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How do I use subnetting and subnet masks for ECS instances? In view of this problem, this article introduces the corresponding analysis and answers in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

Subnetting and mask representation of ECS instances

Representation method of subnet mask

Subnet masks are generally represented in two ways:

Method 1: represent it in dotted decimal in the same format as the IP address, such as:

Class B IP address: 255.255.0.0

Class C IP address: 255.255.255.0

Method 2: add a backslash (/) and a number from 1 to 32 after the IP address, wherein the number from 1 to 32 indicates the length of the network identification bit in the subnet mask.

For example, WAF needs to add a whitelist, which can be expressed in method 2:

For example, the subnet mask 112.124.214.0 Universe 24 is equivalent to 255.255.255.0.

Subnetting

Take the IP address 192.168.1.0 Universe 26 and its mask as an example:

IP:192.168.1.0/26

Mask: 255.255.255.192

Its binary expression is: 11111111.11111111.11111111.11000000.

The first 24 bits are its network address, and the last 8 bits are its host address.

The first two bits of the host address are set to 1, so:

Number of subnets: 22-2 = 2

Block size = 256192 = 64

The subnet IP range is:

The available IP range for the first subnet: 192.168.1.65-192.168.1.126

Network address: 192.168.1.64

Broadcast address: 192.168.1.127

The available IP range of the second subnet: 192.168.1.129-192.168.1.190

Network address: 192.168.1.128

Broadcast address: 192.168.1.191

This is the answer to the question on how to use ECS instance subnetting and subnet mask. I hope the above content can be of some help to you. If you still have a lot of questions to be solved, you can follow the industry information channel for more related knowledge.

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