Gluster users - Feb 2013 - Isolating Gluster volumes with a firewall (amazon security groups)

Hi All,

I am looking to utilize gluster on amazon aws for shared storage among
web servers (Elastic Beanstalk).  However, since I plan on using the
gluster tier for numerous different beanstalk environments, I'd like
to isolate the systems from accessing each others data.  Since
Beanstalk uses dynamic IP addresses, I can't utilize the built in
auth.allow and auth.reject in gluster to isolate volumes.  Is it
acceptable to firewall (utilizing security groups in amazon) the
underlying bricks (24009+) to prevent cross volume access?

Thanks in advance,

Al