Re: [LARTC] Question about how TC enforces bandwidth limiting

[Vadtec <vadtec@vadtec.net>]

David Boreham wrote:
> The advice you received is pretty good.
> Avoid ingress shaping at all costs, and
> you don't need it anyway for your situation.
>
> Use egress shaping on both your internal and
> external interfaces.
> Traffic coming IN to your network gets shaped
> as egress traffic on the LAN interface.
> Traffic going OUT from your network gets
> shaped as egress traffic on the WAN interface.
> So all shaping is egress, but you're able to
> shape in both directions by always delaying
> packets as they are SENT by your router.
>
> Think of it this way : all you can really do is
> delay sending packets (or ultimately drop them
> which is the same as infinitely delaying).
> Packets arrive when they arrive, you have no
> control over that. This is why shaping has to be
> done on egress traffic -- it's the only lever you have
> to pull on.
>
>
>
Thank you! This is the first explanation that has actually made sense to 
me. Before I had a vague idea of what was being said.

I do have one question though. On the egress shaping on eth1 (LAN 
interface), when using iptables I should do everything in the 
POSTROUTING chain correct? That way it gets routed to the proper LAN 
node and still gets shaped, correct? If thats the case, I can have a 
setup working in no time (I hope).

Many thanks,

Vadtec
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