ISP Changes to Dynamic IPs (Affecting Plex Servers using Dynamic IPs)

Plex Media Server Remote Access
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Accountment about ISP Changes to Dynamic IPs

Please be aware that if you are not using a static IP address you might be affected or eventually affected by these recent ISP changes in different countries.

ISPs have started using a feature called “CGNAT” to reduce the number of dynamic IPs they need to issue to customers by sharing a single dynamic IP with multiple customers by giving them private IPs linked to the same dynamic IP.

Background about CGNAT:-

Carrier-grade NAT (CGNAT, also known as large-scale NAT), is a method of sharing a single unique public IP address with multiple services to allow providers to extend their pool of usable IPv4 addresses. This means your modem or router will be assigned a private IP address instead of a unique public IP address. Our network will then translate that into a shared public address allowing you to access the Internet.

In summary if you want to host something & your ISP is using CGNAT you will either have to ask your ISP to disable CGNAT on your internet service or pay additional for a static IP.

To find if your ISP is using CGNAT you might need to google it or contact the ISP.

Give a like is this post was helpful :slight_smile:

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If you are affected by this CGNAT you won’t be able to directly play any content and no firewall rules etc will work to get around this issue.

So technically you will have to use Plex Relays or contact the ISP to get a static IP OR see if you can opt-out of CGNAT.

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It’s simple to diagnose, if your constantly losing remote access Green tick in Remote Access Settings, with the correct network settings. This is a sign you have Carrier grade Network Address Translation, in short (CGNAT). If you require quality Remote Access, it’s time to call your ISP as jman177 said.

Your Choice:

  1. Opt out, (free)
  2. Static IP, (which normally comes with a fee per month)
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FYI: ISPs have been using CGNAT for several years now. This is not new.

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Somehow you forgot about ipv6… lol

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Thank you everyone to add

  • The ISPs in my country have only just introduced/forced this feature but understand it’s an old feature.
  • Yep def right IPv6 will save us but for some ISPs it currently an opt-in feature
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Hi!

Another options:

1 - Use VPN ( Torguard is good for it)
2 - Use Tailscale and create a network
2 - Use Cloudflare Tunnels (it´s an option but not recommended)

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You are not alone. IPv6 is the “Future of the Internet”.
Since about 25 years.

And it looks like it’ll be continuing to be just that for quite a while.
If you look how reluctantly all involved parties are implementing support for it. IPv6 support is still a patchwork, with some parts of the net having full support, but many parts still only having half-*ssed or incomplete support. It wasn’t too long ago that I was asked by my regional ISP why I wanted IPv6 on my connection.

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At least they asked… seems to be obligatory for many ISPs (at least with new contracts). I’m just happy my main Plex clients have been working fine with IPv6 for some time :crossed_fingers:

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