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 From:  "Bob Young" <bob at lavamail dot net>
 To:  "'Klaus Stock'" <ks at stock dash consulting dot com>
 Cc:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  RE: [m0n0wall] Dynamic pipe...virtual pipe. What's the difference?
 Date:  Mon, 25 Sep 2006 00:51:15 -0400
Hi Klaus:

Thank you so much for your email.  I sincerely appreciate your input.

I apologize for not being able to reply sooner.

I like your definitions of virtual and dynamic pipes.

I noticed that on the Monowall Traffic Shaper pipe page, that Monowall calls
the pipes which are set up with masks "dynamic".  I think they would have
better been called "virtual" by Monowall, since I believe the pipes are
created and torn down according to when the host is sending data or
receiving data.  And the pipes are at the speed they were created for
(assuming there is enough BW from the upstream provider). 


If a pipe mask AND a queue mask was used, BW can still be assigned.  But
here the pipe is fixed BW.  It appears that the BW is virtual and dynamic,
since queues are used.

Your definitions seem to fit these conditions pretty well, if I understand

Thanks much for your kind help.

If anyone else would like to comment, you are more then welcomedl...cause
I'm still learning this Monowall...lol.  

Thanks so much Klaus.

-----Original Message-----
From: Klaus Stock [mailto:ks at stock dash consulting dot com] 
Sent: Thursday, September 21, 2006 7:25 AM
To: Bob Young
Subject: Re: [m0n0wall] Dynamic pipe...virtual pipe. What's the difference?

> I'm trying to figure if there is a difference between a dynamic pipe and a
> virtual pipe.  Is there any?

A pipe is virtual when it's not physical (like a network adaptor which
limits the bandwidth because of hardware limitations).

A pipe is dynamic when it adjusts it's bandwidth according to some rules
(like allow less or more bandwidth for a certian address range).

> On the Traffic Shaper: Edit pipe page, I see that the word "dynamic" is
> used.  But I think I have seen the word "virtual" used also in relation to
> the pipes.
> I'm not real sure that dynamic and virtual mean the same thing.

In case of the m0n0wall, a dynamic pipe is a special case of a a virtual
pipe (all pipes which can be configuared in the traffic shaper are virtual,
the physical pipes cannot be configured (and aren't shown) because they are
hardware (network adaptors/cables)).

You can switch a virtual pipe between dynamic and non-dynamic.

Best regards, Klaus
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