VERY annoying nmap problem.

Dru dlavigne6 at cogeco.ca
Sat Mar 29 07:12:41 PST 2003



On Sat, 29 Mar 2003, jason wrote:

> This has been going on since version 3.0 of nmap for freebsd..
>
> su-2.05b# uname -a
> FreeBSD monsterjam.org 4.8-RC FreeBSD 4.8-RC #0: Mon Mar 10 16:54:44
>
> su-2.05b# nmap -sU 10.1.1.10
>
> Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
> sendto in send_udp_raw: sendto(3, packet, 28, 0, 10.1.1.10, 16) =>
> Permission denied
> Sleeping 15 seconds then retrying
> ^Ccaught SIGINT signal, cleaning up
> su-2.05b#
>
> this is nmap installed from the ports. I have tried it from source and get
> the same thing. regular port scans work though
>
> su-2.05b# nmap  10.1.1.10
>
> Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
> Interesting ports on bush (10.1.1.10):
> (The 1595 ports scanned but not shown below are in state: closed)
> Port       State       Service
> 22/tcp     open        ssh
> 111/tcp    open        sunrpc
> 139/tcp    open        netbios-ssn
> 631/tcp    open        ipp
> 6000/tcp   open        X11
> 32771/tcp  open        sometimes-rpc5
>
> Nmap run completed -- 1 IP address (1 host up) scanned in 1 second
> su-2.05b#
>
> I emailed fydor a few times and got no help.
> anyone have any ideas? This used to work fine before 3.0


What firewall are you using and what rules have you created for UDP?
Using -sU (UDP scan) sends UDP packets. Whereas not specifying a switch
assumes a full connect scan which uses TCP.

Dru


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