On my previous blog, I spoke in depth about how to use a public static IP address. It is also important to learn how to use static or DHCP private IP address. Private static IP addresses give us the benefit to assign an internal number to our internal devices and walk away. DHCP is a similar method to static and private IP addresses and are received from our gateway automatically. So, which one is more beneficial, static or DHCP? That is the question we will discuss in this blog.
DHCP (Dynamic Host Configuration Protocol) is client/server protocol that is automatically provided to our devices by our router. There are other numbers that are automatically assigned to our devices as well. These number are the subnet number, default gateway, and preferred and secondary DNS IP addresses. Every device in our private internal network based on TCP/IP must request a new number once they are connected our router. Based on the settings in our router, the private IP address and other relevant numbers are normally leased by 7 days. Once the lease time is up, each device will request a new IP address and usually will get the same numbers. Some of the higher end routers allow you the ability to indefinitely lease some of your devices. Since routers are a combination of a DHCP server and a switch, they remember each device’s unique MAC address. These routers bind the private IP address with the MAC address in their list; making sure each time the lease is up, to always assign the previous number of the private IP address.
For small residential or business gateways, DHCP TCP/IP protocol is not a major issue. Many of the connected devices will work with one another without resorting to changing the private IP to static or manual. However, if you are running multiple devices and you are using a residential router, then there is the chance that many of your devices could require new IP addresses from your router. These new devices are most likely wireless devices or smart devices in your home, requesting a new IP address for the first time or reconnecting after losing connection. If the security camera system was configured for remote access and the lease was up, there is a high chance it receives a new IP address. When I am performing port a forwarding request for a client, I always assign a static IP address that is outside of the DHCP range. Most routers will have a section in the web configuration page that allows you set a range of numbers for the DHCP server. By assigning a static IP address to your essential devices it puts those devices outside the DHCP server.
So, if you have switches connected to your gateway and are using a residential router, it is important to set private static IP addresses all your essential devices. These devices might be printers, copiers, your servers, and security camera system. If you are using a static IP address, please make sure to use an IP address that is outside the DHCP server range. If you are not able to alter the DHCP server’s range, simply count your devices, add 50 or 100, and set the static IP addresses of your essential devices to a number outside of those range.
Also Read: Best Outdoor Wireless Security System with DVR