traffic, rpc.etherd, and nit open: problem

[Astw]

I'm trying to use "traffic" on my SS1+ running SUNOS 4.1.  When, as root,
I type "rpc.etherd le0" I get "nit open: No such device" I did a "netstat
-i" to get the interface, le0.  I presume that an "open( "/dev/nit",  )"
is occuring. Yes/No?  There is a /dev/nit by the way.  What's wrong?  If
it is the proper etiquette for this newsgroup, email and I will summarize.