how to set wu.ftpd refuse connection if no reverse DNS lookup??

how to set wu.ftpd refuse connection if no reverse DNS lookup??

Post by Lars Hofhan » Wed, 27 Sep 1995 04:00:00


>As title. Any hint? TIA.


>Li On

Use the tcpd wrapper daemon.

It has an option to guard against ip-spoofing and the like.
It's good idea to use it anyway, since you get log-messages
whenever someone connects, and you can disable services (ftp,
telnet, rlogin, etc.) selectively.



1. Why does wu-ftpd try to do DNS reverse lookup?

I have wu-ftpd running on my RedHat 7.1 linux box.  However, I have
noticed that it ALWAYS tries to do a reverse DNS lookup on the client's
IP Address.  Why does it do that?  Is it to print the hostname on a log?
Is there a way to turn this off?  It adds a really annoying connection delay
when the reverse lookup fails!


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