Ignore DHCP-supplied DNS search domains on Ubuntu#196
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The host's vmnet DHCP server relays the Mac's own resolver search domains (e.g. stale *.cmu.edu entries) into the Tart Linux VM. Ubuntu appends them to public names like github.com, and if any points at an unreachable resolver, every lookup — including `git pull` — stalls for ten seconds. Document a netplan drop-in that disables use of those domains, complementing the existing /etc/hosts local-hostname fix. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FBtLdhjCVy3hFe1ofzUAgv
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