DHCP configuration options

A DHCP (Dynamic Host Configuration Protocol) server is essentially a network service that automatically assigns IP addresses and related network configuration to devices on your network. When a device joins your network, instead of you manually configuring its IP address, subnet mask, DNS servers, and default gateway, the DHCP server handles this automatically.

Pi-hole can function as a DHCP server, providing these key features:

1. IP address assignment: It can automatically assign IP addresses to devices on your network from a pool you define
2. DNS configuration: It ensures all devices use Pi-hole as their DNS server automatically
3. Static IP assignments: You can reserve specific IP addresses for certain devices
4. Lease management: It handles how long devices can keep their assigned IP addresses

You might want to use Pi-hole's DHCP server when:

• You want to ensure all devices use Pi-hole for DNS without configuring each one manually
• Your router's DHCP server doesn't allow you to specify custom DNS servers
• You want better visibility into which devices are on your network (Pi-hole provides a nice interface for this)
• You want more control over IP assignments and DHCP options

However, there are several important considerations to be careful about:

1. Only run ONE DHCP server on your network. Before enabling Pi-hole's DHCP server, you must disable your router's DHCP server. Having multiple DHCP servers can cause serious network issues.

2. Before switching:

   • Document your current DHCP settings (IP range, subnet, etc.)
   • Note any existing static IP assignments
   • Have a backup plan to restore router DHCP if needed

3. Ensure Pi-hole has a static IP address itself before enabling its DHCP server

4. Consider reliability - if your Pi-hole device goes down, new devices won't be able to join your network, and existing devices might lose connectivity when their DHCP leases expire