From owner-freebsd-questions  Tue Jun 19  9:48:33 2001
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Date: Tue, 19 Jun 2001 11:47:07 -0500
From: Tony Wells <tony@camel.kdsi.net>
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To: Dan Armstrong <dan@beanfield.com>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Urgent help with Reverse Lookups and FTPD
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Do you really need thousands of addresses for your customers?  I'm
making an assumption , but if you're assigning addresses using DHCP, can
you limit the range of addresses assigned to a reasonable amount?  If
you only have say, 100 modems/xdsl/isdn or whatever connections, you
don't need ~64,000 IP's available.  

I would try looking into limiting the addresses assigned, and then using
/etc/hosts or reverse dns to resolve the IP's.  (Unless of course, you
really need all those IP's.)

Dan Armstrong wrote:
> 
> We are a small ISP, and just turned up a new webserver running Free4.3
> 
> Most of our customers live on private (192.168) addresses and I am
> getting slaughtered with phone calls that they cannot ftp into their
> sites, and it is because their ftp programs don't necessarily wait for
> Free's ftpd to timeout doing the reverse lookup, for an address that of
> course does not have any reverse information for it.  If I add their
> IP to the /etc/hosts BOOM they get in instantly.  These thousands of
> addresses are all dynamically assigned, so the hosts file fix is not
> possible on this scale.  Is there a way I can get it to stop? HELP!
> 
> Dan.
> 
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