daily/long term and don't want to drive your IT dept bananas :)

3 years ago

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EG

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108.6K Messages

@Mellonpopr

even with dynamic IP, it shouldn't be changing unless you leave your modem without power for more than say a day or two depending on the DHCP lease

Not necessarily just that condition. It can change at any time if Comcast decides to do any maintenance / upgrades / updates to the local system / infrastructure. 

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer!tick

3 years ago

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EG

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108.6K Messages

3 years ago

Marked "Solved" topic now being closed.

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