I have a suggestion for a feature for pf, adaptable tbr.
Instead of doing estimation of overhead of a network link like
a dsl uplink the tbr can be modified to adapt instead.
In my case I have run PPPoE over a DSL link that is AAL5 LLC/SNAP.
In altq_subr.c I changed:
tbr->tbr_token -= TBR_SCALE(m_pktlen(m));
to:
if (m_pktlen(m) <= 38)
tbr->tbr_token -=
TBR_SCALE((m_pktlen(m)+8+3+3+2+2+18+6+2+47)/48*53);
else
tbr->tbr_token -= TBR_SCALE(106);
my traffic shaper now works well even in the extreme cases where
DSL overhead is 165% (TCP ACK, 40 byte IP => 106 bytes ATM).
What would be really nice would be to be able to configure this
from pf.conf, something like
queue vr0_blk tbradapt PPPOE-LLCSNAP-AAL5 ...
It would be simple to add more adapters for the other media once
this is in place.
RFC1483 bridging over AAL5 LLC/SNAP:
if (m_pktlen(m) <= 46)
tbr->tbr_token -=
TBR_SCALE((m_pktlen(m)+8+3+3+2+2+18+47)/48*53);
else
tbr->tbr_token -= TBR_SCALE(106);
or PPP over AAL5 VCMUX:
tbr->tbr_token -= TBR_SCALE((m_pktlen(m)+8+2+47)48*53);
and so on.
Comments ?
/Tony
--
---
Tony Sarendal - [EMAIL PROTECTED]
IP/Unix
-= The scorpion replied,
"I couldn't help it, it's my nature" =-
