Re: Patch to allow for the ATM "cell tax"

Linux Advanced Routing and Traffic Control

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Russell Stuart wrote:
The following patch to tc allows it to perform an exact
ATM / ADSL rate calculation.  It adds one extra keyword
to the "tc class add htb ..." command line: "atm".  There
isn't a lot of spare bits hanging around to record this,
so the patch adds the feature at the expense of always forcing the "overhead" parameter to be even.

With the patch, these commands will generate a correct
rate table for:

  PPPoA + VC/Mux:  tc class add htb ... overhead 10 atm
  PPPoA + VC/LLC:  tc class add htb ... overhead 18 atm
  PPPoE + VC/Mux:  tc class add htb ... overhead 34 atm
  PPPoE + VC/LLC:  tc class add htb ... overhead 42 atm

What would be the appropriate parameters for an RFC 1483 / 2684 LLC Encapsulation or VC Multiplexing?  Would the values above adjusted for the removal of PPPoX compensate?



Grant. . . .
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