[TriLUG] Road Runner blocking ports?

mark at thefowles.com mark at thefowles.com
Tue Feb 21 09:43:27 EST 2006


If you have router/firewall do you forward FTP requests from the D-Link
(firewall) to the workstation ?  Just a thought...

- Mark

> Whe I got home yesterday I turned on the 'Allow Passive Transfers' option
> in
> the config file, but, I'm still having the same problem.  I am not using a
> 'client' program to connect. Im just going to a command prompt on my $M
> box
> and doing ftp from the command line.
>
> This may be a problem with my d-link firewall-router.  When I enabled the
> virtual server ftp option on the d-link, it only opened port 21.  In fact,
> it showed 'Private Port 21 - Public Port 21'.   I another rule for 20 but
> no
> luck.
>
> I looked at the d-link help for their virtual server feature but it kept
> referring me to works by the noted Spanish author 'Manual'.  I may have to
> check out his stuff this evening.
>
> Thanks,
> Mark.
>
>
>
>
>> I believe the "passive switch" that was referred to was in the ftp
>> client
>> itself.  Basically, the way a "normal FTP connection" works is like
>> this:
>>
>> client        -->ftp -->       server
>>            <-- ftp-data --
>>
>> The client opens connections on port 20 and the server opens them back
>> to the client on port 21.  Passive mode turns around that second
>> connection
>> so that the client makes both of them like this:
>>
>> client        -->ftp -->       server
>>             -- ftp-data -->
>>
>> This works better when the _client_ is behind a firewall and the
>> server can't open a connection back to it.
>>
>> Cheers,
>> Tanner
>>
>>
>> --
>> Tanner Lovelace
>> clubjuggler at gmail dot com
>> http://wtl.wayfarer.org/
>> (fieldless) In fess two roundels in pale, a billet fesswise and an
>> increscent, all sable.
>> --
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