wireshark packet capture

the host name 119.75.218.70 Steps (3), (4) corresponding to the first two DNS messages 17, 18, to further obtain the details of these two steps, you have to understand the DNS protocol, details see:Blog "DNS protocol for deep understanding of TCP/IP protocol stacks with Wireshark capture Packet"2.2 Establishing a TCP link (19~24)HTTP uses TCP as the underl

Turn from:Http://blog.chinaunix.net/uid-9112803-id-3212041.htmlSummary:In this paper, we briefly introduce the theory of TCP-oriented connection, describe the meanings of each field of TCP messages, and select TCP connections from Wireshark capture packet to establish the relevant message segment.I. OverviewTCP is a reliable connection-oriented transport protocol

next expected sequence number of the connection, one or more of the previous messages failed to arrive Disorderly Sequence Message : The serial number of the current message is lower than the previously received message from the connection previous fragment failed to capture : (Wireshark 1.8.x and above): Lost with previous message. When does it happen?The user may see the disorderly sequence

The following is a network packet capture tutorial in Ubuntu. 1. install wireshark terminal run: sudoapt-getinstallwireshark2. modify init. when lua runs wireshark directly, the following error occurs: Lua: Errorduringloading: [string "/usr/share/wireshark/init. lua "]: 45:

the data packet, and Ack isThe sequence number expected next time. Window indicates the size of the window that receives the cache. Urgent indicates whether there is an emergency pointer in the data packet.Options is an option. (4) UDP packet output informationThe general output information of the UDP packet captured with tcpdump is:Route. port1> ice. port2: UDP

the data packet, and Ack isThe sequence number expected next time. Window indicates the size of the window that receives the cache. Urgent indicates whether there is an emergency pointer in the data packet.Options is an option. (4) UDP packet output informationThe general output information of the UDP packet captured with tcpdump is:Route. port1> ice. port2: UDP

Recently, when learning the NIC driver, we need to capture the situations where the Nic sends and receives data. so we found the tcpdump and wireshark tools, which are used to capture data, wireshark is used to analyze the captured data. the usage is recorded below: Tcpdump usage method (1) first, key words about the t

reassembled TCP segments (4614 bytes): #3675 (1460), #3676 (1460), #3678 (1460), #3679 (234)]hypertext Transfer Protocol http/1.1 ok\r\n content-encoding:gzip\r\n content-type:application/json;charset=utf-8\r\ n date:wed, 05:37:22 gmt\r\n server:nginx\r\n vary:accept-encoding\r\n content-length:4404\r\n connection:keep-alive\r\n \ r \ n [HTTP response 1/3] [time since request:1.256983000 seconds] [request in FRAME:3615] [Next REQuest in frame:3705] [Next response in frame:3779] content-enco