Whole Home under it's present configuration works fine under switched Ethernet (albeit unsupported) or you can leverage the supported configuration and have the coax cables transfer the IP streams between the receivers. I run a hybrid with some on DECA and some on switched Ethernet transparently. I also am responsible for my own troubleshooting and problem resolution as result however.
The HMC machines (HR34 and HR44) are unique in that they will actively communicate on BOTH the switched Ethernet and DECA fabrics and can be used to bridge the two fabrics. This does mean though that when the HMC is down or in reboot the whole DECA side of the network (with respect to services outside the DECA fabric itself) will be down as well. I prefer to use a CCK (Cinema Connection Kit) as my bridge. I am running the wireless model with its radio switched off and it functions wonderfully as a wired bridge between the two fabrics.
Assuming you have all the receivers already on whole home and the HR34 is connected to the Switched Ethernet you are already set to go! You would just need to grab a range of IP addresses outside your DHCP pool's boundaries and run the advanced network setups on each receiver and put in your static values.
If you are not running whole home currently and possibly do not have the proper green label splitters it all works perfectly fine under switched Ethernet and same deal with assigning the static addressing. But in this realm you are on your own with supporting problems.
Having your whole home encased in DECA and addressing the receivers from outside it using your switched network should work fine.
Don "and once you've worked through it you will realize it's far less complicated than the programming you are doing" Bolton