Devices behind switch cannot see each other or other devices on the network.

larzjudith · May 20, 2018

I have a modem with a router(Nighthawk R7000) and a switch(SG110-16) connected to it. The router is serving up 2.4G and 5G wireless to the house. The switch is serving a wired network.

My problem is that My PC is wired to the switch and has an internet connection but it cannot see anything else connected to the switch, or anything connected wirelessly to the Nighthawk.

I don’t understand how I need to configure my network to keep everything on the same network.

Can someone help me with this? I just keep living this way, but would like to have a LAN that works.

kanewolf · May 20, 2018

If your "modem" has multiple wired ports, it is not a modem, but a modem/router. You then want to setup your R7000 as a WIFI access point and not a router. If you have your "modem" connected to the WAN port on the R7000 then it is just like your computer (connected to the "modem") is the internet and the R7000 is shielding everything.

Here is how to configure your R7000 as an access point -- https://kb.netgear.com/24104/How-do-I-change-my-Nighthawk-router-to-AP-mode-after-I-ve-already-run-setup

larzjudith · May 21, 2018

kanewolf :

Thank you for your response kanewolf,

I spent about 3 hours trying to get things to work with the R7000 as an AP. With this configuration I was only able to have one device connected via wifi at a time. The modem/router has a "LAN" and "Computer Icon" label on it. I'm not quite sure what the computer icon means. Perhaps the one device limitation is due to the modem/router not having DHCP on it? I can't seem to get logged into the modem/router which is a pain.

Right now I have the R7000 in "router mode" with the switch behind it. In theory I should be able to let the R7000 assign IP addresses to all wifi devices and devices wired to the switch. Is this correct? If DHCP is in fact on in the modem/router I will run into a bunch of address conflicts right? I also don't know how limiting my network speed will be with this configuration.

Thanks!

failboat · May 21, 2018

You are having issues with cascaded switches.

If you have 2 DHCP servers dishing out conflicting ips then mac tables will be all over the place.
This would explain why the internet works, but LAN doesn't. If you have another router turned AP and you left the DHCP on. It could be the culprit. Unplug the r7000 from the switch and see if hosts ip drop.

It's possible, but not very likely one of them has a full mac table. you could try flushing them.
Make sure both support STP. Which is designed to help loopback issues.

larzjudith · May 21, 2018

failboat :

Thanks failboat!

I thought 2 DHCP servers was my issue, but I just talked with my ISP and found out their device (Hitron CODA-45) is a modem only with no DHCP server on it.

My theory now is that my initial configuration which had the switch and router plugged into the router worked for the wifi network, but anything plugged into the switch only had one address to work with. How the modem was working with a device(s) on one port, and a router with several devices on the other port is confusing to me. Is there some kind of addressing going on between ports?

My new configuration makes more sense to me in that I now have Modem > Router > Switch as the router can do all the address assigning and the modem is just providing the internet signal. The hiccups initially were probably due to devices leasing ip addresses from the old network, and it was conflicting with the new assignment.

Hopefully my thoughts are at least somewhat correct. If so, I feel like I might finally be making some headway on networking configuration.

kanewolf · May 21, 2018

OK, if you really only have have a modem, then you need your switch on the back side of the R7000 so that the R7000 is the one and only LAN DHCP server.

The data sheet for the CODA-45 -- http://www.hitron-americas.com/wp-content/uploads/2016/09/CODA-45_datasheet_20170915.pdf sheds some light on the two ethernet ports. They can be bonded as a single 2GE link.

Modem -> R7000 (in router mode) -> switch -> devices should take care of your problems.

failboat · May 21, 2018

Does everything work now with modem -> WAN port r7000 -> LAN -> LAN switch

If you changed a lot of stuff on the r7000 you might want to factory reset if you can't figure out how to get it back to defaults.

larzjudith · May 21, 2018

kanewolf :

What does a bonded link get me? Another data stream?

failboat :

I have been working off the network all day with about 10 wifi devices and 2 wired behind the switch and everything seems good so far. I haven't factory reset the r7000 but I'll keep that in mind if things get flaky again.

I can't thank you two enough for answering my questions. This has been something I have tried to do several times in the last probably 7 years and I always have to fall back to a functional setup that doesn't let me do everything I want to do. Previous research has always turned up with similar problems, but something in my configuration was always a bit off. I finally feel like I have an understanding of how and why this stuff works this way.

kanewolf · May 21, 2018

No a bonded link does not provide a second data stream. It is a way to allow that modem to provide greater than 1Gbit connectivity (if your provider were to offer greater than 1Gbit). Unless you are paying for greater than 1Gbit WAN bandwidth you should ignore that capability.

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