title: Modify a PCAP file using Perl with checksum update
body: <p>I have some 250MB pcap. I have able to change MAC and IP address' using tcpreplay but I also need to modify some fields inside the packet payload. If I change the field by reading as a binary the checksum of the ip payload will fail. Is there a module that will allow me to modify certain fields and the checksum will be updated?</p>