Note: I originally posted this on network engineering as I thought that would be the appropriate place since my intention is to gain insight on whether or not the statement given to me holds water from a technical standpoint (and if so why) but I was advised that it should be posted here instead. So uh, now I'm here I guess. (new sorry)
I have minor networking experience and I'm not posting this looking for support to a problem, but rather am just wondering if there's validity to something I was told by a Verizon tech and if so why it's happening.
Here's the important info: I am a Verizon Fios customer. For the last year or so I've had a second (TP-Link) router connected to the Fios router. The TP-Link is acting as an access point; it is in access point mode and is not doing anything related to routing. I added this access point because I noticed Verizon's wifi was incredibly unstable (and just congested from other devices in the house) which didn't work well for some remote desktop gaming related and wireless VR stuff. All devices that connect to the access point are still part of the original router's subnet and appear and act as if they were connected to the Fios router itself. They aren't behind a NAT as far as I can tell. The access point is just behaving as a switch. The access point has DHCP server options however I have them disabled since it's not necessary as the Fios router is handling DHCP.
Recently, as in within the last month or two, my internet has been going down. At first it was random outages that would last maybe a few minutes, and now they last multiple hours (even all day as of yesterday.) We eliminated the Fios router as being the issue as it was replaced and it seems like the problem is happening beyond the router starting at the WAN cable. The first tech that came out replaced the ONT box outside the house however there was no effect. Today, a tech came out and had a look at some stuff and replaced the WAN cable itself (the one between the ONT box and the router) however when he did so he mentioned that the issue is probably being caused by the second access point. He said something along the lines of a double NAT situation causing some sort of conflict that eventually ends up crashing the ONT box.
Now, my understanding is that even with a double NAT situation this shouldn't happen right? Wouldn't the second NAT just stop at the Fios router and never be able to do anything that would affect the WAN connection/ONT box anyway? As of right now the second access point has been disconnected all day just to see if the connection goes down without it and it hasn't gone down so far but I don't know if that's because of the access point or if it's because he replaced the cable or whatever else he did.
At first I was thinking that it just sounds like a stupid reason being thrown out because they couldn't think of anything else and were looking for a scapegoat, but apparently someone online (I don't have the link) had a similar issue/situation. Is this maybe something stupid on Verizon's end or is this a deeper issue that affects more than just Verizon boxes? Has anyone encountered anything similar with Verizon or some other situation?
If this is exclusive to Verizon, are there any Verizon techs who could maybe shed light onto why?
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