Security Basics mailing list archives
nmap questions
From: "Steven A. Fletcher" <sfletcher () integrityts com>
Date: Fri, 4 Jun 2004 00:34:19 -0500
I'm not sure if this is the right place to ask this or not, but I thought I would give it a try. I have run into an interesting problem when trying to UDP port scans with nmap. TCP SYN scans work fine, but if I try doing a UDP scan, it comes back with "Too many drops ... increasing senddelay" numerous times in a row. It does seem that if I leave the scan running long enough, it eventually completes the scan. On a very small network, this is not a problem. However, on larger networks, I do not wish to wait that long. Also, it happens on an internal network, so the problem does not appear to be that the hosts are behind a firewall. I have been trying to do what I can to have the scan finish in a fairly reasonable amount of time, so I was hoping to improve the performance, if possible. A Google search returned nothing helpful, so that is why I am trying here. Just in case it is needed, here is the command line I am using: nmap -sS -sU -O -v -oA test -T3 -F --min_parallelism 100 192.168.1.0/24 Also, the machine is running MandrakeLinux 9.2 and kernel version 2.4.26. Any help is greatly appreciated. Steve Fletcher Senior Network Engineer, MCSE, Master ASE, CCNA Integrity Technology Solutions Phone: (309)664-8129 Toll Free: (888) 764-8100 ext. 129 Fax: (309) 662-6421 sfletcher () integrityts com --------------------------------------------------------------------------- Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off any course! All of our class sizes are guaranteed to be 10 students or less to facilitate one-on-one interaction with one of our expert instructors. Attend a course taught by an expert instructor with years of in-the-field pen testing experience in our state of the art hacking lab. Master the skills of an Ethical Hacker to better assess the security of your organization. Visit us at: http://www.infosecinstitute.com/courses/ethical_hacking_training.html ----------------------------------------------------------------------------
Current thread:
- nmap questions Steven A. Fletcher (Jun 04)
- Re: nmap questions Brad Arlt (Jun 05)
- Re: nmap questions Pho Man (Jun 07)