Sending packets with Scapy within Python environment

Question

I am playing around with Scapy and I want to use it within a Python script but sending packets seem to be a problem. Here is my code.

Scapy Shell:

send(IP(src="10.0.99.100",dst="10.1.99.100")/ICMP()/"Hello World")

This works fine and sends the packet.

Python script:

#! /usr/bin/env python

from scapy.all import sr1,IP,ICMP

p=sr1(IP(src="10.0.99.100",dst="10.1.99.100")/ICMP()/"Hello World")

This runs fine but when it tries to send the packet I get:

WARNING: No route found for IPv6 destination :: (no default route?)
Begin emission:
.Finished to send 1 packets.
....^C
Received 5 packets, got 0 answers, remaining 1 packets

What exactly is your question? It looks to me like everything is working fine. — RyPeck
– RyPeck, Commented Jul 31, 2013 at 20:06
In the scapy environment I get a output of "Sent 1 packets" and it works but with python it just starts receiving packets and not sending it — Evan Clark
– Evan Clark, Commented Jul 31, 2013 at 21:40

Kęstutis · Accepted Answer · 2025-09-16 20:28:05Z

18

When you run this in the Python environment you are using the sr1 function. The sr1 function will send a packet and then wait for an answer, keeping a count of received packets. See more here -

https://scapy.readthedocs.io/en/latest/usage.html#send-and-receive-packets-sr

To get the behavior you desire, you need to use the send function, just like you did when using the Scapy shell.

#! /usr/bin/env python

from scapy.all import send, IP, ICMP

send(IP(src="10.0.99.100",dst="10.1.99.100")/ICMP()/"Hello World")

edited Sep 16 at 20:28

Kęstutis

1191 silver badge8 bronze badges

answered Jul 31, 2013 at 22:54

RyPeck

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