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From: Charles Swiger <cswiger@mac.com>
Date: Wed, 7 Jul 2004 15:46:18 -0400
To: David Gilbert <dgilbert@dclg.ca>
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cc: freebsd-security@freebsd.org
cc: Zoran Kolic <kolicz@eunet.yu>
Subject: Re: nmap not scanning networks?
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On Jun 18, 2004, at 10:54 AM, David Gilbert wrote:
> Zoran> Have you tried without "'"?  Or 172.19.17.1-254?  Nmap works
> Zoran> for me. Maybe port 21?
>
> I've noticed that nmap on FreeBSD is particularly lame at scanning the
> local network.  If the majority of the addresses on the local network
> are unoccupied, then it will pause with a 'no buffer space available'
> message and pause for 15 or 20 seconds each.

I believe Oliver (the port's maintainter) looked into this issue and 
found a fix, try updating to the latest nmap port and see whether it 
does better now...

-- 
-Chuck