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Net

参考


常用命令

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while true; do
    RX1=$(cat /sys/class/net/enp65s0f0/statistics/rx_bytes)
    TX1=$(cat /sys/class/net/enp65s0f0/statistics/tx_bytes)

    sleep 1

    RX2=$(cat /sys/class/net/enp65s0f0/statistics/rx_bytes)
    TX2=$(cat /sys/class/net/enp65s0f0/statistics/tx_bytes)

    RX_BYTES=$((RX2 - RX1))
    TX_BYTES=$((TX2 - TX1))

    RX_BITS=$((RX_BYTES * 8))
    TX_BITS=$((TX_BYTES * 8))

    RX_GB=$(echo "scale=2; $RX_BYTES / 1024 / 1024 / 1024" | bc)
    TX_GB=$(echo "scale=2; $TX_BYTES / 1024 / 1024 / 1024" | bc)

    RX_GBIT=$(echo "scale=2; $RX_BITS / 1024 / 1024 / 1024" | bc)
    TX_GBIT=$(echo "scale=2; $TX_BITS / 1024 / 1024 / 1024" | bc)

    clear

    echo "Receive:"
    echo "  $RX_GB GBytes/second"
    echo "  $RX_GBIT GBits/second"

    echo

    echo "Transmit:"
    echo "  $TX_GB GBytes/second"
    echo "  $TX_GBIT GBits/second"
done

net

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sudo vi /etc/netplan/00-installer-config.yaml

  • 静态 IP

    YAML
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    network:
  ethernets:
      eth0:
        dhcp4: false
        addresses:
          - 10.0.0.2/24
        routes:
          - to: default
            via: 10.0.0.1
        nameservers:
          addresses: [10.0.0.1,8.8.8.8]
  version: 2


port

  • 查看某进程占用的端口

    Bash
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    watch -n 1 'lsof -i -nP | grep 进程'


tcpdump

  • 查看某端口的 TCP 流量

    Bash
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    sudo tcpdump -i any port 10086

  • 查看某端口的 UDP 流量

    Bash
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    sudo tcpdump -i any udp port 10086

  • 查看某 IP 的 TCP 流量

    Bash
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    sudo tcpdump -i any host 127.0.0.1

  • 查看某 IP 的 UDP 流量

    Bash
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    sudo tcpdump -i any udp and host

ip route

traceroute

curl

  • 代理请求 curl -x http://192.168.19.19:7890

wget

  • 带密码下载 wget --http-user=用户名 --http-password=密码 http://url

  • 代理下载 wget -e "https_proxy=http://192.168.19.19:7890"

use

生成密钥对

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ssh-keygen -t rsa -m PEM -b 4096 -C "[email protected]"
  • -t：密钥类型
  • -m：密钥格式
  • -b：密钥位数
  • -C：追加到公钥文件末尾以便于识别的注释

免密登录

remote：将公钥 id_rsa.pub 放入 authorized_keys

local：修改私钥 id_rsa 权限 chmod 600 ~/.ssh/id_rsa