Introduction: The Timer of the Web
Every IP address given to you by your router comes with an expiration date, known as the DHCP Lease Time. Most home routers set this to 24 hours by default. But for a busy coffee shop or a massive corporate office, 24 hours might actually be a disaster. Selecting the right lease time is a balancing act between network 'cleanliness' and server 'chatter'.
In this guide, we'll explain the pros and cons of different lease lengths and help you decide which is right for your network.
The Trade-Off: Short vs. Long
Short Lease Times (e.g., 2 hours)
- The Good: Perfect for public places. If 200 people visit a cafe in one day, a short lease ensures that as soon as a customer leaves, their IP address is immediately available for the next person.
- The Bad: It creates more 'background noise'. Devices have to talk to the router more often to renew their leases, which can slightly slow down a busy server.
Long Lease Times (e.g., 7 days)
- The Good: Very stable. Devices almost never have to ask for a new IP. Perfect for home offices where the same five devices are always there.
- The Bad: Your 'pool' can fill up. If you have a party and 20 friends join your Wi-Fi, their IPs stay 'reserved' for a whole week even after they leave, potentially blocking new devices from joining.
Conclusion
Lease times are the 'inventory management' of networking. Choosing the right one ensures that you always have a 'seat' available for every device that needs one. Test your current lease length here.