computer science question in python: Task $1\mathrm{.}3$: Traceroute

The objective of this task is to use Scapy to estimate the distance, in terms of number of routers, between

your VM and a selected destination. This is basically what is implemented by the traceroute tool. In this

task, we will write our own tool. The idea is quite straightforward: just send a packet $($any type$)$ to the

destination, with its Time$-$To$-$Live $($TTL$)$ field set to $1$ first. This packet will be dropped by the first router,

which will send us an ICMP error message, telling us that the time$-$to$-$live has exceeded. That is how we

'This project is based on SEED labs by Wenliang Du$,$ Syracuse University.

get the IP address of the first router. We then increase our TTL field to $2,$ send out another packet, and

get the IP address of the second router. We will repeat this procedure until our packet finally reach the

destination. It should be noted that this experiment only gets an estimated result, because in theory, not

all these packets take the same route $($but in practice, they may within a short period of time$).$ The code in

the following shows one round in the procedure.

$a=IP()$

a$.$dst $=\text{'}1\mathrm{.}2\mathrm{.}3\mathrm{.}4\text{'}$

a$.$ttl $=3$

$b=$ICMP$()$

send $(\frac{a}{b})$

If you are an experienced Python programmer, you can write your tool to perform the entire

procedure automatically. If you are new to Python programming, you can do it by manually

changing the TTL field in each round, and record the IP address based on your observation

from Wireshark. Either way is acceptable, as long as you get the result.