What's the latest version of ip_filter to work with Solaris 2.6?

This is what I've done to completely disconnect myself from the 'net.

I tried upgrading to the newest ip_filter (4.1). Then when it gave me
atomic_something errors, I tried to delpkg both pfil and ipf and install
the latest version of ipf3 (3.4.24?) that I had. I get a kernel fault now.

I'm guessing I have two "bad" version of ip_filter for my system.

Anyone know the latest version working with Solaris 2.6? I'm running a
SPARCclassic with a be card.

Thanks.

Todd