❦ 29 décembre 2016 23:09 GMT, Wookey <wookey@wookware.org> :
> I still don't know what a qdisc is or a default group, but it's a lot
> easier to find things I do recognise. Before this discussion I just
> saw it as a mysterious jumble of 10 things (after a set of things in
> CAPITALS that were somewhat mysterious too (what's a LOWER_UP, I
> wonder) - who knows what it might mean.
iproute is developed in lockstep with the kernel (you can use all the
features from the kernel X.Y if you have at least version X.Y) and
exposes all the information the kernel knows about an interface.
LOWER_UP is a flag (like UP, BROADCAST), hence the use of upper case. It
means that the lower interface is up. For a physical interface, it means
the driver says the interface is operatively up (while UP is an
administrative flag). For a virtual interface, like a VLAN, it is the
status of the lower interface.
A qdisc is a "queuing discipline". It is related to QoS and you can
change it with "tc" (another tool from iproute).
Each interface can be assigned a group (a number). This is not much
used. It can be used to make "ip link" operate on a group of
interface. It can be used with Netfilter too (devgroup).
--
Don't stop at one bug.
- The Elements of Programming Style (Kernighan & Plauger)
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