Can anyone help to complete this "Sniffing and Spoofing" lab?

Task 1 a: download the sniffex.c program from the tutorial http://www.tcpdump.org/pcap.htm b: Capture the ICMP packets between two specific hosts. Capture the TCP packets that have a destination port range from to port 10 100. c: Sniffing Passwords on telnet.

Task2 a: an ICMP spoofing program b: Spoof an ICMP Echo Request. Spoof an ICMP echo request packet on behalf of another machine c: Spoof an Ethernet Frame. Spoof an Ethernet Frame. Set 01:02:03:04:05:06 as the source address.

Better use C language if possible.Thanks!