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cURL​

vim curl.format
time_namelookup:  %{time_namelookup}\n
       time_connect:  %{time_connect}\n
    time_appconnect:  %{time_appconnect}\n
      time_redirect:  %{time_redirect}\n
   time_pretransfer:  %{time_pretransfer}\n
 time_starttransfer:  %{time_starttransfer}\n
                    ----------\n
         time_total:  %{time_total}\n

执行curl命令

 curl -w "@curl.format" -s https://qq.com   -I
HTTP/2 302
date: Thu, 06 Aug 2020 13:07:14 GMT
content-type: text/html
server: squid/3.5.24
location: https://www.qq.com?fromdefault
expires: Thu, 06 Aug 2020 13:08:15 GMT
cache-control: max-age=60
vary: Accept-Encoding
x-cache: EXPIRED from shenzhen.qq.com

time_namelookup:  0.005594
        time_connect:  0.014348
     time_appconnect:  0.053759
       time_redirect:  0.000000
    time_pretransfer:  0.053873
  time_starttransfer:  0.099312
                     ----------
          time_total:  0.099468

上面几个参数的解释

  • time_namelookup：DNS 域 d名解析的时候，就是把 https://qq.com 转换成 ip 地址的过程
  • time_connect：TCP 连接建立的时间，就是三次握手的时间
  • time_appconnect：SSL/SSH 等上层协议建立连接的时间，比如 connect/handshake 的时间
  • time_redirect：从开始到最后一个请求事务的时间
  • time_pretransfer：从请求开始到响应开始传输的时间
  • time_starttransfer：从请求开始到第一个字节将要传输的时间
  • time_total：本次请求花费的全部时间

httpstat​

httpstat 是Python封装的工具，本质上封装的cURL命令

安装​

pip install httpstat

使用​

httpstat https://www.taobao.com

iperf3​

iperf3 -c 42.193.116.59 -p 5201 -u -b 5M -t 240 -i 5

-p 执行端口号 -u 使用udp -b 指定MiB包 -t 持续时间/s

Socks5代理配置​

系统: ubuntu: 22.0.4

apt update
apt install dante-server
systemctl status danted.service

vim /etc/danted.conf

logoutput: /tmp/socks.log

internal: eth0 port = 1082

external: eth0

clientmethod: none

socksmethod: username

user.privileged: root

user.notprivileged: nobody


client pass {

        from: 0.0.0.0/0 to: 0.0.0.0/0

        log: error connect disconnect

}
client block {

        from: 0.0.0.0/0 to: 0.0.0.0/0

        log: connect error

}
socks pass {

        from: 0.0.0.0/0 to: 0.0.0.0/0

        command: bind connect udpassociate

        log: error connect disconnect

        socksmethod: username

}
socks block {

        from: 0.0.0.0/0 to: 0.0.0.0/0

        log: connect error

}


sudo useradd -r -s /bin/false danted
sudo passwd danted
sudo systemctl disable ufw
sudo systemctl restart danted.service

curl -v -x socks5://danted:密码@服务器地址:端口 http://www.xxxx.com/

TCP​

选择性重传

快速选择性重传(一般是跟选择性重传一起配合来使用)，在wireshark中表示TCP Fast Retransmission

数据包

告诉服务器当前已收到数据包长度的范围，需要告诉服务器需要重传的范围: 34895 599618 +1440之间的数据

左边缘348960 1058-348960 9698右边缘 左边缘348961 1138-348961 4018右边缘