Custom IP protocol with ACK

Question

I would like to explorer the possibilites of creating a custom IP procotol. Perhaps with scapy in Python.

I've got a tunnel where I receive all packet s, so would like to see if I can dismiss destination IP, ports etc. and keep an absolut minimum - but with ACK .

Anyway this is possible with scapy or similar?

I've tried some simple stuff like:

p = IP(dst="192.168.0.2")/"My payload"

But it seems not doable in that manner.

Answer 1

What are you trying to achieve? Forgoing transport layer port numbers limits communication to a single process on each node.

You'll need to register a protocol (number) with the IP stack to make it pass everything with that protocol to your handler. Most often, it's much easier to use UDP transport and build your own stuff on top. You can also simply number your UDP datagrams and ACK them on the application level.