split dns & cisco pix firewall

[colm ennis]

I currently have 2 bind processes living on one internal dns server. One process
serves our real namespace to internal hosts, the other serves a shadow namespace 
to the internet. I was thinking of having just one bind process serving internal 
and external requests. Cisco pix "alias"'s, "static"'s and "conduit"'s would provide
the internet with access to those hosts we want to expose. DNS requests replies 
travelling out to the internet via the pix would have their result field rewritten 
as mentioned in the "alias" command reference :
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_v44/pix44cfg/pix44cmd.htm#xtocid266783

Is this feasable and/or recommended?

thanx,

colm ennis