How to Configure Default Route on Cisco Router | Packet Tracer Step-by-Step Lab.
In this Cisco Packet Tracer tutorial, I'll show you how to configure a default route (gateway of last resort) on Cisco routers step by step. We'll build a complete lab from scratch—including adding HWIC-2T serial modules, configuring GigabitEthernet and Serial interfaces, saving configs with do write, and verifying connectivity with show ip interface brief, show ip route, and ping.
Whether you're studying for your CCNA or just getting started with networking, this beginner-friendly guide covers everything you need to know about static default routes.
🔧 What you'll learn:
How to add HWIC-2T serial modules to 1841 routers
Connecting routers via Serial DCE cable (identifying DCE vs DTE)
Configuring GigabitEthernet 0/1 for LAN connectivity
Full CLI configuration – IP address, no shutdown, clock rate
Saving your configuration with do write
Configuring default route using ip route 0.0.0.0 0.0.0.0
Verification with show ip interface brief, show ip route, and ping