My Journey with the Cisco C881-K9 Router and IPSec VPN Tunnel Configuration
Setting the Stage: The Cisco C881-K9 Router I wanted to document my experience configuring a Cisco C881-K9 router to set up an IPSec VPN tunnel—not just for myself but also for anyone who might be venturing down this path. Whether you're tackling this for the first time or just need a refresher, I hope this helps. 1. Product Code: C881-K9 2. PoE: 2 port integrated PoE 3. RAM: 256 (default) / 768 MB (Max) 4. Flash Memory: 128 MB 5. Dimensions: 32.5 cm x 24.9 cm x 4.4 cm 6. LAN Interface: 4 x 10Base-T/100Base-TX - RJ-45 7. Management Interface: 1 x console - RJ-45 8. WAN Interface: 1 x 10Base-T/100Base-TX - RJ-45 9. USB: 1 x 4 PIN USB Type A 1. Primary WAN port—FE 2. USB port 3. 4-port 10/100 Ethernet switch 4. Serial port—Console or auxiliary 5. On/Off switch 6. Reset button 7. Power connector 8. Earth ground connection 9. Kensington security slot Why the Cisco C881-K9? I’ll admit, I didn’t plan to splurge on high-end networking gear for my tests. So, when I found a used Cisco C881-...