Can't see wireless router when connected via ethernet

[DT4K]

Hey All,
I have a Spectrum cable modem and an Asus wifi router.
If my laptop is connected to the modem with ethernet, I can login to the modem, but cannot connect to the wifi router.
If my laptop is connected to the wifi, I can login to both the modem and the router.
Is there a way I can setup my network so I can get to the wifi router while connected to the modem via ethernet?

 

[UsandThem]

It sounds like you have something configured incorrectly.

I have a AT&T modem / router combo, and a separate TP Link router. I can log into both of them on the PC I have them connected to (network cable).

-Wall to modem.
-Modem to router.
-Router to PC.

Since you state you have the laptop connected to the modem with Ethernet, that is likely your issue.

 

[ch33zw1z]

Yea, likely a modem/router combo, aka "gateway".

What IP do you get when connected to modem?

What IP do you get when connected to router?

 

[sdifox]

Why are you connecting your laptop to the modem instead of the router?

 

[Malogeek]

Why are you connecting your laptop to the modem instead of the router?

This. The modem will have a different network than the router as the router is providing the internal LAN.

 

[ch33zw1z]

This. The modem will have a different network than the router as the router is providing the internal LAN.

Making sure it does will be a good thing.

Edit: what the OP should do is run the Asus as a WAP and let everything be on a single network. The Asus will still have 3 ports for lan connections available, and the ports on the gateway as well.

 

[DT4K]

This. The modem will have a different network than the router as the router is providing the internal LAN.

Ok, so I've basically got 2 networks then I guess. One from the modem and one from the router.
And I guess when I'm on the router network, I can see everything and when I'm on the modem network, I can't see what's on the router network?

I should clarify.
These are my connections:
wall to modem
Modem to switch to printer
Modem to switch to NAS
Modem to desktop PC
Modem to laptop
Modem to wifi router via 20 ft ethernet through a wall into the living room (where it's more central so we get a good signal throughout the house)

So I'm connecting my laptop and desktop directly to the modem because the router is on the other side of a wall and I don't want to run more long cables through the wall.

With my laptop connected to the modem, I can scan IPs and see the modem (192.168.0.1), printer, NAS, and desktop. I can also see one more IP (192.168.0.35). I just checked the MAC for that one and it looks like it is in fact, my Asus wifi router.

If I connect to the wifi, I can login to the modem with 192.168.0.1 and I can login to the wifi router with 192.168.1.1
When connected to the modem, I can login to the modem at 192.168.0.1, but can't login to the router, using 192.168.1.1 OR 192.168.0.35

 

[sdifox]

You should have everything on the router. Modem sould be connected to the router wan port.

Right now you are exposing all the computers connected directly to the modem to the internet. Big no-no.

 

[ch33zw1z]

His modem is a gateway, it's likely a fully functioning Soho router and combination modem device.


OP, whats the model number of the "modem"

 

[DT4K]

You should have everything on the router. Modem sould be connected to the router wan port.

I get that this would make things simpler. But my wifi router is on the other side of a wall about 20 feet away from my laptop, desktop, NAS, and printer. So I don't want to run 20 ft cables through the wall for all of those connections.
I guess I could run one more long cable from the wifi router back into my office to the switch, then from the switch to the laptop, desktop, NAS, and printer.
So then I'd have.
Wall to modem
modem to router
router to switch
switch to laptop, desktop, nas and printer

Then everything would be on the LAN that is managed by the router and the only thing the modem would be connected to is the router.
But is there any real advantage to this, other than not having to switch between wired and wireless on my laptop to be able to login to both the modem and router?

 

[DT4K]

His modem is a gateway, it's likely a fully functioning Soho router and combination modem device.


OP, whats the model number of the "modem"

Sounds correct.
It's an Arris TG1672G from Spectrum.
My wifi is an Asus RT-AC88U
So yeah, I've really got 2 routers I guess.

 

[sdifox]

Combo device? Then turn the Asus into a WAP and done. right now you have a double NAT issue, that is why when you are hooked up to the arris you cannot ping the Asus router.

 

[DT4K]

Combo device? Then turn the Asus into a WAP and done. right now you have a double NAT issue, that is why when you are hooked up to the arris you cannot ping the Asus router.

Yep. I guess it's a combo modem and router. I think I'm understanding now.
So it sounds like I need to make one of my routers do all the DHCP and routing work and tell the other one to be dumb.
I guess there are 2 options right?
1. Configure the Asus as a WAP, letting the Arris do DHCP. Does this mean I need to connect the Arris to the Asus's LAN port instead of WAN port?
2. Configure the Arris to just pass through to the Asus (I think this is what Bridged mode means instead of RoutedWithNAT?) and let the Asus do the DHCP and stuff. This option would require running another cable from the Asus back through the wall to my office to the switch that connects to my printer, nas, laptop, etc.

I'm assuming the Asus router does everything better than my Arris from Spectrum.
So would option 2 be better?

 

[ch33zw1z]

It's really a matter of personal preference. Just get everything on a single network, and enjoy.

 

[sdifox]

Yep. I guess it's a combo modem and router. I think I'm understanding now.
So it sounds like I need to make one of my routers do all the DHCP and routing work and tell the other one to be dumb.
I guess there are 2 options right?
1. Configure the Asus as a WAP, letting the Arris do DHCP. Does this mean I need to connect the Arris to the Asus's LAN port instead of WAN port?
2. Configure the Arris to just pass through to the Asus (I think this is what Bridged mode means instead of RoutedWithNAT?) and let the Asus do the DHCP and stuff. This option would require running another cable from the Asus back through the wall to my office to the switch that connects to my printer, nas, laptop, etc.

I'm assuming the Asus router does everything better than my Arris from Spectrum.
So would option 2 be better?

Given your locational challenge go with option one.