john doe

I have a fedora box which is being used as a
firewall/nat/router/virus/mail/dns/mimedefang server. I would like to use
the fedora box for box internal and external DNS hosting. In the past we
used a single win2k server which did active directory and did both internal
and external resolving. Thing is though a cisco router did the routing and
would automatically change anything (not just source/destination) inside the
packet which contained our private address over to the proper external
public address. In other words a internal client could request a MX record
for our domain and get the correct 192.168.1.* internal address while a
external client could request the same MX record from the same server as the
internal counterpart and the cisco router would automagically change the A
record for the MX record 192.168.1.* to its public equivalent. Is this
possible with iptables? Can someone point me in the right direction if so?

BTW, I know you can change the source/destination of the packet so you can
static map a public to its natted address and this is not what im talking
about.