[LARTC] how to reduce a bandwidth?

[chsilva@xxxxxxxxxxxxxx (Carlos Horacio Silva Elizondo)]

hi, I just want to know if somebody can help me to reduce a bandwith
with iptables.
 
I Have this configuration  Box is a Gateway
etho 148.245.89.1 External Network 
eth1 192.168.1.1 Internal Network DHCP server
 
I want to reduce all the internal network traffic to a specific bandwidth
example : 5kbps
 
All Network Cards are 10/100mbps
 
thanks!
Carlos Silva