I receive lots of emails from people asking something like the following:
How can I control the internet bandwidth among the LAN PCs behind the IPMASQ server? Some times any local pc is downloading and it it will take the majority of the bandwidth and thus the other PCs get little bandwidth.
This topic really doesn't have anything to do with IPMASQ and everthing to do with Linux's built-in traffic shaping and rate-limiting abilities. You will find information about this on the LDP such as the ADSL Bandwidth HOWTO, the Advanced Rouring HOWTO, and the Bandwidth Limiting HOWTO. Please understand this is an advanced topic and any question you may have will be better served from people from those forums.