Nmap Development mailing list archives
Re: Possible error message bug in nmap-4.11 on Gentoo
From: Professor Messer <messer () spamarrest com>
Date: Thu, 12 Oct 2006 10:21:46 -0400
Remember also that if you're scanning a local subnet, the latest Nmap verisons won't perform an ICMP nor a TCP ACK on port 80. For all local subnet "pings" (including the Nmap ping process prior to a scan), nmap uses the much more efficient and effective ARP process to determine local device availability. Since an ARP isn't an IP frame, there shouldn't be a specification of ports when the local subnet is involved exclusively with an -sP option. Perhaps a more refined error message would be in order, and an update to the man page. -- James "Professor" Messer Author, Secrets of Network Cartography: A Comprehensive Guide to Nmap http://www.networkuptime.com/nmap Andreas Ericsson wrote:
Diman Todorov wrote:Well, you *are* telling nmap to do a ping-scan (-sP) which doesn't use ports, but then you specify ports as well.This is not correct. from the nmap man page: <snip> The -sP option sends an ICMP echo request and a TCP packet to port 80 by default. When executed by an unprivileged user, a SYN packet is sent (using a connect() call) to port 80 on the </snip> IMHO -sP should respect -pTouché. I should rtfm more carefully or, as in this case, at all :-) I'm still not sure it makes sense though, unless you use the scan option to control output (i.e. make hosts responding to any of the tcp-ports given in the range show as "up", but nothing else). Oh well. I'm sure it'll all turn out for the best.
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Current thread:
- Possible error message bug in nmap-4.11 on Gentoo Mike Wallette (Oct 11)
- Re: Possible error message bug in nmap-4.11 on Gentoo Hari Sekhon (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo AgentSmith15 (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo Daniel Rozsnyó (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo Andreas Ericsson (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo Diman Todorov (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo Andreas Ericsson (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo Professor Messer (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo AgentSmith15 (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo Hari Sekhon (Oct 12)
- RE: Possible error message bug in nmap-4.11 on Gentoo Ulises Cuñé (Oct 12)
- <Possible follow-ups>
- Re: Possible error message bug in nmap-4.11 on Gentoo Marcin Wielgoszewski (Oct 12)
- RE: Possible error message bug in nmap-4.11 on Gentoo Thomas Buchanan (Oct 12)
- RE: Possible error message bug in nmap-4.11 on Gentoo Thomas Buchanan (Oct 12)
- Re: Possible error message bug in nmap-4.11 on Gentoo Fyodor (Oct 12)