scapy

I am trying to identify packets with incorrect checksums while using Scapy as a sniffer. I am able to get the original checksum by accessing packet[TCP].chksum I then remove this using del packet[TCP].chksum I would like to do something like if(originalChecksum == recomputedChecksum): # Checksum is valid I understand that using show2() recomputes the checksum, but is there anyway to access this attribute for comparing back to the original? Calling show2() simply displays what the checksum would be, and does not set any of the values in the packet. Thanks for any clarification to make Scapy

Assuming I managed to be in the middle of the communication between a client and a server (let's say that I open up a hotspot and cause the client to connect to the server only through my machine). How can I alter packets that my client sends and receives without interrupting my own communication with other services? There must be a way to route all of the packets the client both sends and is about to receive (before forwarding them to him) through my script. I think that the correct direction of going about accomplishing this is with iptables but not sure exactly what arguments would fit to

I'm just learning python with scapy. I read and use the book "Network Hacks - Intensivkurs - Angriff und Verteidigung mit Python" (German). I would like to try a man in the middle attack by using arp-spoofing. I have My Computer, the victim (my raspberry pi) and the standard gateway. To spoofing, i use a code snippet from the book #!/usr/bin/python import sys import time from scapy.all import sniff, sendp, ARP, Ether if len(sys.argv) < 3: print sys.argv[0] + " <target> <spoof_ip>" sys.exit(0) iface = "wlan1" target_ip = sys.argv[1] fake_ip = sys.argv[2] ethernet = Ether() arp = ARP(pdst=target

I have a UDP connection up and listening on a port (localhost) and I am trying to send a Scapy packet from localhost as well. For some reason, my C code never actually captures the packet, however I can see the packet show up in Wireshark just fine. It's been awhile since I've used sockets, but is there some special socket options I have to set or why would I be able to see the packet in Wireshark just fine but not by the C socket? Note: I was able to successfully catch a packet when I wrote corresponding socket code to send out packets (from localhost) however I am still unable to get the