Weighted Fair Queueing

Pipes implement static bandwidth, but sometimes we want dynamic bandwidth sharing

The answer is Weighted Fair Queueing:
Decouple queue and pipe
Each queue is assigned a weight
Each queue gets a fraction of the bandwidth proportional to its weight
Only queues with backlogged traffic compete for bandwidth

ipfw pipe 10 config bw 2Mbit/s
ipfw queue 1 config pipe 10 weight 50
ipfw queue 2 config pipe 10 weight 20
ipfw queue 3 config pipe 10 weight 1
ipfw add queue 1 tcp from me to any ssh
ipfw add queue 1 udp from me to any 53
ipfw add queue 2 tcp from me to any 25
ipfw add queue 3 ip from me to any