[Bartosz]

Hi,

Following the lecture “Using Scapy To Create an ARP Request”, when I run the program I get this return:

ARP who has ?? says ??

code:

“””
#!/usr/bin/env python

import scapy.all as scapy

def scan(ip):
arp_request = scapy.ARP(pdst=ip)
print(arp_request.summary())

scan(“10.0.2.1/24”)
“””

I tried:
1. the alternative function code:
def scan(ip):
arp_request = scapy.ARP()
arp_request.pdst=ip
print(arp_request.summary())

2. reinstalling scapy

3. Installing the COMPLETE version of scapy
$ pip install –pre scapy[complete] -> didn’t work, but the pip3 method did:
pip3 install –pre scapy[complete]

4. running the program with python3
(python3 network_scanner.py
instead of
python network_scanner.py)

5. I thought maybe python can’t print it out because the return is not a string, so, out of despair, I tried “””print(str(arp_request.summary()))””” – but that didn’t help either.

Nothing helped, still getting the same result. (“ARP who has ?? says ??”)
Any further suggestions would be highly appreciated 🙂

[Bartosz]

IMPORTANT NOTE:

i just realized that feeding the function just a single IP works.

So instead of using the range:
scan(“10.0.2.1/24”)

using just:
scan(“10.0.2.1.X”)

works as expected.
How can I translate this functionality to use IP ranges?

[Zaid Sabih]

Please try the following fix and it should allow you to search for ranges as shown in the lecture
pip uninstall scapy

pip install scapy==2.4.0

pip3 install scapy==2.4.0

[Bartosz]

RESOLVED, thank you very much!

version 2.4.2 works as well

[Bartosz]

…but so may other features still don’t, that I’ve decided to roll back to 2.4.0, as you suggested 🙂

Just wanted to share in case others experience similar issues.
Thanks again!

[Zaid Sabih]

You’re welcome, I’m glad I could help 🙂

[Laurent]

Hi, I had the same issue. The above fix worked. Thank you for that.
However, I wanted to ask what version of scapy was installed earlier and whether we upgraded it to a newer version or rolled back to an older one. If it is an older version, does it mean we will run into problems when python will update?

[Vashisht Boodhun]

Actualy when we tested the new version, it didn’t work as expected that’s why we suggest to use the older version of scaoy.

[Author]

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