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R6400v2 Router has no Internet after an outage last night
We lost internet briefly last night, possibly due to a cable modem update (TBD). Our R6260 Netgear router on this modem reconnected fine, BUT our R6400v2 which serves our primary LAN cannot connect...
Our "main" router has the "inside" IP 192.168.1.1. It is plugged into the cable modem. It serves a LAN with the address 192.168.1 with DHCP and a static IP table.
The second router is an in an adjacent building, and is plugged into one of the "main" router's LAN ports via a buried cable. It has a static IP of 192.168.1.3, so is part of that LAN, and can be access from devices connected to this wifi.
This 2nd router has an "inside" IP of 10.0.0.1, and serves a wifi of 10.0.0 with DHCP and a small IP reservation table.
We have one desktop PC plugged into one of the second router's LAN port with the static IP 10.0.0.3. From here I can log into and manage either router, which is handy.
We want the wifi's to be separate, for our two smart hubs and Google Nest, etc. It is more convenient for us this way.
Clearly this is no security within/across the two LANs, but we have never had anyone but family on our wifi networks as far as we know...! We just want the smart hubs and Google to treat each building as a separate smart home, and to have decent performance.
And I do not see how an AP would benefit us particularly, but perhaps I don't fully understand APs.
Our two router two buildings two LANs setup has been copasetic for many years. No conflicts.
There was a brief outage overnight, and I suspect the cable company (WAVE/Astound) changed/updated the modem settings. Customer reps say they don't have access to that info.
After a few tries, then a serious 30/30/30 factory reset I was able to login in as admin and setup the R6400v2.
Sadly it seems NOW the cable modem will only provide internet to one router at a time.
I have changed plugs for testing, and each router works fine alone, but when both are plugged in, only my Netgear R6260 gets the Internet, which network plug used.
And as previously stated, this configuration has been absolutely fine for many years, multiple updates, etc.
So probably not a Netgear problem, but a cable company issue...
I did have considerable trouble resetting the R6400v2: I lost our admin password, but the default password did not work until I tried the 30/30/30 trick BUT it may have all been a flaw in the nighthawk app that if you tried a bad password first you were doomed for that session ...
ptartist wrote:
Our two router two buildings two LANs setup has been copasetic for many years. No conflicts.
When you set up a network, a router will look for other devices on the network and adapt its settings accordingly. If one router sees another router on the network with Netgear's preferred default address (192.168.1.1) the new one will pick something that doesn't clash (usually 10.0.0.1). The devices can then coexist. If something odd happens, like a power outage or a modem update, that can break that cosy relationship.
By the way, cable modems rarely get updates. Your ISP certainly should be able to tell you if that happened.
I have changed plugs for testing, and each router works fine alone, but when both are plugged in, only my Netgear R6260 gets the Internet, which network plug used.
The last bit of that sentence is a bit of a puzzle. Does "which network plug used" mean "no matter which network plug used"?
Sadly it seems NOW the cable modem will only provide internet to one router at a time.
No matter, that behaviour smells like a double-NAT issue. It is hard to tell without any details about your cable modem. Maybe it is also a router. Many are.
We still don't know what firmware is on your routers, although it probably doesn't make much difference.
By the way, your suggested that there was an autoupdate to your R6400v2. This is a pretty basic, and somewhat aged, router that may predate the autoupdate feature, unless it was added in a firmware update.
Now that you are in something of a pickle – messing around with 30/30/30 is a bad idea unless you have broken firmware – you might like to set up your network in a way that does not leave you open to these problems in future.
How to fix issues with Double NAT | Answer | NETGEAR Support
There are other options, but without more information about your network, it is hard to tell.
Thank you I will look at the double nat issue link.
Our cable modem is a Netgear CM1100 and yes we have one router using 192.168.0.1 & the other using 10.0.0.1. This does not change when we are able to connect either network one at a time.
We have tried configuring a new Linksys router instead of the Netgear R6400v2 but same behavior, as rather expected. It also got the 192.168.0.1 IP, but no internet with both routers.
Thanks for suggestions, we continue to struggle.
ptartist wrote:
Our cable modem is a Netgear CM1100 and yes we have one router using 192.168.0.1 & the other using 10.0.0.1.
The usual solution is to put the second router into AP mode, wired to your main router.
We now have the router for our smaller LAN reconfigured & plugged into the main router that is plugged into the modem. The main router provides a LAN that gets more streaming & smart house traffic.
So far this seems to be fine. We don't care about security between the LANs, just separation for two smart homes we don't want to combine.
I have seen advice to use three routers to best support two LANs, but that doesn't really seem necessary.
No idea if that would result in better performance?
Advice welcome, but at least we have both LANs up and running now! Thank you for the help.