Renew DHCP - Mac OS

renew.dhcp.sh

#!/bin/bash

# Renew DHCP on all active network services
# Works on macOS Tahoe 26.2+

echo "🔄 Renewing DHCP leases on active services..."

# List all enabled network services
services=$(networksetup -listallnetworkservices | grep -v '\*')

for service in $services; do
  # Skip irrelevant services (customize if needed)
  if [[ "$service" == "Bluetooth PAN" || "$service" == "Thunderbolt Bridge" ]]; then
    continue
  fi
  
  echo "- $service:"
  
  # Check current IP config
  info=$(networksetup -getinfo "$service" 2>/dev/null)
  if [[ $? -eq 0 && "$info" =~ "IP address" ]]; then
    # Gentle renew via scutil (no disconnect, like GUI button)
    echo "  add State:/Network/Service/$service/DHCP/RefreshConfiguration temporary" | sudo scutil
    sleep 2  # Brief pause for response
    
    # Fallback: ipconfig set DHCP (releases/renews)
    device=$(networksetup -listallhardwareports | awk -F': ' "/Hardware Port: $service/{getline; print \\$2}" | head -1)
    if [[ -n "$device" ]]; then
      sudo ipconfig set "$device" DHCP
    fi
  else
    echo "  (inactive or no DHCP)"
  fi
done

echo "✅ Done. Check System Settings > Network for new IPs."