Bandwidth Prioristising based on Application

Hi all,

I have an apparently basic QoS requirement. Basically, I have one
application which I would like to get priority over our 256k leased
line between two sites. The application is MFGPro - so essentialy I
have a databse server at a remote site, and a few users working with
it (mainly reading) at our site. There will also be e-mail, file
sharing and some web traffic traversing the link.

All I want to do is prioritise the MFGPro traffic. I started reading
the 'Advanced routing howto' for linux, and must admit found it
daunting. Do you think that it would be sufficient to follow the
suggestions in the cookbook section re using IPTABLES to manipulate
TOS bits for this traffic (which goes to a known dedicated TCP port) ?
i.e. :

Should you have an application that does not do this, you can always
do it with netfilter. On your local box:
# iptables −A OUTPUT −t mangle −p tcp
−−dport telnet \
−j TOS −−set−tos Minimize−Delay
# iptables −A OUTPUT −t mangle −p tcp
−−dport ftp \
−j TOS −−set−tos Minimize−Delay
# iptables −A OUTPUT −t mangle −p tcp
−−dport ftp−data \
−j TOS −−set−tos Maximize−Throughput

But substitute the appropriate port number/s for our application.

Any thoughts and advice most welcome !

Cheers,

Craig Jackson