Craft an IP in IP example with scapy

0
votes

I am trying to send an IP in IP packet with scapy but I seem to be missing or misunderstanding something. Here is my attempt:

from scapy.all import *

payload = "HelloWorld" 
inner = IP(dst="192.168.1.2")
inner.add_payload(payload)
outer = IP(dst="192.168.1.2")
send(outer/inner)

I watched for the packet with wireshark on the destination and it showed that the packet was malformed:

Expert Info (Error/Protocol): IPv6 Hop-by-Hop extension header must appear immediately after IPv6 header

the destination then sends an ICMP packet back with type 3 (destination unreachable) and code 2 (Protocol unreachable).

I have tried setting several protocols on the outer and inner packets (protocol 4 IPv4 encapsulation feels right) but so far they all send back a "protocol unreachable" ICMP packet.

If it makes a difference my intent is to have the inner packet get sent to a different destination than the outer packet. I just thought I should make the simplest possible example to get started. Once I figure out why I am getting a protocol unreachable message I will change the inner packets destination IP.

Suggestions?

1
pythonnetworkingscapy

1 Answers

1
votes

If you want to send an IP in IP packet (Outer IP header, Inner IP header, IP payload), e.g.:

from scapy.all import *

payload = "TEST"
send(IP(dst="192.168.1.2")/IP(dst="192.168.1.2")/UDP(dport=4444)/payload)