ipfw pipe config bw tun0

[Allan Jude]

On 2014-06-29 10:52, Luigi Rizzo wrote:
> On Sun, Jun 29, 2014 at 4:16 PM, Wojciech Puchar <
> wojtek at wojtek.tensor.gdynia.pl> wrote:
> 
>> i tried to use ipfw dummynet as described in manual
>>
>> ---
>> If a device name is specified instead of a numeric value, as in
>>
>>                    ipfw pipe 1 config bw tun0
>>
>>              then the transmit clock is supplied by the specified device.
>> At
>>              the moment only the tun(4) device supports this functionality,
>>              for use in conjunction with ppp(8).
>>
>> ----
>>
>>
>> got "no if support" error message. what i missed?
>>
> 
> you missed ​nothing -- it's just that no device that i know
> of still implements the feature.
> i implemented it 15 years ago and enabled it on the 'ed'
> device driver only.
> 
> What it needed is a notification on the transmit
> interrupt to kick the pipe and tell it how many
> packets went out (at the time 'ed' only supported
> one packet at a time, so the code might make
> assumptions).​
> 
> It might need a bit of redesign these days to make it
> work efficiently with fast pipes and deep interface queues.
> 
> cheers
> luigi
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> 

If you check out the IPFW article in the FreeBSD Journal May/June issue,
I have some better examples. When I get time I'll work similar examples
into the handbook and maybe the man page.

-- 
Allan Jude

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