Ftp with natd is slow

[Hugo Leonardo Haas]

Hi,

I install the Natd in may Internet gateway to access Internet and the 
Internet access my ftp server into my network.

I do the steps at the  
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/network-natd.html

It functioned, but with out performance.

To information: In my internal network the FTP functioned perfectly (is a 
Linux Enterprise WS Server).

My file /etc/natd.conf is:

-redirect_port tcp 192.168.1.1:20 20
-redirect_port tcp 192.168.1.1:21 21


My inicialization command is: /sbin/natd -s -interface xl0 -config 
/etc/natd.conf


My ipfw configuration file is:

/sbin/ipfw add 0001 divert 8668 all from 192.168.1.0/24 to any via xl0 out
/sbin/ipfw add 0002 divert 8668 all from any to 200.x.x.x via xl0 in


Any body was correct this problem, please help me.

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