Cisco Router Hardening: A Baseline for Maximum Performance & Security
A hands-on baseline for taking a Cisco IOS router from box-fresh to production-ready — secure access, sane interfaces, routing, and the hardening steps most people skip.
Cisco IOS Lab: EIGRP Route Summarization for Scalable Networks
Big routing tables are slow to converge and easy to break. In this Cisco IOS lab I use EIGRP manual summarization to collapse a sprawl of subnets into a single advertised route — shrinking the table, speeding convergence, and containing query scope, with the exact config and the show output that proves it.
Allowing ICMP Traffic Through the Cisco ASA Firewall
Why ping dies at the Cisco ASA — and how to fix it. Enabling ICMP inspection across a dual-EIGRP GNS3 lab, with the config and the verification tests.
OSPF vs EIGRP: Choosing the Right Interior Routing Protocol
Both OSPF and EIGRP can route your internal network well — but they get there very differently. Here is a practical guide to picking the right one for your topology.