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Default Routes - Routing Fundamentals | Network Design | Repovive

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Network Design26 sections · 911 units44h total

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Default Routes

Gateway of last resort

A default route matches any destination not covered by more specific routes. It's your "gateway of last resort" when no other route applies.

The default route is written as $0.0.0.0/0$ . A prefix length of $0$ means no bits need to match. Any destination IP will match this route.

S*   0.0.0.0/0 [1/0] via 203.0.113.1

The asterisk (*) indicates this is the gateway of last resort. Without a default route, your router drops packets destined for unknown networks. Most networks configure a default route pointing toward the internet or a core router that has more complete routing information.