Nmap Development mailing list archives
Re: Why does nmap send multiple probes to the same port?
From: Andreas Ericsson <ae () op5 se>
Date: Thu, 12 Jan 2006 01:56:04 +0100
chok () chokmah org wrote:
I am having trouble with nmap sending multiple probes to the same port to the same target. Because of this, a scan of all ports takes many days instead of an hour or two. I am using nmap version 3.81 on debian 3.1 (sarge). Here is what the scan looks like: # nmap -sT -P0 -p 1-65535 --packet_trace 192.0.2.1 Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) at 2006-01-06 09:47 CST CONN (0.3610s) TCP localhost > 192.0.2.1:21 => Operation now in progress
It doesn't. EINPROGRESS (the macro for the error-code being returned) is returned, but that doesn't mean nmap is sending the packet. Here's what the connect(2) man-page has to say about it; ---8<---8<---8<---8<--- The socket is non-blocking and the connection cannot be completed immediately. It is possible to select(2) or poll(2) for completion by selecting the socket for writing. After select indicates writability, use getsockopt(2) to read the SO_ERROR option at level SOL_SOCKET to determine whether connect completed successfully (SO_ERROR is zero) or unsuccessfully (SO_ERROR is one of the usual error codes listed here, explaining the reason for the failure). ----------------------- -- Andreas Ericsson andreas.ericsson () op5 se OP5 AB www.op5.se Tel: +46 8-230225 Fax: +46 8-230231 _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev
Current thread:
- Why does nmap send multiple probes to the same port? chok (Jan 11)
- Re: Why does nmap send multiple probes to the same port? Andreas Ericsson (Jan 11)
- Re: Why does nmap send multiple probes to the same port? Casey Williams (Jan 11)
- Re: Why does nmap send multiple probes to the same port? Andreas Ericsson (Jan 11)
- Re: Why does nmap send multiple probes to the same port? Casey Williams (Jan 11)
- Re: Why does nmap send multiple probes to the same port? Richard van den Berg (Jan 12)
- Re: Why does nmap send multiple probes to the same port? Andreas Ericsson (Jan 12)
- Re: Why does nmap send multiple probes to the same port? Casey Williams (Jan 11)
- Re: Why does nmap send multiple probes to the same port? Andreas Ericsson (Jan 11)
- <Possible follow-ups>
- RE: Why does nmap send multiple probes to the same port? chok (Jan 12)