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RE: Discovering network subnets
From: "Payton, Zack" <Zack.Payton () MWAA com>
Date: Sat, 20 Aug 2005 18:35:27 -0400

Most likely it's not a /24 but some kind of larger network like a /23
for example.

For example:
10.0.0.0/23 ranges from 10.0.0.0 - 10.0.1.255 making 10.0.1.0 a
completely valid address.

As far as figuring out the topology map where are you in relation to the
network?
If you're on the broadcast domain use DHCP or a sniffer to listen for
broadcast packets.
If not... See if you can query network devices using SNMP... It's pretty
trivial to figure out packet signatures for cisco and Juniper routers
and then brute force SNMP.  Using DHCP relay sometimes works.  ICMP
Address mask requests if they're not behind a firewall which they don't
appear to be if X windows is exposed to the internet.   If it's not a
private network just use traceroute.orgs route servers.... If you're in
the same AS it may be possible to for a routing adjacency with the IGP
using FX's virtual router attack kit...

Who knows?
Z
 

-----Original Message-----
From: hannibal blog [mailto:hannibalsec () gmail com] 
Sent: Saturday, August 20, 2005 7:07 AM
To: pen-test () securityfocus com
Subject: Discovering network subnets

hello list

I'm actually doing a blackbox audit of a network, and I'm trying to
discover network architecture.

I got this output with nmap X.X.X.0/24

interresting ports on X.X.X.0
68/tcp
723/tcp
6000/tcp

I'm not sure the network is a C class one, but I'm surprised that such
an ip adress is an host IP.
What do u think ?
Any idea to guess network adressing map ?

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