In a large corporate environment with multiple sites there are multiple DNS 
servers.  Inside and outside.  Do to many sites and many administrators not 
all clients access the internal DNS servers for name lookups.  Some will 
access the external servers and some will even access random servers on the 
internet.

Currently Cisco Pix firewalls are being used.  To alleviate the DNS problems 
Cisco has the alias command.

alias (inside) x.x.x.x y.y.y.y 255.255.255.255

There is one of these commands for every server in the DMZ.

Now there is a move to change to Firewall-1.  Is there a way to do this in 
Firewall-1?

No, I can not fix the DNS.

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