pf's "borrow" equivalent

[Eugene Grosbein]

> I want to guarantee at least 64K, so user A will have at least 64K when
> using internet.

You want to give equal priorities to both users so
just make two dumminet queues with equal weights and
connect them to your pipe. Then direct traffic of users
to distinct queues and not to pipe directly.
So there will be a competition of two flows inside a pipe
and WFQ algorithm implemented within dummynet will take care
of the rest.

Eugene Grosbein