If you are in a small LAN, you may not need to consider the IP address is not enough, but in a large LAN that exceeds "255" computers, you must consider how to solve the problem that the computer IP address is not enough.
Many times, the private network address 192.168.1.x-255 appears in the enterprise local area network is not enough. After removing a broadcast address and a network address, it may not be enough. (0 is the network address is not available, 255 is the broadcast address, except for these 2, available is 254 addresses).
So how to solve it?
First, let's take a look at the IP address: "XXXX", where x represents any natural number between 0 and 255. However, in the LAN, the number setting here is regular, usually divided by the subnet mask. For example, 255.255.255.0. Note that the last X can be changed freely from 0 to 255. When the gateway is 192.168.1.1, we can set it to 192.168.1.1--192.168.1.254. When a ip address exceeds the number in a LAN, this usually occurs in the C-type ip address LAN, there are three ways to solve this problem.
First, change the subnet mask
Therefore, when the subnet mask is set to 255.255.255.0, the LAN below the router can only allocate relatively independent IP addresses to "254" computers.
To increase the LAN IP, you can modify the subnet mask. For example, if the subnet mask is changed from 255.255.255.0 to 255.255.0.0, then the IP of the computer in our LAN is equivalent to 254 times 254 computers. There are 64,516 IP addresses. The third X of the IP can also change from 192 to 255 to any number between 192.168.XX. If you need more, you can set it to 255.0.0.0, and the LAN can have 254*254*254 computers.
However, if you set this up, it means that all of these computers are in a LAN, and they can access each other, which is easy to cause "network storm."
Second, the method of adding routers
It can also be divided into multiple network segments by connecting routers behind the router, but this method is not very large. If the original network segment is 192.168.1.1. Then you can add a new network segment, 192.168.X.1.
Steps: Add a new router! Assign an IP address to the new router under static IP binding, and then enable DHCP if you want to save trouble. If you don't want to save trouble, set your own IP address.
The gateway of the router must be changed! The default is 192.168.0.1 or 192.168.1.1, the gateway of your new network segment should be 192.168.X.1 remember! If your new IP address is set to 192.168.2.1. The IP address pool of the new router can be between 192.168.2.2~~~192.168.2.254.
Connection method: The previous router LAN port is connected to the WAN port of the current router. Then your new router will be online. You can connect another switch to the LAN port of the new router.
Third, divide vlan
The ideal method is to set the virtual LAN "VLAN" to divide the computer in the LAN into multiple virtual LANs, which can reduce network storms and improve the efficiency of switches and routers. Some switches have VLAN interfaces, so just connect the network cables to the corresponding network segments as needed.
Divide by subnet! You can set the IP address to 192.168.0.0/23
Then you can divide the two network segments 192.168.0.x and 192.168.1.x, increase the number of IP, and of course continue to divide multiple network segments.
Network segment 1: 192.168.0.x, 192.168.0.1 - 192.168.0.254, subnet mask 255.255.254.0.
Segment 2: 192.168.1.x, 192.1681.1 - 192.168.1.254, 255.255.254.0.
This allows 192.168.0.x and 192.168.1.x to interoperate without the need for additional equipment.
Fourth, supplement
Here, the weak electric Jun added, many friends may ask, how the ip address 192.168.0.0/23 calculates its subcode mask is 255.255.254.0.
23 is the CIDR value. Simply put, a CIDR value corresponds to a subnet mask, and then the network is segmented.
Each IP address has a length of 32 bits and is divided into 4 segments of 8 bits (1 byte). Simply say 23 represents 23 from the heading, which is 11111111.11111111.11111110.00000000
Converting this to decimal is 255.255.254.0, and the subnet mask is calculated this way.
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