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@noperator
Last active June 14, 2020 01:39
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Fix broken DNS on macOS's primary interface. 60% of the time, it works every time.
#!/bin/bash
# Start trace.
set -x
# Get active primary interface.
IFACE=$(route -n get 0.0.0.0 2>/dev/null | awk '/interface: / {print $2}')
# Get networkservice name for interface.
NETSVC=$(networksetup -listnetworkserviceorder | grep "$IFACE" | cut -d ' ' -f3- | sed 's/,.*$//')
# Erase any DNS server entries, restoring entries provided by DHCP.
networksetup -setdnsservers "$NETSVC" empty
networksetup -setsearchdomains "$NETSVC" empty
# Bounce interface.
sleep 1
networksetup -setnetworkserviceenabled "$NETSVC" off
sleep 2
networksetup -setnetworkserviceenabled "$NETSVC" on
# End trace.
set +x
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