Consult the documentation for the firewalls and NAT devices used at your site to determine how to
set up those devices appropriately for FTP transfers. See the next section for how to configure an
Equalizer cluster for responding to FTP requests from clients.
FTP Cluster Configuration
When configuring an FTP cluster on Equalizer, the following guidelines must be followed:
l
The
protocol
for the cluster must be
Layer 4 TCP.
l
The
start port
parameter for the cluster must be set to port
21
. (Note that port 20 is also
used, but you do not specify it when adding the cluster.)
l
The
spoof
flag must be enabled for the cluster.
FTP data connections are automatically configured (internally) with a
sticky time
of one second.
This is necessary to support the passive mode FTP data connection that most web browsers use.
This means that there will be one sticky record kept for each FTP data connection. For an
explanation of sticky records, see
l
FTP clusters occupy two internal virtual cluster slots, even though only one appears in the
interface. This permits Equalizer’s NAT subsystem to rewrite server-originated FTP data con-
nections as they are forwarded to the external network.
l
You cannot enable the
direct server return
option on an FTP cluster.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
381
Equalizer Administration Guide
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