Re: Strange port 20/21 problem with Netgear RT314 Router
From: Alun Jones (alun_at_texis.invalid)
Date: 11/29/05
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Date: Mon, 28 Nov 2005 19:52:28 -0800
QV wrote:
> "Triffid" <triffid@nebula.net> wrote in message
> news:ztcif.36605$gK4.1183753@news20.bellglobal.com...
>>
>> The router probably assumes you're running an ftp server when you tell
>> it to forward port 21, so you'll be needing port 20 for the data
>> connections.
>>
>> http://slacksite.com/other/ftp.html
>
> It seems dangerous for a router to "assume" anything, but the Netgear
> appears to be doing just that in the case of port 20. It makes me wonder
> what else it assumes.
If it really is assuming that port 20 needs to be open for inbound TCP
connections, then it's dopey. 20 is the source port for _outbound_ FTP data
connections on TCP. It's not the destination port.
Of course, if it's working as a straight IP packet filter, it has to allow
for traffic in both directions to and from port 20.
Alun.
~~~~
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