I have stumbled upon Riverbed.com's products which basically has the capability to hash chunks of IP data and subsequently store them to disk. I'm looking for an open source / cheaper alternative.

WANProxy is the exact equivalent except that it only keeps data in-memory and can't store the data to disk which is a requirement for our solution.

I'm basically looking for a proxy which not only looks at the files (filenames) but the data itself being transmitted at the packet level.

Anyone?

Thanks!