IPFW + dummynet to lower NNTP traffic priority

[Luigi Rizzo]

you must put a non-zero bandwidth on the pipe otherwise there is no
scheduling (0 means infinite bandwidth).
Also these are weights not priorities - even if one of the
queues has a very low weight it will still get some
bandwidth proportional to its weight.

cheers
luigi

On Tue, Jul 26, 2005 at 09:40:18PM -0600, Brad Waite wrote:
> I've been working on a way to keep my outbound NNTP traffic from
> interfering with all other traffic.  After reading the ipfw(8) man page
> and several other resources (including Luigi Rizzo's page), I thought I
> had it down:
> 
> ### Outbound
> ipfw pipe 1 config bw 0K
> ipfw queue 1 config weight 1 pipe 1
> ipfw queue 2 config weight 100 pipe 1
> ipfw add 1000 queue 1 all from any to any out dst-port 119 via fxp0
> ipfw add 1001 queue 2 all from any to any out via fxp0
> 
> ### Inbound
> ipfw pipe 2 config bw 0K
> ipfw queue 3 config weight 1 pipe 2
> ipfw queue 4 config weight 100 pipe 2
> ipfw add 1000 queue 3 all from [NNTP server IP] to any in via fxp0
> ipfw add 1001 queue 4 all from any to any in via fxp0
> 
> My thinking here is that both queues (in each direction) will share all
> available bandwidth, but any traffic heading out on port 119 or returning
> from the news serverwill be superseded by all other traffic.  If there's
> no other traffic, NNTP will be able to use all available bandwidth.
> 
> It would appear I'm not grasping the concepts.  Can anyone tell me what
> I'm doing wrong?
> 
> Thanks,
> 
> Brad Waite
> 
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