Re: Discovering hosts behind NAT

[Wolfgang Zenker <wolfgang () jpaves de>]

Franklin DeMatto wrote:
> How can hosts which are using RFC 1918 non-routed ip's be discovered and contacted?

> Scenario:

> A DNS Zone transfer, as well as usenet searches, indicate usage of RFC 1918 addresses for a certain domain name 
> (let's call it internal.company.com).
> [..]
> There are two known network devices: a cisco, which seems totally silent, and a wellfleet router.

You could try to use "IP Source Routing" to contact internal hosts on the
destination network. Some versions of ping allow you to set the source route
option in your pakets using the "-g" option, you would use the outside
router of the destination network as gateway and if that does not work, try
to add a dmz host as second gateway.

Wolfgang

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Wolfgang Zenker                                  Mail: W.Zenker () jpaves de
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