NTP: Wrong Source Interface
NTP is a foundational service for logs, certificates, and distributed operations. This lab uses a common routing-source mismatch instead of treating time sync as a one-line configuration task.
The problem
A router sends NTP requests from an unexpected interface address. The upstream NTP server permits only the management subnet, so the router remains unsynchronized despite basic IP reachability.
What you'll practice
- Read NTP association state
- Identify packet source addresses
- Configure a stable source interface
- Verify synchronization and stratum
The topology
A router has separate management and transit interfaces and reaches a centralized NTP server through the management network.
Commands to run yourself
The real diagnostic commands for this lab, copy-paste ready. Run these in the same order to reproduce the investigation on your own session.
show clock detailshow ntp associationsshow ip interface briefTopology diagram
Frequently asked
Is this aligned to CCNA practice?
Yes. It focuses on configuration, verification, and troubleshooting skills covered by the CCNA-level technology domain named on this lab.
Ready to run this lab yourself?
No setup, no image sourcing. Book a session or ask for a live demo.