routing traffic based on port
I have been looking around but obviously havent typed the right combo of words into google yet.
We have a system with a primary link through which most of our traffic goes, however this is not controlled by us (and has some major limitations regarding blocked ports etc). We also have a DSL link which we would like to be able to send some traffic over.
We have managed using routing (on an IPCOP box) to send some stuff based on address range via the DSL but we would like to be able to send stuff out based on port. Is this possible? for example NTP for network time sync is currently blocked via our main provider so we would like all NTP requests to be routed via our DSL etc.