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a more advanced example for queues

# advanced queue example.
# give interactive ssh traffic priority over ssh bulk transfers (scp, sftp)

ext_if="dc0"
developerhosts="192.168.2.0/24"
employeehosts="192.168.0.0/23"

altq on $ext_if cbq bandwidth 5Mb queue { std, http, mail, ssh }

queue std bandwidth 10% cbq(default)
queue http bandwidth 60% priority 2 cbq(borrow red) { employees, developers }
queue  developers bandwidth 75% cbq(borrow)
queue  employees bandwidth 15%
queue mail bandwidth 10% priority 0 cbq(borrow ecn)
queue ssh bandwidth 20% cbq(borrow) { ssh_interactive, ssh_bulk }
queue  ssh_interactive priority 7
queue  ssh_bulk priority 0

block return out on $ext_if inet all queue std
pass out on $ext_if inet proto tcp from $developerhosts to any port 80 \
    keep state queue developers
pass out on $ext_if inet proto tcp from $employeehosts to any port 80 \
    keep state queue employees
pass out on $ext_if inet proto tcp from any to any port 22 \
    keep state queue(ssh_bulk, ssh_interactive)
pass out on $ext_if inet proto tcp from any to any port 25 \
    keep state queue mail