Rich wrote:
> Hello!
> 
> I've written a port scanner for Android. It works properly when using
> a connection over Wifi, but on the mobile (3G) connection, everything
> reports a false positive.
> 
> Why is this? I don't know very much about the way the mobile data
> network is structured and I'd like to know more. Is my service
> provider meddling with the connections, or have I just done something
> wrong?

I'd flip the question around: are you aware of port scanners that work
on other mobile platforms over their 3G connections, particularly
T-Mobile's? For example, is there a port scanner for Windows Mobile that
works over T-Mobile's 3G?

If this has been done before, just not on Android, then your problems
may be an Android issue.

However, it wouldn't shock me if there's something funky with the way
that 3G is implemented that might confound a port scanner, or something
odd in the way T-Mobile has set up firewalls and routers that might
cause strange results. If that's the case, though, then there might be
information associated with other port scanner projects that might
explain the behavior and document any possible workarounds.

The only port scanner I have much personal experience with is nmap, and
I do not see much one way or the other about using nmap over T-Mobile's 3G.

With luck, you'll get a more definitive response to your query -- I'm
mentioning this as an alternative path of investigation.

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com
Android Training in Sweden -- http://www.sotrium.com/training.php

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