virual domain problems.

[naveen]

hi,
I have configured the DNS server which will direct all the virtual hosts of
my domain to my web server.
  The problem  is , when I am using virtual host to access my server, I
loose all my session variables when I pass from one page to another.
Should I configure virtual host parameter in tomcat also.
I am using Tomcat and apache on Redhat machine.
thanks