Task 2.1B:

Writing Filters. Please write filter expressions for your sniffer program to capture each of the followings. You can find online manuals for pcap filters. In your lab reports, you need to include screenshots to show the results after applying each of these filters.

Capture the ICMP packets between two specific hosts.

Capture the TCP packets with a destination port number in the range from 10 to 100.

Task 2.1C:

Sniffing Passwords. Please show how you can use your sniffer program to capture the password when somebody is using telnet on the network that you are monitoring. You may need to modify your sniffer code to print out the data part of a captured TCP packet (telnet uses TCP). It is acceptable if you print out the entire data part, and then manually mark where the password (or part of it) is.