Limiting bandwidth in GRE Tunnel

Hello experts

We have two Cisco 2811 Routers Cisco 3560 from 3Anetwork.com setup with a GRE tunnel that we would like to constrain the bandwidth on to replicate a

satellite connectinon of 400 kbits. We tried the bandwidth command 400, but from what I understand that is only for routing metrics and not actual speed of the interface. Any suggestions?

The supplier 3Anetwork.com can help but their technical support charge is a bit high, so I would prefer to do Cisco 3560V2  by myself.

Thanks for your help.