Networking Help
Networking Help
I just installed a mesh WiFi network in addition to my ISP-provided router that could barely reach upstairs. I had some locally hosted services set up as per Mediabox. All containers were set up with my machine IP(?) 192.xxx.x.xx and were working great inside my network, which is all I wanted to do while I'm learning. I noticed today that if I connect via the other, mesh WiFi network that this IP can't be accessed, despite it being the same machine. What's going on?
All advice much appreciated as I am (obviously) a self hosting novice!
Hello,
From your post and other comments it sounds like you're under double NAT when connected to the deco access points.
In order to solve this, go to the deco app. Go to more -> advanced -> operation mode and change it to access point mode.
This will stop the main deco acting as a router and will hand over DNS, DHCP, routing and other such things to the main router, thus keeping your docker containers and devices connected to the deco's on the same network
Hope that helps!
Hello! I for sure have a double NAT problem - after writing this post I went to connect my xbox to the new mesh WiFi and it told me this was the issue, but I had no idea how to fix it until all of the great advice on here. Your instructions were spot on and now everything is working as expected! :)
Do you have any thoughts on if I should stop the ISP router from broadcasting its 2.4 and 5GHz networks now? They seem redundant, but I saw that turning the router into modem mode will prevent me from using all it's Ethernet ports :/
Hello again,
Ah I did not realise your ISP router had a modem mode, this gives us another avenue to approach the problem, as far as I see it there are three options
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Have a look at your ISP routers settings there may be a way to disable just the wireless radios without putting it in modem mode, depends on the router though and without the model I am unsure if its doable on your router. This would mean you still use your ISP router for routing, DHCP, DNS etc. but the WiFi connection comes from the decos.
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Depending on your model of deco you probably have a spare ethernet port or two on the main deco (that's plugged into the ISP router) if that's the case you could buy a cheap unmanaged switch, something along the lines of this: https://amzn.eu/d/dJ3tq1P this will plug into one of the spare ethernet ports on the Deco and act as an 'extender' so you can plug multiple devices into the switch and then the switch into the deco. Then you would reverse what you did on the first post, by gong to the deco app More -> Advanced -> operation mode and selecting WiFi router, after this go to your ISP router unplug all the ethernet devices apart from the deco (and make sure the deco is in port 1) and enable modem mode. This means your ISP router is now a dumb modem and all routing, DHCP, DNS etc is handled by the deco (so if you ever want to port forward it will all be handled by the decos via the deco app and you no longer use your ISP routers admin page). This will still have all your devices on one flat network as it is now and will avoid the double NAT issue.
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You do nothing, as long as your not noticing WiFi degradation when your near the ISP router in theory it should cause no issues. If you do choose this option I recommend you go to on the deco app More -> Network Optimisation and run through that, this will make the decos try and find a wifi channel that is not busy, meaning it will in theory put your decos on a different chanel to the ISP router and attempt to avoid clashing.
Let me know if you have anymore questions but if you not, hope that helps!
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I'm not him, but I do have an opinion. :)
5GHz is definitely preferred, however, many smart home devices (like smartbulbs for example) often can only use a 2.4GHz connection. I would just check your devices and see what network they are connected to, and if any of them are on the 2.4GHz band it might be for a reason. If everything you use already connects to your 5GHz network, then you should be able to just disable 2.4GHz in your router configs. Experiences will vary based on firmware, but that's the practical gist of it.
You don't lose anything by disabling 2.4 if you aren't using it.
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Yo! Based on some of the other answers this seems spot on. I guess the problem is that I was kinda running two routers, when really I wanted the mesh system to act as a series of access points for the original network. I don't know - but I can confirm that turning the mesh system into 'Access Point Mode' fixed this issue for me
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Can you give us some more details about how your network, mesh and machines are setup?
Are you trying to access the containers from the machine they’re running on, or from a different machine?
Is the container host moving between different AP’s, or is it on ethernet?
What IP address do you get when connected to the different access points? Does it change?
Are your access points in Access Point only mode, or are they acting as routers? What brand/model?
How are the mesh access points connected - powerline, ethernet, wifi meshing?
Sure thing! I'll answer everything as best I can.
The machine is a single laptop running Mint. All the docker containers are being served from this machine, and during this testing I was trying to access them all from that same machine. I observed the containers were up and running properly with docker stats cmd and I saw they were accessible over the original IP when using the ISP WiFi.
The access points are TP Link Deco, it's 3 units, the first of which is connected via ethernet to my ISP provided router (Virgin Media Superhub). I believe they are WiFi meshing. I can't tell too much more about how they work 'under the hood' as the setup was very... 'consumer friendly' and didn't cover much technical detail
When I connect to this network and run ifconfig it looks like the IP changes in the last few digits. I thought if I used that IP with appropriate ports I might be able to view my servers, but that was not the case.
If you’re starting the mediabox setup on the isp network, it’s doing local natting with iptables, based on the IP that it resolves from the hostname. Probably would need to shut down and re-up to walk between the deco’s and the isp wifi domains.
I agree with the other comments, looks like you might be in a double NAT scenario - fortunately for you, I think I know how to fix it, seeing as we’re both running deco’s!
You want to go into the smartphone app, go to ‘More’ at the bottom right, (as opposed to ‘Network’), Advanced > Operation Mode > Access point.
Be aware this will cause a disruption, and anything connected to them will need to be reconnected so it gets dhcp/ip addressing from the isp router rather than the deco.
The other alternative is, if they’re already in AP mode, it might be recognizing the deco SSID as a separate network to your ISP’s router, and randomizing your mac address (for anonymity across airports and hotels and such). Then, with your original mac address holding the first IP in lease, your ‘new’ mac address gets a different one. Check your mac with ip link too when connected to the two different networks, and see if you can find an option to set it manually for both networks, or just use your default one for those networks.
I’d love to hear how you get on, I’ve been putting off building this exact solution (mediabox) from scratch, had no idea there was a project set up to run it all
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:
Fewer Letters More Letters AP WiFi Access Point DNS Domain Name Service/System IP Internet Protocol NAT Network Address Translation
4 acronyms in this thread; the most compressed thread commented on today has 7 acronyms.
[Thread #118 for this sub, first seen 8th Sep 2023, 06:35] [FAQ] [Full list] [Contact] [Source code]
Does this setup have you running two separate routers? AFAIK this is an issue since they can assign conflicting IPs. Typically when using your own router combined with an ISP modem/router combo, you're supposed to set the ISP device into pass-through mode so that it isn't doing anything but forwarding the traffic to your personal router.
When you connect to the other mesh networks, are you getting an IP address in a different subnet?