Jeffrey L Bromberger wrote:
>So, how should I go about setting up the DNS? The world needs to see
>a wildcard MX record for everyone in the domain (and have it point to
>the gateway). But the machine should also have the correct data to
>pass it on to the internal network. We don't want our internal IP
>numbers advertised outside; routers will make sure that external
>packets make it to the inside just in case.
>Any info you could give would be greatly appreciated! Sendmail.cf
>files for both the gateway and representative internal host would put
>you on my "I owe you" list :-)
I personally recommend picking up a copy of the tutorial notes from
last Summer's Usenix tutorial on "Achieving Security in the Internet
Environment." It has lots of info on DNS and sendmail configurations
to hide the topology of an internal net. As well as good "how to" on
a variety of other firewall topics.
I believe you can order the notes directly from usenix. Try sending
mail to usenix @
org for more info.
-- William McVey
Purdue University Computing Center