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None Source string added cnp3-ebook exercises/trace French	English 0 characters edited The TCP connection is then closed by exchanging three segments, the first two having the `FIN` flag set. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited The server then sends its response, which fits inside a single segment. The client acknowledges the reception of this segment. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited The two lines above correspond to the request sent by the client and the acknowledgment returned by the server. Note that the first byte sent by the client has `1` as relative sequence number. In this example, the HTTP request has a total length of 92 bytes. This request is immediately acknowledged by the server. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited The following three lines of the tcpdump_ output correspond to TCP's three-way handshake. There are several interesting points to note in this output. First, ``Flags [S]`` indicates that the `SYN` flag was set in the first and second segments. In this first segment, tcpdump_ indicates the initial sequence number (``2681184541``). In the second segment, tcpdump_ indicates both the initial sequence number (``3804204915``) and the acknowledgment number (``2681184542``). Both segments contain TCP options. Starting in the third segment, tcpdump_ shows relative sequence numbers. Thus, the acknowledgment that you observe in the third segment is an acknowledgment for the `SYN` returned by the server. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited A first solution to analyze this trace is to use tcpdump_ on the command line. The `-n` disables the reverse DNS lookups that tcpdump_ does by default for all IP addresses. The `-r` argument is the name of the file contained the captured packets. The trace starts with the DNS request. This request was sent over IPv4 which is the default on this host. tcpdump_ indicates the query and the response returned by the local DNS resolver. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited The ``-6`` parameter passed to curl_ forces the utilization of IPv6. curl_ returns an HTML page that indicates that https must be used instead of http to access this web site. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited As an illustration, let us use tcpdump_ to analyze the packets exchanged while executing the following command on a Linux host: 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited tcpdump_ is probably one of the most well known packet capture software. It is able to both capture packets and display their content. tcpdump_ is a text-based tool that can display the value of the most important fields of the captured packets. Additional information about tcpdump_ may be found in :manpage:`tcpdump(1)`. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited Several packet trace analysis tools are available, either as commercial or open-source tools. These tools are able to capture all the packets exchanged on a link. Of course, capturing packets require administrator privileges. They can also analyze the content of the captured packets and display information about them. The captured packets can be stored in a file for offline analysis. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited When debugging networking problems or to figure out performance problems, it is sometimes useful to capture the segments that are exchanged between two hosts and to analyze them. 5 years ago
None Source string added cnp3-ebook exercises/trace French	English 0 characters edited Analyzing packet traces 5 years ago
gegoa Component created cnp3-ebook exercises/trace	Component created 5 years ago
gegoa Translation added cnp3-ebook exercises/tls French	English TLS and ssh French 10 characters edited Current translation TLS et SSH 5 years ago
None Changes pushed cnp3-ebook index	Changes pushed 5 years ago
gegoa Translation added cnp3-ebook exercises/tls French	English Footnotes French 21 characters edited Current translation Notes de pied de page 5 years ago
gegoa Translation added cnp3-ebook exercises/tcp French	English Footnotes French 21 characters edited Current translation Notes de pied de page 5 years ago
gegoa Translation added cnp3-ebook exercises/tcp-2 French	English Footnotes French 21 characters edited Current translation Notes de pied de page 5 years ago
gegoa Translation added cnp3-ebook exercises/http French	English Footnotes French 21 characters edited Current translation Notes de pied de page 5 years ago
gegoa Translation added cnp3-ebook exercises/email French	English Footnotes French 21 characters edited Current translation Notes de pied de page 5 years ago
gegoa Translation added cnp3-ebook exercises/dns French	English Footnotes French 21 characters edited Current translation Notes de pied de page 5 years ago

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