Week 7 - asheesh8/NET-150-TECH-JOURNAL GitHub Wiki

Lab 7-1 Introduction to Traceroute

Q1... TTL: 1 SOURCE IP: 192.168.1.121 DESTINATION IP: 132.198.255.246

Q2... Source IP: 192.168.1.252 DESTINATION IP: 192.168.1.121

Q3... How many TTL exceeded from 192.168.1.252:::: 130,132,134 ---- 3 packets

Q4.. UNIQUE SOURCE IP + PRECEDING TTL:
192.168.1.252 + 1 10.0.0.112 + 2 10.0.2.2 + 3

Q5... PING REPLY IP (SUCESSFUL) 132.198.255.246 - packets 368,370,372

Q6... TTL of successful TTL = 128?

Q7 = REFLECTION: Traceroute works quite cool. It sends packets with a TTL starting at 1, and increments by 1 each round. Each router that recieves a packet decreases TTL by 1... WHEN IT HITS 0, the router drops, and sends back a TTL exceeded message relaying the IP. By collecting these replies hop to hop, traceroute can map the full path from src to dst!