nmap problem?

[bigmacbb63]

Here is the problem:

Starting Nmap 4.52 ( http://insecure.org ) at 2008-01-15 21:59 PST
Initiating Parallel DNS resolution of 4096 hosts. at 21:59

I even updated nmap to Nmap 4.53 and it still freezes.


It won't go beyond that??? I can't figure out why?
Can someone help me - thanks.

bigmac

[HughA]

Hello bigmacbb63,

nmap is probably taking a long time to perform DNS resolution, or perhaps timing out on hosts for which it cannot perform such resolution. Try running nmap with the '-n' option - see the text below, which was pasted from the nmap man page:

-n (No DNS resolution)
Tells Nmap to never do reverse DNS resolution on the active IP addresses it finds. Since DNS
can be slow even with Nmap’s built-in parallel stub resolver, this option can slash scanning
times.

Regards,
Hugh

[blitzo]

How long have you left it in a frozen state?

[sej7278]

what flags did you start it with?

try: nmap -sT -p- -P0 localhost

you really have to be root too

i've had no problems with 64-bit fedora7 and nmap 4.20, 4.23rc2 and 4.53 (zenmap is horrible!)

[bigmacbb63]

Even as root with the -N option is doesn't work and freezes for hours.
It doesn't matter what I do it doesn't work!!!
this worked but only on the localhost - nmap -sT -p- -P0 localhost


bigmac

[bigmacbb63]

Does anybody have any other ideas? It should work?
this doesn't work - nmap -v -iR 10000 -PN -p 80 and this doesn't work nmap -v -iR 10000 -P0 -p 80

I am welcome to any ideas. Oh, by the way deleting it and re-installing doesn't work either just to let you know?

bigmac

[Chessherm]

Try using the "-vv" (very verbose) option. More output information may help point out the source of the problem.

Also try using the "-e" (specify interface) option.