Need some help with bootx64.efi and ipxe

[monte]

I have dhcp server A, tftpserver B, and tftpserver C

Client gets filename and next-server info from dhcp server A which points to tftpserver B. Then I chain to tftpserver C and try to load bootx64.efi on tftpserver C. That part works fine, but it then tries to load efidefault from tftpserver B instead of tftpserver C. I tried setting the filename and next-server settings, but it doesn't work. Is this just not supported or is something I am doing wrong?

Thanks
monte