On 23-May-2002 at 21:28:19 Jim Grossl wrote:
> Are your saying that you have or are thinking of configuring
> your firewall to filter out packets with non-privileged ports in the
> *source* address?
>
Yes, we have...
> If you could I would think this would shutdown a great deal of incoming
> tr
On Friday 24 May 2002 02:15, Michael Doughty wrote:
> > Yes, and it is the sending port that is blocked. That is my point.
> > If a remote mail server sends a message to our mail server using a
> > non-privileged port (i.e. the port they use to send the msg to us),
> > and we block that port, then
To: [EMAIL PROTECTED]
From: John Horne
Date: Thu, 23 May 2002 09:57:44 +0100 (BST)
> On 23-May-2002 at 01:11:56 Doughty, Michael wrote:
> >
>
> Yes, and it is the sending port that is blocked. That is my point. If a
> remote mail server sends a message to our mail server using a non-privileg
-Original Message-
From: John Horne [mailto:[EMAIL PROTECTED]]
Sent: Thursday, May 23, 2002 7:10 AM
To: [EMAIL PROTECTED]
Subject: Re: non-privileged port selection - how is it done?
On 23-May-2002 at 12:56:33 Larry Mitchell wrote:
> For a service like SMTP and POP the ports the serv
John,
> Given a service such as e-mail which uses a non-privileged
> port to send mail out, are there are any specific mechanisms as
> to which port is selected? This will no doubt be dependant on the
> O/S, but is it really a random numbered port, the first
> non-privileged port it knows is
You are missing something. Email has a specific port associated
with various functions. For instance, SMTP is port 25. This port
is the one that the *server listens* on. Meaning if you want to
send some mail to that server (A), your server(B) chooses a random
port on it's side(X), and connects
On Wed, May 22, 2002 at 02:28:00PM +0100, John Horne wrote:
> This will no doubt be dependant on the O/S, but is it really a random
> numbered port, the first non-privileged port it knows is not in use, or does
> the O/S have any other mechanism for selecting the port?
Well, it really depends on t
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Hi,
> Given a service such as e-mail which uses a non-privileged port to
> send mail out, are there are any specific mechanisms as to which
> port is selected? This will no doubt be dependant on the O/S, but
> is it really a random numbered port, t
On 23-May-2002 at 01:11:56 Doughty, Michael wrote:
> You are missing something. Email has a specific port associated
> with various functions. For instance, SMTP is port 25. This port
> is the one that the *server listens* on. Meaning if you want to
> send some mail to that server (A), your se
On 23-May-2002 at 12:56:33 Larry Mitchell wrote:
> For a service like SMTP and POP the ports the servers use to talk are
> actually VERY specific to my knowledge. Either being 25 for SMTP or 110
> for POP. Keep in mind that the random numbered ports are on the ORIGIN
> end not the destination. I
John,
For a service like SMTP and POP the ports the servers use to talk are
actually VERY specific to my knowledge. Either being 25 for SMTP or 110 for
POP. Keep in mind that the random numbered ports are on the ORIGIN end not
the destination. In other words Your machien/server would connect
On 23-May-2002 at 00:27:11 Jay D. Dyson wrote:
>> My problem is that given that a site has a firewall blocking specific
>> non-privileged ports (e.g. ) against all IP traffic (both as a source
>> port or a destination port), if a genuine site tries to e-mail them a
>> message and the sending h
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