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Date:      Mon, 29 Nov 1999 13:37:13 +0200
From:      Sheldon Hearn <sheldonh@uunet.co.za>
To:        mideyon <leoric@fastlane.net>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: nmap question 
Message-ID:  <28381.943875433@axl.noc.iafrica.com>
In-Reply-To: Your message of "Sat, 27 Nov 1999 00:50:53 CST." <383F7F4A.7610AE6C@fastlane.net> 

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On Sat, 27 Nov 1999 00:50:53 CST, mideyon wrote:

>  sendto in send_tcp_raw: sendto(3, packet, 40, 0, x.x.x.x, 16) => No
> buffer space available
> Sleeping 15 seconds then retrying
> 
> it keeps doing this

What release of FreeBSD are you using?  Try watching mbuf utilization
while you're running nmap, ideally in another xterm or on another
console.  You can do this with:

	while true; do netstat -m ; sleep 1 ; done

Once you have a screen's worth of data, watching the output should get
easier on the eyes. :-)

Particularly, watch the "mbufs in use" ratio.  If you notice it
approaching 100% utilization, you may want to consider running a kernel
compiled with a higher maxusers (or NMBCLUSTERS).

I'm not sure that this has anything at all to do with our problem, but
it's worth a shot to try in the meantime while you're waiting for more
clueful responses.

Ciao,
Sheldon.


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