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Connecting to serial port (com port) over network

(Serial port or com port? - Serial ports are often refered as COM ports. It is the same to be short. You can read abut it in the Wiki article )

• The problem
• The solution in theory
• WINDOWS
  • Server
  • Client

• Driver Signature

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ng-file-upload example with NodeJS

index.html should be in public folder in the same directory with app.js.

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Linux 基于策略的路由(Linux Policy Routing)

Linux 有传统的基于数据包目的地址的路由算法，和新的基于策略的路由算法
新算法优点：支持多个路由表，支持按数据报属性（源地址、目的地址、协议、端口、数据包大小、内容等）选择不同路由表


# 查看规则命令，后面可跟其它参数，默认为 show(list) 显示全部
ip rule

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Linux NetFilter, IP Tables and Conntrack Diagrams

IPTABLES TABLES and CHAINS

IPTables has the following 4 built-in tables.

1) Filter Table

Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.