Re: Filtered Port

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

Robby Workman wrote:
> 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>
> 
> 
> <apology>Rob, sorry for sending this to you first - I always forget to
> fix that...</apology>
> 
> If it still doesn't work, it's quite possible that your ISP is filtering 
>  that port upstream of you.
> 
> RW
> 

But I get on the server itself and do an nmap from itself, and it shows 
that it is filtered.  If the ISP was filtering, would NMAP still show that?

-- 
Scott Mayo
Technology Coordinator
Bloomfield Schools
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