The Subnet Overlap Nobody Saw Coming (and the 30-Second Check That Catches It)
Two offices merge. Both teams have been happily using 10.34.x.x for years. The network team stitches the sites together with a new VPN tunnel, updates the firewall, and goes home. Three days later the help desk floods with tickets: the build server answers pings but not SSH, a printer works on Tuesdays, and one department swears the CRM "loads eventually, if you refresh five times." Nothing is on fire. Everything is intermittent.
This is an AI-generated summary. ShortSingh links to the original source for the complete article.
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