NIT STREAMS in SunOS 4.1 useful for protocol development?

[Ken Schroder]

We're planning to do some protocol experimentation over the summer.
This work will require tapping selected messages from the incoming IP
traffic, and injecting messages into the outgoing traffic.  From the
documentation in 4.0.3 it looks like STREAMS is the way to go.  Just
write our software as a STREAMS module and push it onto a NIT STREAM.

Are TCP/IP, NIT and STREAMS really integrated on SunOS 4.1? I've
heard that as of 4.0.3 there was still some work left to be done.
Something like NIT uses STREAMS on the upstream side, but is hooked
into the Ethernet driver and does not work with any other network
drivers.  I'm interested in hearing about this or any known problems
and limitations in 4.0.3 or 4.1.

Also, has anyone measured the performance (messages/sec, bytes/sec)
through the NIT interface for 4.0.3 or 4.1 on the Sun 4?

Thank you,
Ken
schroder at bbn.com
617-873-3167