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Re: nmap 3.50 Oddity on FreeBSD 4.9-RELEASE
From: MadHat <madhat () unspecific com>
Date: Tue, 23 Mar 2004 16:35:34 -0600

On Mar 23, 2004, at 3:06 AM, Weiersmüller Mathias (KPFN 1) wrote:
Is the network 10.51.55.0/25 directly connected, or is a entry in the routing table which has the address 10.51.55.0 as "first address" within the network? So this address is a "network number", and I suppose that FreeBSD 4.9 does not want to send packets towards the network number.

What happens when trying to ping or open a telnet towards 10.51.55.0?


This is what I have been trying to test, on my local networks. Trying to see if I can get it to generate those errors when there is no route to host, but have not been successful in reproducing the issue when testing on Linux, OSX or BSD as of yet.


Just my 5 cents...

Mathias Weiersmueller




On Mar 20, 2004, at 12:24 AM, eric wrote:
Thinking that I'd get around the following problem, I switched my
attack host from OpenBSD to FreeBSD. However, when using the
following attack method...

sudo nmap -sS -p '1-65535' -g 53 -oG foo.gnmap  -T 4 -iL foo.list

I get the following..

sendto in send_ip_raw: sendto(6, packet, 28, 0, 10.51.55.0, 16) =>
Can't assign requested address
Sleeping 15 seconds then retrying

foo.list contains the following

$ cat foo.list
10.51.55.0/25
172.16.0.0/18

etc..

This is on FreeBSD 4.9-RELEASE with all current patches and a
GENERIC kernel. If there's any more information you need, please let
me know. Note: doing a SYN scan against hosts doesn't cause this
problem, only using an input list.

I am using a freebsd box to do a lot of scanning.  I seem to
remember a
problem depending on the security, where it would start blocking
packets after a certain threshold and I had to make some
changes to get
it to work.  I am not a bsd expert, and have not looked at in
a while,
so I can't remember what it was but I will see if I can find it.


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