Flags [none] Client-Ethernet-Address 00:0c:xx:xx:xx:d5 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Request Requested-IP Option 50, length 4: 10.10.1.163 Hostname Option 12, length 14: "test-ubuntu" Parameter-Request Option 55, length 16: Subnet-M...
0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0c:xx:xx:xx:d5, length 300, xid 0xc9779c2a, Flags [none] Client-Ethernet-Address 00:0c:xx:xx:xx:d5 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Request Requested-IP Option 50, l...
现在需求就变成了:用 tcpdump 在 Nginx 上,filter 出来 IP 为 A 的请求的 HTTP header,以便根据 header 中的信息找到调用来源的团队,和他们沟通重建连接的问题。 通过阅读TOA 的源代码可以发现,代码中还原用户真实的 IP 地址的方式:遍历 TCP Option 字段,直到找到option code为 254(TCP option 254 是一个实验...
192.168.1.136.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 70:3a:a6:cb:27:3c, length 292, xid 0x3ccba40c, secs 11529, Flags [none] Client-IP 192.168.1.136 Client-Ethernet-Address 70:3a:a6:cb:27:3c Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message (53), length 1:...
监听IP之间的包 tcpdump ip host 192.168.1.11 and 192.168.1.60 11:57:52.742468 IP 192.168.1.11.38978 > hello.http: Flags [S], seq 3437424457, win 64240, options [mss 1460,sackOK,TS val 2166810854 ecr 0,nop,wscale 7], length 0
监听指定IP的包 代码语言:javascript 复制 tcpdump host192.168.1.11复制代码 监听指定来源IP 代码语言:javascript 复制 tcpdump src host192.168.1.11复制代码 监听目标地址IP 代码语言:javascript 复制 tcpdump dst host192.168.1.11复制代码 监听指定端口 代码语言:javascript ...
tcpdump ip host 192.168.1.11 and 192.168.1.60 11:57:52.742468 IP 192.168.1.11.38978 > hello.http: Flags [S], seq 3437424457, win 64240, options [mss 1460,sackOK,TS val 2166810854 ecr 0,nop,wscale 7], length 0 11:57:52.742606 IP hello.http > 192.168.1.11.38978: Flags [S.], seq...
tcpdump.sh{ [-h] | [-a] | [-i ethx] [-w filename] [-c packetnumber] [src ipaddress] [and | or] [dst ipaddress] [and | or] [port portnumber] [-k] [-d] } 参数说明 参数 参数说明 取值 -h显示帮助信息。 - -a显示脚本每个参数的具体意义。
[Protocolsinframe: eth:ip:tcp:smtp] Ethernet II, Src: Cisco_X (00:11:5c:X), Dst: 3Com_X (00:04:75:X) Destination: 3Com_X (00:04:75:X) Address: 3Com_X (00:04:75:X) ... ...0... ... ... ... =IG bit: Individual address (unicast) ... ....
Directly visible from the example are: • MAC-Address of sender and receiver • Ethertype field (here vlan-tagged packet) • Vlan 717 with no priority tags (p 0) • Subethertype (here ipv4) • Source and destination IPv4 address • Type of packet (here ICMP echo request/reply...