network
Network
Starlink as Last-Resort Gateway
Implementing Starlink as a last-resort internet gateway for disaster recovery when all primary WAN links are compromised. Describes the L2/L3 topology and traffic flows designed to support command-center users during a crisis.
Modernizing Telephony System - Toshiba Strata CTX28 to Servpac Yealink
Replacing an end-of-life Toshiba Strata CTX28 phone system with Servpac-managed VoIP and Yealink IP phones. Covers the autoattendant call-flow, integrating the phones with Ubiquiti voice VLANs, and the operational benefits gained.
Unable to Access MS Office Forms
Wired users in one building could not reach forms.office.com despite passing L1, L2, and firewall checks. Comparing distribution stacks against a working building pointed to the switch itself, and an upgrade and reboot of the affected distribution stack restored connectivity.
C2960X DACL Limits Breaking Authorization
Wired users in a specific ISE-profiled group failed dot1x authorization only on Catalyst 2960X switches. The root cause was the 2960X's downloadable ACL line limit, fixed with a location-specific, trimmed DACL.
DMVPN Tunnel Goes Down at Midnight
A DMVPN hub-spoke network dropped every night around midnight. Correlating logs revealed a single spoke's interface flapping, flooding EIGRP advertisements over the low-throughput tunnel, and the fix was disabling the port and applying no autostate to the offending SVI.