No.
I try to explain it. But you will have to deal with it yourself in order to understand it.
The crucial difference between a public and private IP address is that the public IP can be seen by other devices on the Internet, while the private IP cannot.
Therefore, public IPs are used to interact and communicate online, while private IPs operate within a local network.
A public IP address is an outward-facing IP address used to access the Internet. Public IP addresses are provided by an ISP and assigned to the router. It is a unique IP address on the Internet.
Yes.
I think that this MikroTik router is connected to the internet through Cogent, so a gateway, and it is NOT WITH YOU. But probably with your âISPâ from âISR Communicationsâ, who is not an ISP at all, just someone who distributes and redistributes data that he received elsewhere (from Cogent). And who will NEVER be able to give you a public IP because he ONLY has ONE himself. And he needs it himself to split the data received from Cogent with his MikroTik router and forward it to different customers in a PRIVATE non-public network behind his MikroTik router.
Everything behind it is PRIVATE, including your home network, and CANNOT be accessed from the Internet. So your core cannot be reached via ARC either.
Here is some more explanation so you can compare and see that there is only ONE public ip address involved: 82.192.6.1
ALL OTHER addresses belong to a PRIVATE non-public network, hosted by ISR Communicationsâ MikroTik Router.
But you canât tell from a distance.
You wrote before:
Maybe your man actually got a public ip for you via Cogent - or he could still do it - and just doesnât know if and how he can pass it on to you.
He could possibly try to get help with this from Cogent customer service.
I have put your points to my âISPâ who has gone very quiet. I will give him a few days, but I am thinking that I need to find a proper ISP. It will have to be via 4G, which might come with its own problems but I feel now ready to be an informed buyer.
Thanks all for your endless patience.
Once I get this sorted, I will post a wrap up of how it turns out, just in case someone googles a similar problem in the future.
Just in case, you should make sure you get a public dynamic ip for cellular.
It is not self-evident that a provider offers this possibility, but rather rarely.
Good luck!
Sorry Iâve been absent. A few random comments. Your ISP is cool. People who do this WISP stuff are cool
Although⌠there are a ton of different configurations and weird ways of building a WISP. From the original answer it really did sound like the guy was assigning you a public routable IP (needed for ARC). But, with all your troubleshooting it looks more and more like this isnât the case. Something is a miss.
Try asking him the following: âI have a server on my network that needs to accept and respond to unsolicited TCP connection requests. All testing shows no client attempts are getting to the 82.128.6 network you said was my public IP.â
MikroTik is a router manufacturer that is well respected. They are quickly gaining popularity now the Ubiquity Edgerouters are almost not a thing. I donât have any first hand experience with them because the one I want to play with seems to be perpetually out of stock.
I have no idea why your ISP wouldnât have a firewall rule to block access to their router BTW. Maybe thatâs concerning.
Cogent⌠good people⌠interesting company
Anyway, if your ISP canât answer questions / help with this then it will continue to be a mystery.
Before switching ISPs have you tried one of the VPN solutions like tailscale?
If you followed my suggestion of 1 hardwired machine fing should not have worked
But, this config does help to verify that you might actually have a public routed IP. You need to login to your router to verify though and rely on external tools to âdiscoverâ your topology.
If he was willing, he could set-up the port forwarding to fix ARC on behalf of his customer but we need to ask the right questions. But, yes, there is some unanswered topology questions here.
A routine check of automated diagnostics from your ARC account suggests that you might still be up against the port forwarding issue.
Cogent operate a significant portion of the domestic and international network connections in Spain, rivaling Orangeâs OpenTransit and several other players for market share, and doubtless implement some form of carrier-grade NAT for most of their residential-tier accounts.
If youâre considering switching providers, several customers in Spain have found success with other mainstream providers, including the basic residential modem/router package from Orange ES (the Livebox+).
Please let us know if youâre having continued issues, and the tech support team is watching this read to promptly assist.
I have tried Vodafone at another address and everything worked instantly and automatically.
Cogent itself got in contact with me to tell me all was well. It was not and I managed to convince them it was a problem at their end thanks mostly to the help I got from this thread. I sent the IP address of their router that was the second NAT. They went âah, fair point, we will get back to youâ. That was a week ago.
