Hi
If you need to use Kinetis there are a couple of possibilities:
- add extra SPI (or parallel) connected Ethernet controllers - eg. https://community.nxp.com/message/504096
- use a Micrel KSZ8863 PHY and use its tail-tagging mode to create two independent Ethernet interfaces from a single Ethernet controller in a Kinetis part
Both of these modes, and multi-homed networking, are fully integrated into the uTasker Kinetis project in case you also need a proven and immediately operational software solution to go with the hardware.... (also with integrated low power support of Kinetis part during operation).
Regards
Mark
Kinetis for professionals: http://www.utasker.com/kinetis.html