Re: Questions about traffic shaping

Andrew Gideon <(E-Mail Removed)> wrote in
news:x6W5o.6809$(E-Mail Removed):
> I'm looking into using something called ifb for this. I'd actually
> started looking at this over a year ago, but it got put aside and then
> I forgot about it.
> Thanks...
> Andrew

I dislike IFB. If it does not work for you, look into IMQ at
http://www.linuximq.net/ .
IWFM.
--
gypsy

Andrew Gideon <(E-Mail Removed)> wrote in news:hGh6o.553$au.494
@news.usenetserver.com:

> On Wed, 04 Aug 2010 17:37:35 +0000, buck wrote:
>
>> I dislike IFB.
>
> Why? How is IMQ better/different [for shaping over multiple
interfaces]?
>
> - Andrew

Did you visit the link I provided? Also have a look at the IMQ wiki:
http://wiki.nix.hu/cgi-
bin/twiki/view/IMQ/ImqFaq#What_can_I_do_with_IMQ

See also
http://www.linuxfoundation.org/colla...networking/ifb

The short answer is that IMQ allows everything availabe to an egress
QoS while IFB does not.

The reason that IMQ still exists is that many people consider it to be
superior to IFB. Were that not true, nobody would take the time to
maintain patches for IMQ.
--
buck

buck wrote:

> The short answer is that IMQ allows everything availabe to an egress
> QoS while IFB does not.

AFAIK the only case where IMQ is ever needed over IFB is if you are
nat-ing onto a single ip address both traffic from the shaping box and
forwarded traffic, and you then want to shape the ingress traffic from
the nat-ed interface taking it's destination into account. Because IMQ
hooks after it has been de-nated you can tell the difference between
packets headed for a local process and that to be forwarded to lan. With
IFB you can't as it hooks before the de-nat.

If you are not in that position, IFB can do anything IMQ can - you can
redirect from ingress or egress to ifb and thus use any qdisc you like.

Andy Furniss wrote:

> AFAIK the only ...

Maybe only was wrong - if you use connmark or similar and need to shape
inbound to a local process the same would apply - if you are forwarding
however, you could still use IFB.