Simple definition
A default gateway is usually a router that forwards traffic from a local network to other networks, including the Internet.
Technical definition
A default gateway is the next-hop IP address used when the routing table has no more specific route to the destination. On a computer, it normally points to a router interface in the local subnet.
What is the default gateway used for?
It forwards traffic to the Internet, another VLAN or a routed remote network.
Concrete example.
A PC at 192.168.10.25 sends traffic destined for a different network to its default gateway at 192.168.10.1.
Common problems
- Incorrect default gateway address
- Gateway not reachable on the local subnet
- Missing default route
- Router or gateway unavailable
Related terms
The exact gateway configuration depends on the network topology, routing policies and device platform.