Andy Furniss wrote:
Andy Furniss wrote:
Jonathan Morton wrote:
So please add “atm overhead 32" to cake on eth0 or “atm
overhead 40” to cake instances on pppoe (these packets do not
have the PPPoE header added yet and hence appear 8 bytes to
small).
Thanks for your help, will definitely use them. Just wondering
if I use "pppoe-vcmux/bridged-llcsnap" on eth0 or
"pppoe-llcsnap" on pppoe0 would have the same effect? Or are
there some other "under-the-hood" changes when using them?
On the pppoe interface, use pppoe-vcmux if your modem is set to
use VC-MUX, or pppoe-llcsnap if it’s set to use LLC-SNAP (they
might be described using slightly different terms, but should
still be recognisable as one or the other). This probably
depends on your ISP, and may further vary regionally within the
same ISP.
I really prefer to use the self-explanatory keywords (which is
why I added them in the first place) instead of opaque magic
numbers. This is a point on which Sebastian has long disagreed
with me.
Either way (or maybe not!), what about the observation that
attaching cake on pppoe, for me at least, required the use of the
raw param due to the "auto compensation" mechanism seeing pppoe as
+8 when the actual packets are just ip len so not +8.
My case is not atm though, perhaps the atm param cancels out all
other auto overhead compensation?
Though that wouldn't really make sense for other use cases like shaping
on a real eth for some remote atm link.
Checking my not atm pppoe it seems without the raw param I would
actually be 14 + 8 bytes wrong.
tc qdisc add dev ppp0 handle 1:0 root cake bandwidth 19690kbit raw
overhead 34 diffserv4 dual-srchost nat rtt 200ms
results in -
qdisc cake 1: root refcnt 2 bandwidth 19690Kbit diffserv4 dual-srchost
nat rtt 200.0ms noatm overhead 56 via-ethernet
Random rambling on dual-srchost vs default triple - if I were to shape
ingress, which I don't because my ISP does it again now, I think
dual-srchost would be better in practice for home use. This being
because the CDNs of youtube or TV streamers - well blippers :-) like the
BBC netflix etc. may well mean that users that should be separate get
somehow lumped together - basically any assertion that it's rare for
different users to be downloading from the same remote server doesn't
really apply to streaming services.
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