Nmap Development: Transient error with sendto in send_ip_packet

[Brandon Enright <bmenrigh () ucsd edu>]

On one of my scanning machines I periodically get

sendto in send_ip_packet: sendto(9, packet, 44, 0, w.x.y.z, 16) =>
Operation not permitted

And I have been unable to track down the source of the error.  I know
strict iptables rules can sometimes not permit certain packets but this
error occurs with and without any iptables rules.  Any insight into what
could be causing the problem would be much appreciated.

Here is some information that may be needed:

$ nmap --version
Nmap version 4.11 ( http://www.insecure.org/nmap/ )

$ uname -a
Linux burninator 2.6.17-gentoo-r5 #1 SMP PREEMPT Thu Aug 17 21:06:35 UTC
2006 x86_64 Intel(R) Xeon(TM) CPU 3.40GHz GNU/Linux

$ gcc --version
gcc (GCC) 3.4.6 (Gentoo Hardened 3.4.6-r1, ssp-3.4.5-1.0, pie-8.7.9)

CFLAGS="-O2 -march=nocona -pipe"


Here is an example of a scan that generates these errors.  The issue is
*not* related to "-P0".

# nmap -P0 -A -v -p- -T4 --min-parallelism 96 --min-hostgroup 128
<several thousand ips>

Please let me know if there is anything else I can provide.

Brandon


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