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Roberto Manfreda
Asked: 2021-05-11 22:04:48 +0800 CST

Unable to route ports, ISP assigned private address - connection down issues every 4 hours

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I have a big problem, I live in an area where there is no fiber or ADSL connection and I connect to the internet using a 4g+ sim in a 4g+ router (Tp-Link Archer MR600). The connection is just fine: ping ~50ms - dw 240mb - up 50mb but there are a couple of issues that are driving me crazy.

  • My ISP does not assign me a public static IP, I have a private IP maybe they are using a double NAT or CGN, I don't know.
  • My connection goes down and up, every 4 hours, they do some sort of IP update for I don't know what reason.

I can't open doors, host anything, access video surveillance cameras remotely and a lot of other things. I am paying a lot of money for the contract, and this is the only ISP with decent bandwidth and stability, but what I have listed above prevents me from doing a lot of operations. For example if I am connected to a VPN every 4 hours the connections are interrupted, and I have to reestablish it manually.

Maybe (surely) there is someone here who has a better knowledge and I will be happy if someone wants to give me some clarification or even better some tricks to make things work.

Ask me if you need some kind of output I will post it.

As another note feel free to give any suggestion, I don't know what can be useful. Some kind of connection mesh, VPN or any other solution should work I will give it a try.

Maybe could be a wrong configuration or something similar but I don't think so, the ISP is locking me in some way.

Things that I tried:

  • IP address reservation
  • Connecting 2 routers in cascade
  • MAC address cloning
  • DMZ
  • Static routing

Thanks.

networking isp

1 Answers

  1. Best Answer
    1. Many ISPs in their basic contracts simply have a limited consumer internet user in mind and will purposefully break things for everyone trying to use their uplink as a proper internet connection.
      • You might be able to switch your contract to one geared towards hosting.
    2. Many ISPs stopped caring about getting everything right for IPv4 users as soon as IPv6 became preferred and thus their carrier-grade NAT solutions for using their limited IPv4 pool will simply break everything but the most simple use cases.
      • Avoid CGNAT limitations by using IPv6: if necessary, configure your VPN client to prefer IPv6
    3. Manage your expectation. 4G is not a cable: Phone companies expect that they can online/offline towers however they please because phones can generally deal with that. Atmospheric influence on 4G is only partly mitigated.
      • Because of the uplinks inherent limitations in terms of reliability, making sure your VPN client can swiftly reconnect and just living with the occasional latency spikes may be more cost-effective than convincing your ISP to become as reliable as few other 4G customers are willing to pay for
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