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tcp(transmission control protocol)传输控制协议。

1 序号:每个数据包都有对应的一个序列号。(保证可靠性)
2 确认号:每发送1个数据包都需要收到对应的确认包,确认号=序号+1
3 窗口:滑动窗口,提高可靠性 提高报文发送效率,例如迟迟未收到确认号,会默认为数据包丢失需要重传,如果每个数据包都在等待确认号,会有一些延迟,导致堆积,降低发包效率,滑动窗口用于缓冲,也可发送一部分未收到确认号的数据。
TCP的6个标志位(Flag)(三次握手建立连接,四次挥手断开连接)
1 SYN:连接请求或者接受连接请求
(DNS协议默认是UDP的53端口)
2 FIN:连接结束,断开连接
3 RST:重置连接(reset)
4 IQ Option充值 ACK:确认标记位
5 PSH:催促标记位,将接受缓冲区内数据向上交付给应用程序,而不是等待缓冲区满后再交付。
6 URG:紧急标志位,将紧急数据排在普通数据的前面。
7 .:没有Flag(意思是除了S(开始连接),P(推送数据),F(结束连接),R(重置连接)四种类型外的其他情况,有可能是ACK也有可能是URG)

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The starting state of the menu will appear collapsed on smaller screens, and will appear non-collapsed on larger screens. When toggled IQ Option充值 using the button below, the menu will change.

Make sure to keep all page content within IQ Option充值 the #page-content-wrapper . The top navbar is optional, and just for demonstration. Just create an element with IQ Option充值 the #sidebarToggle ID which will toggle the menu when clicked.

【TCPDUMP 笔记 2022.8.18】

学习使我清醒 已于 2022-08-19 09:34:00 修改 9 收藏

TCPDUMP

TCPdump是Linux里常用的网络抓包工具(以centos 7.IQ Option充值 9虚拟机为例, 虚拟机IP10.0.0.128 宿主机IP 10.0.61.61 )
输入tcpdump会默认抓取第一个网络接口上所有的数据包,本机的第一个网卡是eth0。

第一列:时间
第二列:网络协议 IP
第三列:发送方的IP地址+端口号,其中bogon是主机号,54416是端口号。
bogon(名词):虚伪的人,沼泽林,人名(博贡)
第四列:箭头表示数据的流向
第五列:接收方的IP地址和端口号
第六列:数据包内容,包括Flags标识符,seq号,ack号,win窗口,数据长度,其中[P.]表示PUSH标志位协议为1。

TCP协议

在这里插入图片描述

tcp(transmission control protocol)传输控制协议。

1 序号:每个数据包都有对应的一个序列号。(保证可靠性)
2 确认号:每发送1个数据包都需要收到对应的确认包,确认号=序号+1
3 窗口:滑动窗口,提高可靠性 提高报文发送效率,例如迟迟未收到确认号,会默认为数据包丢失需要重传,如果每个数据包都在等待确认号,会有一些延迟,导致堆积,降低发包效率,滑动窗口用于缓冲,也可发送一部分未收到确认号的数据。
TCP的6个标志位(Flag)(三次握手建立连接,四次挥手断开连接)
1 SYN:连接请求或者接受连接请求
(DNS协议默认是UDP的53端口)
2 FIN:连接结束,断开连接
3 RST:重置连接(reset)
4 ACK:确认标记位
5 PSH:催促标记位,将接受缓冲区内数据向上交付给应用程序,而不是等待缓冲区满后再交付。
6 URG:紧急标志位,将紧急数据排在普通数据的前面。
7 .:没有Flag(意思是除了S(开始连接),P(推送数据),F(结束连接),R(重置连接)四种类型外的其他情况,有可能是ACK也有可能是URG)

TCPDUMP常见过滤规则

基于IP地址过滤 参数 host 截获特定主机的收发数据包。
截获特定方向的数据包 目的地址 IQ Option充值 IQ Option充值 dst 源地址 src
截获特定网段的数据包 net
基于端口的过滤规则 port (src port 、dst IQ Option充值 port)

常用的协议如http ,https,
也可直接加协议名称

基于协议过滤 protocal (网络层、传输层协议)

截获ICMP协议的报文,例如ip、ip6、arp、tcp、udp等,
注意:https,dns、ssh等应用层协议需要用语法 tcpdump port IQ Option充值 http

vv 更详细 比如NFS的回应包中的附加域会被打印,SMB数据包也会被完全解码
vvv 产生更详细的输出,如telnet时所使用的SB.SE选项会被打印,如果telnet同时使用的是图形界面,其相应的图形界面将会以16进制的方式打印出来。

[[email protected] ~]# tcpdump -A | grep baidu.com
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
15:08:30.190025 IP bogon.34439 > bogon.domain: 24886+ A? baidu.com. (27)
…d…5.#/ a6. baidu.com. 15:08:30.190147 IP bogon.34439 > bogon.IQ Option充值 domain: 16200+ AAAA? baidu.com. (27) . d. 5.IQ Option充值 #/ ?H…baidu.com…
…5…N…?H…baidu.com…dns…sa…w…,…,.‘…
…5…C…a6…baidu.com…n.DB…’.B

这命令是使用tee来把tcpdump的输出同时放到文件aa和标准输出中
tee功能说明:读取标准输入的数据,并将其内容输出成文件这个命令是通过重定向操作
重定向操作,效果同上

TCPDUMP过滤规则组合–逻辑运算

逻辑运算符:and or not
and:所有的条件都需要满足,也可以表示为 &&
or:只要有一个条件满足就可以,也可以表示为 ||
not:取反,也可以使用!
and例子

or例子

not例子

TCPDUMP高级过滤

补充 ALG穿透 SIP

SIP(Session initialization Protocol,会话初始协议)是由IETF(Internet Engineering Task Force,因特网工程任务组)制定的多媒体通信协议。
它是一个基于文本的应用层控制协议,用于创建、修改和释放一个或多个参与者的会话。SIP 是一种源于互联网的IP 语音会话控制协议,具有灵活、易于实现、便于扩展等特点。