CODEWITHSUNDEEP
pythonnetwork-programminglogicscapy
Lyra Orwell
Lyra Orwell

Reputation: 1266

Why does sender IP address increment in Scapy?

I am trying to make a TCP packet that is sent to my other computer 500 times. I have created this code:

from scapy.all import *
from scapy.utils import rdpcap
#Create your own packets
data = 'This is a test'
myPacket = Ether(src="00:E0:4C:00:02:42",dst="00:E0:4C:01:08:99")/IP(src="169.254.162.71/16",dst="169.254.208.208/16")/TCP()/Raw(load=data)
print(myPacket.show())
for i in range (0,500):
    sendp(myPacket, iface="Ethernet 4")  # sending packet at layer 2

The issue is that when I run this code, the computer receives packets with an incrementing Source IP and the Destination IP is wrong, for some reason:

enter image description here

Any help fixing this would be appreciated.

Upvotes: 0

Views: 410

Answers (1)

Cukic0d
Cukic0d

Reputation: 5421

The /16 in your addresses is called a netmask in CIDR notation. It means that your adresses are subnets that include all possible addresses between 169.254.0.0 and 169.254.255.255. (Same for the source IP) See https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing and https://en.wikipedia.org/wiki/Private_network

Scapy is going to send 256x256x256x256 (accounting for both sr and dst) packets with all possible addresses, starting as you saw with the 0.0 ones. You just need to remove the /16.

Upvotes: 1

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