Re: nmap Discover others question

On 2013-09-23 ToddAndMargo wrote:
> On 09/23/2013 02:42 AM, Ansgar Wiechers wrote:
>> On 2013-09-22 ToddAndMargo wrote:
>>> If they are connected though a "route" command, would they not show
>>> up anyway?
>>
>> That question doesn't make any sense. The "route" command sets or
>> displays routes, i.e. next-hop destinations for packets. It doesn't
>> "connect" anything.
> 
> I think I was not clear in how I asked the question. This is the
> "route" command I am speaking of.  And, it "does" connect two
> different network together. Note the "ADD" command in the example.
> 
>    1) open a DOS prompt in Windows:

It's a command prompt, not a "DOS prompt". CMD.EXE doesn't have anything
to do with DOS.

>    2) enter "route /?"
>       Manipulates network routing tables.
>       ROUTE [-f] [-p] [command [destination]
>          [MASK netmask]  [gateway] [METRIC metric]  [IF interface]
>       ...
>       Examples:
>          > route ADD 157.0.0.0 MASK 255.0.0.0  157.55.80.1 METRIC 3 IF 2
>              destination^      ^mask      ^gateway     metric^    ^
>                                                          Interface^

I'm well aware of the syntax of the "route" command shipped with
Windows as well as what it actually does, thank you very much.

Your example command defines that packets with a destination address
in the network range 157.0.0.0/8 should be passed via interface 2 to a
next hop (or "gateway") with the address 157.55.80.1. However, if the
host where you defined that route cannot (directly) reach the gateway
(or the gateway cannot forward the packets for some reason), the remote
network will be unreachable. IOW if they aren't already connected,
setting a route won't change anything about that.

> So, if someone on a different network is using the "route" command
> to connect to your network, will they show up?

There is no simple answer to that question. Too many factors could
influence the outcome (physical connectivity, routing tables on
intermediate routers, packet filters, etc.).

Regards
Ansgar Wiechers
-- 
"All vulnerabilities deserve a public fear period prior to patches
becoming available."
--Jason Coombs on Bugtraq

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