We want to use an RF760 for caching purposes only. The RF760 has 3.32 firmware.

Q: Can we increase the capacity of caching?
A: No

Q: What is the actual space reserved for caching in Rf760?
A: Caching is disabled in vs 3.32 firmware

Q: Can we change the Hard disk having more capacity?
A: No

Q: Can we increase the ram?
A: Yes, up to 1GB

Q: Will Increasing ram increase caching?
A: No, but increased ram will help speed up the overall performance

Q: Can we use DMZ as second wan interface after upgrading the device to 3.32?
A: Yes