From: Meier Zwei (meier_zwei@gmx.net)
Date: Wed Apr 19 2006 - 08:26:02 EDT
Hi list,
while scanning somes hosts I figured out that a scanned packet filter
sending back icmp destination-unreachable rather slow forces nmap to
slow down scanning. A packet filter just dropping the scan probes has no
effect on nmap, so does a host without any packet filter, just sending RST.
My problem is: filtering out the icmp answers with iptables doesn't
work, as nmap seems to hook into the kernel before iptable does. Is
there any to tell nmap to ignore icmp replies and just to determine a
port status via TCP/UDP?
Thanks in advance
Meier
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