It seems to be supported under 2.2.x and up.  In xconfig, under
'networking options' (kernel 2.2.19), the last entry is for "QoS and/or
fair queueing", QoS == Quality of Service, A.K.A. traffic shaping.

>From the help tab:

CONFIG_NET_SCHED:

When the kernel has several packets to send out over the network
devices, it has to make a decision which one to send first. This is
especially important if some of the network devices are real time
devices that need a certain minimum data flow rate. There are
several different algorithms for how to do this "fairly"; they are
called packet schedulers. ... 

According to some Redhat propaganda it's configured through IPCHAINS:

    7.37 Why do the new 2.1.x and 2.2.x kernels use IPCHAINS instead of
IPFWADM? 

    IPCHAINS supports the following features that IPFWADM doesn't: 

           "Quality of Service" (QoS support) 
           ...
I'd suppose the (misguided) VOIP people would be a good source for
implementation details.

Steve

Jiva DeVoe wrote:
> 
> Is it possible to configure a linux firewall to prefer traffic from a
> certain host?  In other words, if you have 2 hosts on a network, and
> one is doing a download, if the second one starts something up, it
> will *NOT* be affected by the download on the first box, but the first
> box's traffic will slow down to allow the second one through?
> 
> --
> Jiva DeVoe
> VP Of Software Development
> Opnix, Inc. - Simply coolio bandwidth.
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