full-disclosure - ICMP Covert channels question

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From: andfarm at teknovis.com (Andrew Farmer)
Subject: ICMP Covert channels question

On 28 Jan 2005, at 14:45, cyberpixl wrote:
<snip>
> Assume there is a local machine (our target) with ip 192.168.0.2 that
> is connected to the internet using a router 192.168.0.1/88.88.88.88
> (that is not blocking icmp packets) and my machine is say,
> 33.33.33.33. If i then send an icmp packet to the 88.88.88.88 router
> with source ip set to 192.168.0.2, would it forward that packet to the
> host in its local network, or will it discard it?

Depends entirely on the router's configuration. Most will forward it;
however, some will, whether out of misimplementation or paranoia,
drop it.

> Is there any way to deliver my packet to that local machine?

There are some other nifty tricks you ought to check out. For example,
take a look at LimeWire's 'UDPConnect' protocol.
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