The theory was FIFA wanted some batshit amount of money for the franchise which EA decided not to cough up.This hasn't been confirmed as far as I know, but either way it's greedcorp vs greedcorp.
Yea it's likely more complicated for them.The whole thing is bullshit if you ask me and territories should be on equal footing with provinces.The royal oath should be abolished country wide.
NAT hairpin, also called NAT loopback
If you're sending packets to your ISP's public IP from inside your LAN and it fails, your ISP modem (or whichever device does the NAT, probably doesn't support NAT hairpin.
Split-horizon DNS
That's when you configure your own DNS for your hosted services, but with a different config on your LAN (which would point towards your services LAN IP) and another config with your public DNS provider (which would point to your public IP)
Carrier NAT
This could break your chances of having a reachable service as they likely won't make a port forwarding rule for you in their stuff.
IPv6 address types
Link-local addresses are within fe80::/10 (kinda similar to how 169.254.0.0/24 is used in ipv4). This IP wouldn't be reachable from the outside.Global unicast addresses are all in 2000::/3, this would be reachable from the outside.
5.IPv6 DNS
Make sure to configure both A (ipv4) and AAAA (ipv6) records with the right info. Although if your LAN devices only have ipv4 addresses and you're doing Split-horizon, you could theoretically omit the AAAA on your LAN
Phone DNS shenanigans.Some recent phones ignore the DNS they receive through DHCP and instead use something like Google's which breaks split-horizon and can confuse troubleshooting. This wasn't in the SSID settings, but in a global "private DNS" setting.
As for your problems, it depends.There might be a way to make this work without the VPS, but I don't have all the info.That said, a VPS or something like a cloudflare tunnel could come in handy. I usually prefer to host directly but still, that's an option if port forwarding doesn't work with your ISP.You'd configure the DNS for your services to the VPS IP and configure the VPS to reach your stuff.Using the VPS kinda also gets rid of NAT hairpin problems although it is inefficient to go through the VPS from the LAN with the downside of not working when your Internet is down.You can still use the VPS and Split-horizon DNS if you wanna have local availability from your LAN when your Internet is down.
5 Gbps is the theoretical PCIe 1x limit, but I haven't seen those in a while, so probably not that.
I'm... half tempted to ask you if you can reverse the cables in the path lol.Maybe a pair somewhere isn't as good as the others and affects data rate in that direction.Far fetched, but..
Use the -P flag to set the number of parallel streams. Probably, TCP windows size is limiting you on a single TCP connection but multiple connections would work fine.
IMHO it's not just about the messages but whatever else the app might have access to just by being installed on your phone.