af_packet: IPS and defrag
defrag is not compatible with IPS mode as reconstructed packets will be too big when sent over the wire. So we need to warn the user about that. But when defrag is disabled, the cluster_flow load balancing will not work correctly so we need to propose an alternative configuration to improve things.
#1 Updated by Victor Julien about 2 years ago
I think currently safe scenarios are:
workers mode with 1 thread per interface, af-packet defrag disabled
autofp mode with 1 thread per interface, af-packet defrag disabled
If the network is guaranteed to be free of fragmentation (e.g. firewall policy blocks it), multiple threads per interface can be used.