sniffer - How to sniff / monitor SVN protocol messages? (or any TCP messages from an application) -

i monitor incomming svn protocol requests / repsonses svn server (1.6, using collabnet edge 1.3.1). or option, monitor svn trafic comming client (.net app)

i don't mind writing code it, i'm sure there should straight forward way this

if using apache webdav frontend subversion; can view apache access logs.