FTD Access Control Policy in FDM: Rule Order and packet-tracer
Fix an FDM access rule blocked by rule order. Follow real FTD packet-tracer, system support trace and acl-drop evidence, then verify recovery.
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↗ 02Switching & VLANsBuild and troubleshoot Layer 2 networks.
↗ 03RoutingUnderstand forwarding decisions and paths.
↗ 04Security & accessExplore controls, authentication, and firewalls.
↗ 05WirelessFrom WLAN fundamentals to controller operations.
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FTDv 10 in Containerlab: Bootstrap Local FDM Without FMC
Bootstrap local FDM on FTDv 10 in Containerlab, deploy policy through the REST API, and fix unreachable management while verifying traffic still passes.
ASA tcp-not-syn: Asymmetric Routing and TCP State Bypass
Reproduce ASA tcp-not-syn and syslog 106015 with asymmetric routing, then verify a routing repair and scoped TCP state bypass with the return ACL.
ASAv in Containerlab: Boot, Unlicensed Limits, and the First Ping
Follow a captured Cisco ASAv boot in Containerlab, diagnose no-route ASP drops, fix the default route, and verify ping and HTTP under the 100 Kbps limit.
Suricata on a SPAN Port: Why the Wrong Mirror Direction Means No Alerts
Suricata shows no alerts during a port scan? Trace a SPAN direction fault through missing SYNs and EVE logs, then fix the mirror and verify recovery.
Cisco Images in Containerlab: IOL, vIOS, ASAv, FTDv, N9Kv and 9800
Choose Cisco Containerlab images by lab: IOL, IOSv, ASAv, FTDv, N9Kv and C9800. Compare local tags, RAM, interfaces and verified limits.
DHCP Starvation and Rogue DHCP Server: A Snooping Lab
Exhaust a 12-address DHCP pool, observe a rogue gateway, fix an untrusted snooping uplink, and verify bindings, burst isolation, and rogue OFFER drops.
ICMP Ping Fails? Troubleshooting Lab: Timeouts, TTL and MTU
Follow ICMP ping troubleshooting steps through seven captured faults: timeouts, unreachables, ACLs, return routes, TTL loops, MTU and host firewalls.
STP Root Port Election Worked Example: Cost, Neighbor BID, and Port ID
Calculate root ports on six switches using cost, neighbor BID, and sender port ID. Check real outputs, then change one cost to move SW4’s root port.
Cisco Port Security vs MAC Flooding: Limit Learning, Fix Shutdowns
Test Cisco port security against MAC flooding: 17,991 learned entries, a three-MAC protected table, and a phone-plus-PC shutdown fixed with maximum 2.
Cisco IPsec Phase 1 Up, Phase 2 Down: Five IOL Lab Tests
Phase 1 up, Phase 2 down on Cisco? Diagnose four IOL VPN outages with real debug, NAT and ESP evidence, plus a lifetime mismatch that kept working.
802.1X Dynamic VLAN Assignment Not Working: FreeRADIUS Lab
Trace a FreeRADIUS VLAN typo from Access-Accept to an unauthorized Cisco port. Compare sessions, syslog, pings, and Zeek, then verify the fix.