Mario

I wouldn't feel confident enough in the quality of their WAN connection to rely upon a cloud based service. Common ports is a good idea, I'll have full control over what ports to run this stuff, so maybe it skirts their firewall rules. I don't think it's common for DHCP leases to expire and upon renewal give you back something different, right? I guess if I actually get a stable feed and it cuts out that's something to watch for. A dropped connection would be a reason to run back. Using an old phone at least there's no large investment in equipment needed to try this. 3D print a stand for the phone, bring an extra phone charger and I'm set. If I end up doing this, i'll update the post after the cruise ?

I never said checking phone from time to time. I said monitoring with phone like a hawk.

But conversely even if AP isolation is enabled at each WiFI AP, it's entirely possible they have a set of firewall rules at the router sitting in the datacentre that would prevent sending traffic from one device to another. I'm sure they separate operational networks from the "customer" network but beyond that I don't know how advanced their network topology actually is on these ships.

I agree bringing my own router for both devices to connected to to accomplish this is not at all a scalable solution. The specific technical feature I was wondering in my question was is if they enabled IP isolation on their ship's network (https://www.tp-link.com/us/support/faq/2089/). If so, then my idea certainly won't work. And yeah, this would only be for naps with the kid that is in the crib and would be monitoring the phone like a hawk.

I probably should have explained why I was asking my questions ? I'm not trying to game their system/hack anything/clone mac addresses or anything like that. I wanted to put an IP camera in the room to monitor/listen for the young kid during nap time in case the older kiddo wants to use the pool so we're not trapped in the room trying to keep the older kiddo quiet during young kid nap. So I'm wanting to run something like https://play.google.com/store/apps/details?id=com.pas.webcam&hl=en on a phone sitting in the room (connected to the wifi) and something like https://play.google.com/store/apps/details?id=com.alexvas.dvr&hl=en_US on the phone in my hand to watch and listen for when he wakes up.

This is a bit of a low level question, but I'm wondering if anyone has any idea if the intranet configured on Royal Caribbean ships allows communication from one device directly to another. I'm not interested in using the internet service, I want to solely rely upon communication in the closed cruise ship network. As in if I was running a web service on a TCP port on one device if their router setup will block or route communication to that port from another device. Furthermore, are there multiple subnets on the ship? And if so, can communications route across subnets? Anyone have experience with this or know?