McAfee WebShield e500 Installation Manual page 59

Installation Guide — English
Routing protocols through the appliance
Consult the documentation that accompanies your other equipment for
detailed information on configuring the required options. When you have
finished configuring the equipment, you can perform versions of the test on
page 50 to ensure that your mail setup is correct. The appliance uses the
following default ports for the protocols:
• E-mail (SMTP): 25
• File transfer (FTP): 21
• Web browsing (HTTP): 80
• Mail download (POP3): 110
If you have configured the appliance to use different ports for the protocols,
you must adjust your other equipment to use those ports accordingly.
We also recommend that you configure your firewall to only send and receive
internal traffic from the appliance (for the protocols proxied by the appliance).
Modifying DNS server records
Depending on your organization's network topology and the protocols that
the appliance proxies, you might need to modify records for internal and
external DNS servers; see the scenarios presented by Chapter 1 of the Product
Guide.
In particular, if you have internal FTP, web or POP3 servers, you might need
to create records for external DNS servers that match the internal FTP, web and
POP3 servers to your firewall. For an internal web server, you also need to
create records for the internal DNS server that match the web server's domain
name to its IP address.
The records that you include at the DNS server (and their order) also
determines whether you are implementing a fail-over, fail-closed or fail-safe
configuration (see Chapter 1 of the Product Guide), so you must ensure that
the records are listed correctly.
For details on modifying your DNS server software, refer to the information
that accompanies it.
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