verify RSA 2048

I am using OpenSSH version 4.3p2.  I was wondering how I could verify
that the data going from one computer to another over the internet is
using RSA 2048.  I set both of the keys on each machine to that bit
strength.  Is there a tool out there that I can you that could verify
that the information is being sent at 2048 or is even being encrypted?

Thanks,

--
Dustin