Fog and site to site VPN

[klasikrkade]

Does FOG have this capability?

We have a main site with our FOG, DNS, DHCP server and secure VPN and many remote sites with secure VPN tunnels back to here.

My clients at the remote sites are picking up a DHCP address but are just sitting at the TFTP… syntax.
It never goes any farther (PXE is first in boot order. All clients work with no issues when not going over the VPN tunnels.

Any ideas?