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3Router (computing) - Wikipedia– DavidPostill ♦Commented Jun 9 at 19:26
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3Gateway (telecommunications) - Wikipedia– DavidPostill ♦Commented Jun 9 at 19:27
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1If you don't want to use routers (or gateways) then you need to configure static routes, but that still requires some kind of device in-between that will (sigh) route the packets to the destination. It's unclear to me if we're talking about hardware / physical routing here (i.e. a routing device being present or not, which might not be necessary on radio networks), or software routing.– RafCommented Jun 10 at 7:46
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Also if you have two separate networks on a single router (e.g. 10.0.0.x and 192.168.1.x) then your router will usually have the option to route traffic between those so that the router can act as a 'gateway' for the different ranges. Routers will either offer to add a static route for that or not (and if not, this will keep the two networks unreachable to each other).– RafCommented Jun 10 at 7:54
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The simplest way to think about this are gateways are paths to WAN, with the modem providing the router's WAN interface the default gateway IP address for sending traffic out through WAN. What makes a router a router is that they're capable of doing NAT and have a stateful firewall, whereas devices that can route network traffic, but can't do NAT and don't have a stateful firewall are switches. Switches are "dumb", "managed", or "smart", and managed and smart switches have UIs for configuring them, offering capabilities like vLANs, vLAN tagging, and VPNs that run downstream of a router.– JW0914Commented Jun 10 at 13:07
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