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?
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