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To configure a router to use DHCP, set the WAN/Internet connection to Dynamic IP or Automatic IP when the ISP supplies an address automatically, and enable the LAN DHCP server when the router should assign addresses to home devices. Most ordinary home networks need both settings, but access points and business networks may not.
Key takeaways
- WAN DHCP makes the router obtain its Internet-facing address from an ISP, modem, or upstream router.
- LAN DHCP makes the router give private IP addresses, gateways, and DNS information to computers, phones, printers, and other local devices.
- A simple home network can use a LAN address such as
192.168.50.1with a DHCP pool such as192.168.50.100through192.168.50.200. - A second router used as an access point should normally not run a second DHCP server on the same LAN.
- A client showing a normal IPv4 address in the wrong subnet, an incorrect gateway, or a
169.254.x.xaddress usually indicates a DHCP, subnet, or connectivity problem.
DHCP means Dynamic Host Configuration Protocol. DHCP automatically supplies network settings such as an IP address, subnet mask, default gateway, DNS server, and lease duration. DHCP is a network-configuration service, not a type of Wi-Fi; a device can use DHCP over Wi-Fi or Ethernet.
Which DHCP setting do you need?
The phrase “use DHCP” describes two separate router functions. Choose the setting that matches the problem before changing anything.
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|---|---|---|
| Let the router receive an address from an ISP, modem, or upstream router | WAN/Internet DHCP, Dynamic IP, Automatic IP | Internet, WAN, or Internet Connection Type |
| Let phones, computers, televisions, and printers receive addresses automatically | LAN DHCP server | LAN, Local Network, or DHCP Server |
| Use a router as an access point on an existing network | Usually disable the secondary DHCP server | Access Point, Bridge, or LAN settings |
| Give a downstream router an address from the main router | DHCP on the downstream router’s WAN interface | Internet or WAN settings |
| Use a business DHCP server | Disable consumer-router DHCP or configure DHCP relay as designed | LAN, VLAN, or DHCP settings |
| Keep a printer or camera at a predictable address | DHCP reservation | Address Reservation, Static Lease, or DHCP Reservation |
What should you prepare before configuring DHCP?
Have the following ready:
- The router administrator username and password.
- The router’s management address or official vendor setup URL. Addresses such as
192.168.0.1,192.168.1.1, and192.168.50.1are examples, not universal defaults. - An Ethernet cable if changing network settings could interrupt Wi-Fi.
- Your ISP connection type, if known.
- The existing LAN subnet if the router is being installed behind another router.
- The answer to one important question: does another router, firewall, server, or access point already provide DHCP?
Use a wired connection when possible. Do not make major LAN changes over an unreliable wireless connection, because changing the router’s address can immediately invalidate the old management address.
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How do you configure the router’s WAN side to use DHCP?
Configure the WAN/Internet side for DHCP when the ISP, modem, ONT, or upstream router automatically supplies the router with an IP address. Router interfaces may label this option Dynamic IP, DHCP, Automatic IP, or Obtain an IP address automatically. TP-Link’s Dynamic IP instructions describe this option for an ISP that provides DHCP service.
- Connect the modem or ONT to the router’s WAN or Internet port, not an ordinary LAN port.
- Connect a computer or phone to the router.
- Open the router’s web interface or mobile app and sign in as administrator.
- Open Internet, WAN, or Internet Connection Type.
- Select Dynamic IP, DHCP, or Automatic IP.
- Leave optional WAN fields unchanged unless the ISP gave you specific values.
- Save or apply the change.
- Open the router’s status page and check that the WAN address, gateway, and DNS values are populated.
Do not select Dynamic IP merely because it is the easiest option. Some ISPs require PPPoE credentials, a static IP configuration, VLAN tagging, MAC registration, or another provider-specific setting. DHCP is correct only when the upstream network supplies the address automatically.
If a different router has just been connected to a modem or ONT, the modem or ONT may need to be restarted. Some provider equipment remembers the previous router’s hardware address, but this behavior depends on the ISP and equipment.
How do you enable the router’s LAN DHCP server?
Enable the LAN DHCP server when this router is responsible for assigning addresses to devices on the home network. Common paths include LAN > DHCP Server, Network > LAN > DHCP, Advanced > Network > DHCP Server, and Local Network > DHCP. ASUS’s DHCP-server guidance explains that the router can assign client IP addresses and provide DNS-server and default-gateway information.
- Open the router’s administration page.
- Open LAN, Local Network, or DHCP Server.
- Enable DHCP Server if this router should serve the local network.
- Confirm the router’s LAN IP address and subnet mask.
- Choose a DHCP start and end address in the same subnet.
- Keep the router’s own LAN address outside the dynamic pool.
- Leave the default gateway as the router’s LAN address.
- Leave DNS on automatic unless you have a deliberate reason to use another DNS service.
- Save the settings and allow the router to restart if requested.
TP-Link’s LAN configuration guidance states that the DHCP pool must be in the same subnet as the router’s LAN address.
What is a safe DHCP address pool?
A practical example for a small home network is:
| Setting | Example | Why it matters |
|---|---|---|
| Router LAN IP | 192.168.50.1 |
The router’s local gateway and management address |
| Subnet mask | 255.255.255.0 |
Defines the local IPv4 subnet |
| DHCP start | 192.168.50.100 |
First address offered dynamically |
| DHCP end | 192.168.50.200 |
Last address offered dynamically |
| Default gateway | 192.168.50.1 |
Where clients send traffic outside the local network |
| DNS | Automatic | Uses the router or upstream DNS configuration unless deliberately overridden |
The pool does not have to use these exact addresses. The pool must match the router’s LAN subnet, and the pool must not hand out the router’s own LAN address. Avoid manually assigning static addresses inside the active DHCP pool unless the router is designed to prevent conflicts.
For example, ASUS documents a pool from 192.168.50.2 through 192.168.50.254 for a router at 192.168.50.1. A smaller pool such as 192.168.50.100 through 192.168.50.200 leaves room for deliberately assigned infrastructure addresses.
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Lease time is how long a client may use a dynamically assigned address before renewing it. A normal home network can usually keep the manufacturer’s default. Shorter leases can help networks with many temporary visitors; longer leases reduce renewal activity for stable networks.
Lease controls are model-specific. For example, the TP-Link TL-WR902AC v3 guide documents a configurable range of 1 to 2,880 minutes and a 120-minute default for that model. Those values are not universal DHCP requirements.
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Should you enter DNS servers manually?
Most users should leave DNS set to automatic. DHCP can distribute DNS information supplied by the ISP or upstream router, and manually entering a public DNS server is not required for DHCP to work.
Manual DNS can be a deliberate troubleshooting, filtering, privacy, parental-control, or policy choice. Changing DNS can also break local hostnames, corporate filtering, split-horizon DNS, or ISP-specific services. TP-Link lists primary and secondary DNS as optional DHCP-server fields.
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How do you set computers and phones to obtain addresses automatically?
The router’s DHCP server works only when clients are configured to accept automatic network settings. Phones and tablets normally use automatic addressing by default, but printers, cameras, and older IoT devices may retain manual settings.
| Device | Required setting |
|---|---|
| Windows | Set IPv4 to Obtain an IP address automatically and DNS to Obtain DNS server address automatically. |
| macOS | Set TCP/IP configuration to Using DHCP. |
| iPhone, iPad, Android phone, or tablet | Use the Wi-Fi network’s automatic IP setting; exact labels vary by operating-system release and manufacturer. |
| Printer, camera, television, or IoT device | Check the device’s network settings separately and remove a manually configured IP if automatic addressing is intended. |
TP-Link notes that computers must be configured to obtain an IP address automatically for the router’s DHCP server to assign settings as intended.
After changing the client setting, disconnect and reconnect to Wi-Fi or Ethernet. You can also renew the lease manually.
Useful client commands
On Windows, open Command Prompt and run:
ipconfig /all
ipconfig /release
ipconfig /renew
nslookup example.com
ping <router-LAN-IP>On macOS or Linux, useful examples include:
ip addr
ip route
networksetup -getinfo Wi-Fi
sudo ipconfig set en0 DHCPThe macOS interface may not be named en0, and Linux network commands vary by distribution and network manager. Treat these as diagnostic examples rather than universal commands.
How do you verify that DHCP is working?
Check the router first, then check one client. A working home setup should show a valid WAN configuration, a client address in the expected LAN subnet, the router as gateway, and successful DNS and Internet tests.
Router verification checklist
- The WAN status page shows a usable address rather than
0.0.0.0. - The WAN gateway and DNS values are present where the ISP or upstream network supplies them.
- The LAN address is the intended local gateway.
- The LAN DHCP server is enabled if this router serves the network.
- The DHCP client or lease list shows connected devices.
- Assigned client addresses fall within the configured pool.
TP-Link’s WAN troubleshooting guidance identifies the Internet IP address as an important first check; a WAN address of 0.0.0.0 means the router did not receive a usable Internet-side address.
Client verification checklist
- The device has an IP address in the expected subnet, such as
192.168.50.xfor the example network. - The subnet mask matches the router’s LAN configuration.
- The default gateway is the router’s LAN address, such as
192.168.50.1. - A usable DNS server is listed.
- The client does not have a
169.254.x.xself-assigned IPv4 address in a normal home IPv4 setup. - The client can reach the router’s LAN address.
- DNS resolution works and the client can reach the Internet.
What changes when a second router is connected?
A second router can either create a separate routed network or act as an access point. The correct DHCP arrangement depends on that choice.
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When the second router remains a router
The second router can use DHCP on its WAN interface to receive an address from the main router. The second router’s LAN subnet must be different from the main router’s LAN subnet, and its own LAN DHCP server can remain enabled for devices behind it.
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|---|---|
| Main router LAN | 192.168.1.1/24 |
| Second router WAN | DHCP lease from the main router |
| Second router LAN | 192.168.50.1/24 |
| Second router DHCP pool | 192.168.50.100–192.168.50.200 |
This arrangement creates double NAT. Web browsing may work normally, but inbound connections, port forwarding, gaming, VPNs, remote access, and device discovery can become more complicated.
When the second router should be an access point
If the goal is simply better Wi-Fi coverage on one home network, use the manufacturer’s Access Point, Bridge, or equivalent mode. The main router should remain the only DHCP server for that LAN. If the device’s mode does not disable DHCP automatically, disable the secondary DHCP server manually.
Give the access point a reachable management address, preferably through a documented DHCP reservation or an address outside the main DHCP pool. TP-Link’s access-point documentation distinguishes access-point DHCP behavior and explains that the device may receive its management address through DHCP.
Two DHCP servers on the same broadcast network can offer different gateways, DNS values, or subnets. Cisco warns that multiple DHCP servers on the same network can conflict and create unpredictable results. Cisco’s DHCP documentation also explains same-network operation and relay behavior.
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How should you configure DHCP with a business or dedicated DHCP server?
Do not automatically enable the consumer router’s DHCP server when a business server, firewall, or managed network platform already provides DHCP. Determine which device owns the LAN gateway, which device supplies DHCP, whether VLANs are involved, and whether DHCP relay is required.
DHCP broadcasts do not normally cross a router. When clients and the DHCP server are on different routed networks, the network generally needs a DHCP relay or an equivalent design. A dedicated DHCP service is appropriate for multiple VLANs, centralized DNS and DHCP policies, failover, or enterprise administration, but it adds complexity that most homes do not need.
What are the most common DHCP problems?
The router page no longer opens
The router’s management address may have changed, the client may have received a lease from another DHCP server, or the device may have entered access-point or bridge mode.
- Check the client’s current default gateway.
- Enter that gateway address in the browser.
- Disconnect from VPN software temporarily.
- Renew the client’s DHCP lease.
- Try an Ethernet connection.
- Check the router label and official manual for the current management address.
- Factory-reset the router only as a last resort, because resetting erases the configuration.
TP-Link explains that changing the LAN IP can require reconnecting the computer and that the new LAN IP becomes the router’s management address.
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Clients receive no IP address
Check that the LAN DHCP server is enabled, the address pool is not exhausted, the client uses automatic addressing, and the client is connected to the intended SSID, VLAN, or LAN. Also check for a second DHCP server, guest-network isolation, a faulty cable, or a pool that does not match the LAN subnet.
If DHCP is disabled, another DHCP server must exist or every client must be configured manually. NETGEAR explains that disabling a router’s DHCP service requires another DHCP service or manual client configuration.
The router has a LAN address but no Internet
- Confirm that the modem or ONT is connected to the router’s WAN/Internet port.
- Confirm that the WAN type is Dynamic IP/DHCP only if the ISP requires automatic addressing.
- Check whether the router has a valid WAN address rather than
0.0.0.0. - Check that the modem or ONT is online.
- Verify whether the ISP requires PPPoE, a static address, VLAN tagging, or MAC registration.
- Restart the modem or ONT first, then restart the router.
- Check for manually entered DNS values that are incorrect for the network.
A local LAN lease does not prove that the router has a working Internet connection. WAN addressing, routing, the ISP link, and DNS must be checked separately.
The client shows a 169.254.x.x address
A 169.254.x.x IPv4 address generally means the client did not obtain a DHCP lease and assigned itself a local address. Investigate the client’s Wi-Fi or Ethernet connection, the DHCP server, the VLAN or SSID, the cable, and the available address pool.
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Symptoms include intermittent connectivity, different devices receiving different gateways, devices appearing on unexpected subnets, inconsistent DNS, and difficulty reaching printers or shared folders. Use one DHCP server per broadcast domain. If both routers must route separate networks, use different LAN subnets and accept the resulting double NAT.
There is an IP address conflict
Keep the router’s own LAN address outside the dynamic pool and avoid manually assigning an address that the DHCP server may also offer. For printers, cameras, servers, and similar devices, use a DHCP reservation when available. A reservation binds a selected address to the device’s MAC address while allowing the device to remain configured for DHCP. TP-Link documents DHCP reservation as an IP-to-MAC binding.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Should you use DHCP reservations or static IP addresses?
DHCP is usually the best default for home devices because it centralizes settings, reduces typing errors, reuses addresses efficiently, and makes gateway or DNS changes easier.
| Method | Best use | Trade-off |
|---|---|---|
| Ordinary DHCP | Phones, laptops, televisions, and general home devices | An address can change after lease renewal or network changes |
| DHCP reservation | Printers, cameras, servers, and devices that need a stable address | Requires maintaining a reservation list on the router |
| Manual static address | Devices or legacy systems that specifically require local manual configuration | More typing, more conflict risk, and harder centralized changes |
A reservation is often the practical compromise: the device receives its settings through DHCP but normally receives the same address.
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Should you replace the router to fix DHCP?
Usually, no. Correcting WAN mode, LAN DHCP, client addressing, or a duplicate DHCP server normally requires no purchase. Consider replacement hardware only when the current router has obsolete firmware, lacks access-point mode, cannot provide needed reservations or VLANs, cannot support the required clients, or has a hardware fault.
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If the actual problem is poor coverage, a wired access point or mesh system is usually cleaner than adding a second router in normal router mode. A mesh system may be easier to manage but can expose fewer advanced DHCP, VLAN, or routing controls. A business firewall or managed DHCP platform suits multiple VLANs, centralized policies, or failover requirements, but is excessive for a simple home network.
Security and maintenance after configuration
- Change the router administrator password from the factory default.
- Keep firmware updated according to the manufacturer’s support policy.
- Do not expose router administration to the public Internet unless there is a deliberate and secured reason.
- Run only the DHCP services that the network design requires.
- Back up the router configuration if the router supports configuration export.
- Do not treat disabling DHCP as a general security improvement; Wi-Fi security, administrator protection, segmentation, and firewall configuration matter more.
IPv4 DHCP and IPv6 address configuration are not interchangeable. IPv6 networks may use SLAAC, DHCPv6, or both, depending on the network design. The IPv4 steps in this guide should not be assumed to configure IPv6.
Frequently Asked Questions
Should DHCP be enabled or disabled on my home router?
Enable the LAN DHCP server when the router is responsible for assigning addresses to devices on the home network. Disable it on a secondary router that is operating as an access point or bridge on the same LAN, because the main router should normally provide DHCP.
Should the router’s WAN connection use DHCP?
The router’s WAN connection should use DHCP, usually labeled Dynamic IP or Automatic IP, when the ISP, modem, ONT, or upstream router supplies the Internet address automatically. Use PPPoE, static IP, VLAN, or another setting when the ISP specifically requires it.
Can two routers both use DHCP?
Two routers can each use DHCP when they route separate networks with different LAN subnets, but two DHCP servers on the same LAN can conflict. Use access-point or bridge mode on the second device when one shared network is intended.
Why does my device show a 169.254.x.x address?
A 169.254.x.x IPv4 address generally means the device did not obtain a DHCP lease and assigned itself a local address. Check the device’s connection, automatic-addressing setting, DHCP server, VLAN or SSID, cable, and available address pool.
Do I need a static IP address for a printer?
You usually do not need a manually configured static IP for a printer. A DHCP reservation is often better because the printer remains centrally managed through DHCP while normally receiving the same address.
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For an ordinary home network, configure the router’s WAN as Dynamic IP/DHCP when the upstream network assigns the router an address, enable the router’s LAN DHCP server for local devices, and set computers and phones to automatic addressing. Use only one DHCP server per shared LAN, choose a pool in the router’s subnet, and verify the client IP, gateway, DNS, WAN address, and Internet access.
