[mxvzr]

Thank you so much for posting these two options; The RPI kept sending TFTP requests to the machine running the DHCP server despite my attempts to specify another IP (the "official" documentation specifies pxe-service=0,"Raspberry Pi Boot" to which I added the filename & ip as per dnsmasq man page; same thing with dhcp-boot parameter)

[emj]

I do not know if this is an issue with RPI, but some crappy devices only support TFTP from the DHCP server, you can solve this with two dhcp servers or iptables port forwarding.