Free lab files for your own server

10 broken networks to fix, from CCNA switching to BGP and GRE, each packaged as a .unl file for EVE-NG or PNETLab with faulted startup configs, canvas notes and a walkthrough. Bring your own node images.

No server? Most of them also run in your browser as a guided lab.

terminalbash

$ scp ospf-neighbor-area-mismatch-lab.unl root@<your-server>:/opt/unetlab/labs/
# then, logged in to the server:
$ /opt/unetlab/wrappers/unl_wrapper -a fixpermissions
# then open it from the PNETLab or EVE-NG lab list

Replace <your-server> with the IP address or hostname of your EVE-NG or PNETLab server.

OSPF Neighbor Down: Area Mismatch

Two routers share a working /30 link, but their OSPF adjacency never forms. Work up from Layer 3 to find out why.

IOL L3 · 51 KBDetails

Access Control Lists: Configuring & Verifying

PC1 pings a server through R1 and gets an explicit deny back, even though the ACL looks like it permits PC1's subnet. Find out what the router actually stored.

IOL L3 · 49 KBDetails

DHCP Snooping: Trust Boundary Misconfiguration

Three switches run DHCP snooping. PC1 gets a lease, PC2 never does. Trace the trust boundary to the port dropping the server's replies.

IOL L2 · 45 KBDetails

Spanning Tree: Root Bridge Election

Three switches in a triangle, and an access switch has won the VLAN 10 root bridge election. Find out why, then move the root to the core.

vIOS-L2 · 50 KBDetails

VLANs, Trunking & Spanning Tree

A distribution switch, two access switches and four hosts in VLANs 10 and 20. PC1 can't reach PC2 or its gateway: work through the trunks, the native VLAN and spanning tree.

IOL L2 · 50 KBDetails

Static Route: Wrong Next Hop

R1's static route to a remote LAN never shows up in the routing table. Find out why, repair it, and prove the remote LAN is reachable.

vIOS · 38 KBDetails

EIGRP Neighbor Down: AS Mismatch

Two routers share a working link and ping each other, but no EIGRP neighbor ever appears, and neither router logs a single message about it. Find the setting that keeps them apart.

IOL L3 · 46 KBDetails

BGP Peering & Path Selection

Two autonomous systems, two paths to the same prefix, and R1 keeps choosing the one with the longer AS path. Walk the best-path algorithm to the attribute that overrides it.

IOL L3 · 48 KBDetails

BGP Route Reflector Scaling

Two route reflectors serve three clients in one AS, and one client is missing a route every other router has. Trace the reflected route to the loop check that drops it.

IOL L3 · 46 KBDetails

GRE VPN Endpoint Migration

A site-to-site GRE tunnel has just moved to new ISP addresses. The tunnel comes up, but the two sites still can't reach each other's services. Find what the migration missed.

IOL L3 · 50 KBDetails

What you get, and what you bring

In the file: The topology, faulted startup configs, canvas notes with the objectives, and a step-by-step walkthrough workbook.
Not in the file: Node images. Each lab page names the exact image it expects, so you can use your own licensed copy.
License: CC BY 4.0. Use them, share them, put them in your own course. Credit LabFabric with a link.