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RE: nmap 3.50 Oddity on FreeBSD 4.9-RELEASE
From: Weiersmüller Mathias (KPFN 1) <mathias.weiersmueller () credit-suisse com>
Date: Tue, 23 Mar 2004 10:06:52 +0100

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?

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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