capturing data through ethereal

Ethereal:
Ethereal is a network packet analyzer, which captures network packets and displays that packet data detailed as possible. In fact, it’s kind of a measuring tool that tries to measure what is going inside a network cable. It can be downloaded from www.ethereal.org
download ethereal

 Few main uses of Ethereal can be 
1. Network administrators can use it to troubleshoot network problems 
2. Network security engineers use it to examine security problems. 
3. Developers use it to debug protocol implementation. 
4. And we students will learn the basics of computer networks with its help. 

Task 02:
Capture data on the network using all the three auto-stop features i.e:





a) Packets-Based:
No of data packets captured =35 

b) Size-Based: Data captured about 1Mbytes.

  

c) Time Based : Data captured for 30 seconds is ;

  
Task 02: Filter on the capturing process on the basis of ;
Distination IP :

   

Port number : port (80)

  
Task 3 :
SMTP Protocol :

  
Findings:
Packet size = 423 bytes
Header size = 20 bytes
Checksum value = 0x2498 [validation disabled]
Time with refrence to the first packet = 0.12393000 sec
Source IP Address = 82.178.158.19
Destination IP Address = 10.110.160.100
Source MAC address = 7c:ad:74:e4:f6:d0
Destination MAC address = o8:ed:b9:86:6d:
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