OSPF and NAT multiarea
Simulating a redundant, multi-area enterprise network routing structure. Configured secure NAT borders, routing filters, and OSPF area transitions using GNS3 emulator.
Network Topology
Network Routes & Connections
CLI Command Simulation
Select a scenario to trigger and view simulated Cisco IOS CLI outputs.
Network & Routing Principles
Multi-area Routing
Configured OSPF routing protocols separating Area 1 and Area 2, using Area Border Routers (ABR) to summarize route advertisements.
Network Address Translation
Implemented static and dynamic NAT (PAT) translating internal private addresses to access outside public ISP zones.
Network Emulation
Designed, wired, and simulated Cisco routers, switches, and hosts using virtualized GNS3 environments.
Get Cisco Configurations
Clone the repository to access the GNS3 topology files and startup configurations.
# Clone GNS3 network topology files
git clone https://github.com/everleepham/ospf_multiarea.gitEngineering Challenges & Design Decisions
Route Loop Prevention
Problem
Connecting Area 1 and Area 2 directly without passing through Backbone Area 0 caused infinite routing loops.
Engineering Solution
Restructured the physical topology to route all transit traffic through Area 0, and configured virtual links on Cisco routers to bridge disconnected areas.
Key Achievements & Metrics
- Achieved full end-to-end network reachability across different routing domains.
- Secured internal IP addresses using Port Address Translation (PAT).
- Gained deep hands-on expertise in Cisco IOS commands and GNS3 network mapping.