DHCP (Dynamic Host Configuration Protocol) is the router service that automatically hands each device an IP address, DNS server, and gateway the moment it connects — no manual setup required. A static IP is the opposite: an address typed in by hand that never changes. Most devices should use DHCP; a few always-on devices — a NAS, printer, or camera — are better pinned down with a DHCP reservation instead of a fully manual static IP.
What DHCP Actually Does
Every device that joins a network needs an IP address before it can do anything else — without one it cannot send or receive a single packet. DHCP automates that handoff: when a phone joins WiFi, it broadcasts a request, the router's DHCP server picks the next available address from a defined pool (commonly something like 192.168.1.100 through 192.168.1.250), and leases it to the device for a set period, typically 24 hours. The device also receives the DNS server address (often the quiet factor behind how fast lookups feel — see what DNS actually does) and default gateway in the same handshake. This is why a phone or laptop just works on a new network with zero configuration — DHCP is doing the entire job silently in the background, and on a router like the TP-Link Deco X55 it runs by default on every node without any setup at all.
What a Static IP Is
A static IP is manually typed into a device's network settings and stays fixed regardless of leases, reboots, or how long the device has been offline. Historically this was the only way to guarantee a device's address never moved — useful for anything another device or piece of software needed to find reliably. The tradeoff is that static configuration is entirely manual: get the subnet, gateway, or DNS entry wrong and the device can lose network access outright, and if two devices are ever accidentally given the same static address, both can drop off the network with no obvious error message.
The Best of Both: DHCP Reservations
Most modern routers offer a middle path that solves the actual problem people reach for static IPs to solve: the DHCP reservation. A reservation ties a device's hardware (MAC) address to a specific IP inside the normal DHCP pool, so the router always hands that device the same address — but DHCP is still doing the assigning, still passing along DNS and gateway settings automatically, and there is no manual per-device configuration to get wrong. This is the right tool for the NAS that needs a fixed address for the port-forwarding rule described in how NAT and port forwarding work, or for a printer that needs to be found at the same address every time. On the TP-Link Archer AX73's admin panel, reservations live in the same DHCP settings screen as the address pool itself, usually a matter of picking a connected device from a list and locking it in.
When a Fully Manual Static IP Still Makes Sense
Reservations cover nearly every home case, but a handful of situations still call for a true static IP configured on the device itself: setting up a device before it has ever talked to the router (some network hardware, cameras, and industrial gear), building a secondary network segment the main router's DHCP server does not manage, or configuring a device that will move between networks where a reservation would not follow it. Outside of those, a reservation gets the same predictability with far less manual upkeep.
What Goes Wrong When Addresses Collide
An IP conflict happens when two devices end up with the same address at once — most often a manually configured static IP landing inside the router's active DHCP pool. Symptoms are usually confusing rather than obvious: intermittent connectivity, one device working while the other silently drops, or both bouncing on and off the network. The fix is either to move static assignments outside the DHCP pool's range entirely, or better, replace them with reservations so the router itself guarantees no overlap ever occurs.
Frequently Asked Questions
Does DHCP slow down my network?
No — the DHCP handshake happens once when a device joins and takes a fraction of a second; it has no effect on ongoing browsing, streaming, or download speed.
Should I set a static IP on my gaming console?
A DHCP reservation is the better choice for the same result: a fixed address for port-forwarding rules, without manually entering DNS and gateway settings that a typo could break.
Why does my device sometimes get a different IP address?
Without a reservation, a device released back into the DHCP pool (after its lease expires while offline, for instance) can be handed a different available address the next time it connects. This is normal DHCP behavior, not a fault.
Can I mix static IPs and DHCP on the same network?
Yes, as long as static addresses sit outside the router's DHCP pool range — otherwise the router may eventually hand out an address already claimed by a static device.
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