206β - Πρωτόκολλα Επικοινωνιών Άσκηση 1.pdf
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Transcript of 206β - Πρωτόκολλα Επικοινωνιών Άσκηση 1.pdf
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...
: ..
M. Sc.: &
206 -
1 Wireshark Lab: Getting Started : .: 38 3/30/2015
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1 :
1. 10 Protocol
packet-listing Wireshark.
:
internet capture
Wireshark /
.
Protocol.
:
ARP - Address Resolution Protocol ( )
RFC 826
(link layer) (hardware address)
(network layer).
IPv4 Ethernet ( RFC 826
Ethernet (Ethernet Address Resolution Protocol)), ARP
IP ATM FDDI.
DNS - Domain Name System ( )
,
IP. DNS
(server) .
,
, HTTP, FTP, POP, IMAP
SMTP, (HTTP),
(FTP), email (POP IMAP).
HTTP - Hyper Text Transfer Protocol, .
(server)
(client).
IPv6 - Internet Protocol version 6
Internet (IP),
. IPv4,
. IPv6 Internet
-
Engineering Task Force, IETF,
IPv4.
TLS - Transport Layer Security
- (server -client)
"" .
TLS Secure Sockets Layer (SSL).
. TLS
: TLS Record Protocol TLS Handshake Protocol.
TCP - Transmission Control Protocol ,
.
.
UDP - User Datagram Protocol,
.
, . UDP
/
.
FTP - File Transfer Protocol, ,
TCP/IP.
/ ,
- .
ICMP - Internet Control Message Protocol.
/
, .. server.
To SSDP - Simple Service Discovery Protocol, HTTP.
,
.
capture
Wireshark.
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2. HTTP GET
HTTP ; ( ,
packetlisting , .
Time , menu Wireshark
View -> Time Display Format, , Time-of-day.
:
http://gaia.cs.umass.edu/wireshark-labs/INTRO-
wireshark-file1.html. Wireshark:
HTTP GET
HTTP OK :
HTTP OK-HTTP GET=Delay
58.814988000 58.670515000 = 0.144473000
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:
Time Reference
Set Time Reference
Time.
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3. gaia.cs.umass.edu (
www.net.cs.umass.edu); IP ;
:
IP (IP address-Internet
Protocol Address),
Internet Protocol standard. . IP
.
IP gaia.cs.umass.edu :
128.119.245.12
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IP Home-Desktop :
192.168.1.3
4. persistent non-persistent , ;
:
Persistent
Hyper Transfer Protocol Wireshark Connection: keep-alive\r\n
HTTP/1.1 Persistent.
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:
HTTP/1.0 (Connection) Non-Persistent ,
" Connection: keep-alive" http
Request. ,
Persistent .
HTTP/1.1 (Connection) Persistent ,
"Connection: close" HTTP Request.
.