How does one provide custom payload without explicitly providing offset ? FlowCustom has some limitations. about models HOT 2 CLOSED

Custom is just that - a custom packet header that consists of x number of bytes.
It gets inserted into the packet based on its location and it can be inserted multiple times.
So you can have packet=[Ethernet(), Vlan(), Custom(bytes='...'), Tcp(), Custom(bytes='...')]
The bit pattern offsets are only specific to the containing Custom packet header.
This allows the packet blaster / negative testers to generate whatever they want.

from models.

Then how does one provide custom payload without having to explicitly provide payload offset ? (it's a pretty common use case in most traffic generators, including Ixia and Scapy)

Maybe a new schema for that is in works ? If not, I would propose to explore options to reuse Custom.

from models.