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Category: linux

I can not ask anymore Linux and memory basics & detailed usage of vmstat

Sakura Internet Advent Calendar On the last day, I would like to take a fair look at the basic knowledge of Linux memory. Recently, I became able to program without consciousness of the server and less consciousness about the free space of the memory, but when it became a situation where it is necessary to touch the low layer, the OS is stunned in front of me It seems that there are many people to […]

[Polite explanation] How to use Linux firewall iptables

There are many things you would like to set up a firewall on Linux, too.Rather, because it is used as a server in a company, it is a place I want to be more careful about than a personal computer.This page tells about iptables to set up firewall on Linux.  table of contents[hide] 1What is a firewall? 2What is iptables? 3iptables setting confirmation and explanation 3.1Chain 3.2Each item 3.3ALL? 3.4Adaptation order of iptables FourHow to […]

IPsec ( Security Architecture for IP )

◆ What is IPsec?   IPsec,Encryption systemUsed to protect the security of data at the network layer by the technology It is a protocol to be done. IPsec consists of protocols such as AH, ESP, and IKE. This IPsec By using the VPN connection we can communicate safely even in the public infrastructure such as the Internet. ◆IPsec works layer Since IPsec operates at the network layer, whether it is TCP or UDP at the […]

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