Re: Filtered Port

[Scott Mayo <sgmayo@mail.bloomfield.k12.mo.us>]

Rob Sterenborg wrote:
> On Tue, January 31, 2006 14:55, Scott Mayo wrote:
> 
>>I am not sure if this is my iptables or not, but I am not sure where
>>else to look or ask.  I am trying to use Remote Desktop on a
>>computer.  From inside my network, it works fine, but once I get
>>outside, I cannot use it.  I have set my IPTABLES to forward anything
>>going to port 3389 to the computer that is using Remote Desktop.
>>
>>The problems seems to be that port 3389 is filtered.  I can find
>>nothing in my iptables where I have this port filtered.  Are there
>>some generic ports, that IPTABLES filters on it own or something?  If
>>the IPTABLES are not filtering it, what else could be?
> 
> 
> You allow forwarding to this host but you also need to DNAT these
> packets from the internet IP to the IP of your computer.
> 
> $ipt -t nat -A PREROUTING -i <if_inet> -d <ip_inet> \
>   -p tcp --dport 3389 -j DNAT --to <ip_controlled_host>
> 

Maybe I used the wrong word when I said 'forward'.  This is the rule 
that I have in place and it does not seem to be working.  I assumed that 
it was because the port is filtered, or that is what NMAP tells me when 
I run it.

I still have no idea why port 3389 is shown as being filtered.  I have 
no rules in my iptables that explicitly filter it.

-- 
Scott Mayo
Technology Coordinator
Bloomfield Schools
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