trafshow or analog under Solaris

Hello.

I try to build from source trafshow, but it show nothing - black screen without any activities. Also i try to use opencsw trafshow - it's not running:

# /opt/csw/bin/trafshow -a 32 -i net0
net0: net0: /dev/net: Is a directory
No packet capture device available (no permission?)

So, is any method to use trafshow or use analog to watch realtime network traffic.

Thanks.