DHCP options for PXE Boot?

I have a dhcp and tftp server on one subnet connected to Cisco router, a PXE boot client on another subnet connected to the same router. DHCP reply is setup and working properly. To make pxe boot client know what is the route (like point the router interface as default gateway) to tftp server, which DHCP option shall I use?

Thanks!
Rick1iAsked:
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Sanga CollinsSystems AdminCommented:
option 66, type = ip address, value = ip of tftp server
option 67, type = string, value = pxelinux.0

In similar setups where my client is in a different subnet from the tftp server, I use the DHCP server on the client subnet to set the above options. As long as the client can route to the ip of the tftp server it has worked for me. I use juniper netscreen and ssg devices, but the concepts should apply for cisco routers
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