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Hi,

Never posted here before, so hope I do it correctly. I am working with the
Trinity OS firewall rule set 3.81. Excellent. A firewall book (ISBN
1-56592-871-7) suggests a perimeter network for better security from attacks
on web and mail servers and for stronger protection internal network from
hacked web or mail servers.

A small network (DMZ?) placed in front of internal firewall is, mostly,
protected by outer firewall except for port forwarding through to web and mail
servers. Is it possible to place a network between 2 masked machines?

For example:
Internal mask machine protects internal network and allows no port forwarding
backwards through it. Internal address is 192.168.0.1. Address on perimeter
network is 172.16.0.5.
Web server, mail server, etc are located on 172.16.0.0 perimeter network.
External mask machine protects perimeter network and internal network but
allows port forwarding to perimeter network (172.16.0.0) back to web and mail
servers from Internet. Perimeter network address is 172.16.0.1 and public
address is 123.123.123.123.

Thank you, in advance, for your help.

Mark
Mark's Communications Support, Inc.

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