how to connect R6300-connected printer from outside the router at home

[byoungro]

Hi 

AT&T installed a gateway to provide internet service to my home computers.

One of the port from the AT&T gateway is connected to R6300 router.

All other computers are connected to the gateway directly.

From R6300, I connected a computer and a printer.

I can access the printer from the computer connected to R6300.

However, I cannot see the printer from computers connected to the gateway.

It seems I have to disable the firewall in R6300 since gateway is already setting firewall from outside the home.

I don't see any appropriate explanation how to disable the firewall entirely in R6300 in the user manuall.

What is the right approach to make the R6300-attaced printer visible from outside the router?

It is not an option for me to connect the printer directly to the gateway. I have to connect the printer to the router.

Thanks.

[antinode]

> [...] R6300 [...]

   Hardware version (plain/[v1], "v2")?  Firmware version?

> One of the port from the AT&T gateway [...]

   Not a very detailed description of anything.  Does this "the AT&T
gateway" have a model number?

> [...]  is connected to R6300 router.

   Why?  If the idea was to extend your wireless-network coverage, then
you may want to configure the R6300[vX] as a wireless access point,
which would put your (unspecified) "a printer" on the same subnet as
everything else on your LAN.

   If you have an R6300v2, then visit http://netgear.com/support , put
in your (actual) model number, and look for Documentation.  Get the User
Manual.  Look for "Wireless Access Point (AP)".  If you have a
plain/[v1] R6300, then, according to its User Manual, it lacks the same
kind of one-step option for configuration as a WAP, but there's a less
convenient scheme which can be used to configure almost any wireless
router as a WAP:

      https://community.netgear.com/t5/x/x/m-p/1463500

That's written for a Netgear C6300, but the steps are about the same for
any other router (any make/model) which lacks a one-step WAP option.

> I don't see any appropriate explanation how to disable the firewall
> entirely in R6300 in the user manuall.

   I see it in the R6300v2 User Manual, but not in the plain/[v1] R6300
User Manual.

> I can access the printer from the computer connected to R6300.
> However, I cannot see the printer from computers connected to the
> gateway.

   What are the IP addresses of all these devices?  (See the
difference?)  Generally, cascading multiple routers can cause multiple
problems; configuring one router and one (or more) wireless access
point(s) avoids those problems.

> It is not an option for me to connect the printer directly to the
> gateway. I have to connect the printer to the router.

   Why?  How is the R6300 connected to your "the AT&T gateway"?  How is
your (unspecified) "a printer" connected to the R6300?