John A. Sullivan III wrote:
On Mon, 2012-06-04 at 12:25 +0200, Marco Gaiarin wrote:
Mandi! Julien Vehent
In chel di` si favelave...
I'll try to find some time and move over some of the content I have
here: http://wiki.linuxwall.info/doku.php/en:ressources:dossiers:networking:traffic_control
Wonderful! ;-)
But i've a little note: i've ever known that it is not advised to set a
default class on classful qdisc, eg:
# tc qdisc add dev eth0 root handle 1: htb default 20
because in this way we shape also non-IP traffic (arp, ...) and it is
better to leave this traffic unshaped.
Better to use a filter that have a ''catch-all'' rule (on IP traffic).
I remember wrong?!
I'm not 100% sure but it may depend upon the qdisc. I believe some will
drop packets if there is no default class for them. Can anyone confirm
that? Thanks - John
Yea, HFSC will do that, which should also be flagged up as an important
"gotcha" in any example/doc.
HTB is kinder to testers in that by default unclassified goes unshaped.
Of course adding default X (where X!=0) changes that, and I think the
consequences eg. for arp should also be mentioned.
A lot of examples using default may well work - the default class has
enough bandwidth or sfq, but some I've seen have no child qdisc so get a
1000 packet pfifo and not much rate.
Depending on how much ip traffic gets into that class/the state of other
classes this may then cause apparently random faliure.
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