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Routers with DHCP enabled assign IP addresses dynamically. It means that a random IP address is assigned to each device connected to the router, but that IP address may change later.
Some routers offer a “client lease time” setting, to make sure all devices connected will get the same IP address for a given amount of time. Even if the devices are rebooted or disconnected from the network.
However, if you require a device to keep the same IP Address always, there are other options:
- Use a static IP address.
- Use DHCP Reservation/Static DHCP Assignment.
The DHCP Reservation method can be configured from the router. On a Linksys E2500 router, follow the next steps:
- Enter the router settings.
- Go to Setup > Basic Setup.
- Click DHC Reservation.
- Find the device you want it to keep always the same IP address and mark it.
- Click Add.
- Voila! This device will get always the same IP address when connected to your router.
By preferring DHCP Reservation over a static IP address, you do not need to modify the adapter settings on your device each time it gets connected to a different network.