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What commands are you using to set the Bootp-gateway? I am trying to switch from DHCP options to ip helper. our DHCP server is running on the core router. When I remove the Bootfile line from the DHCP pool on the router I get the PXE-E53 error.
The beauty of IP-helper approach recommended by Microsoft is that you do not need to configure anything there – just set up IP helper pointing to your PXE-enabled DP (at that time you will probably have two IP-helpers, one pointing to your DHCP and the second – to DP). Open necessary DHCP and BOOTP ports if there is a firewall. That should be enough to PXE boot a bare-metal Client. As a troubleshooting step you can bring a Client to the same subnet as your DP (assuming you have DHCP on that subnet). See if your DP can provide image to the machine on the same subnet (it will exclude IP-helper). If that work – see IP-helper config. If not – check your DP config (boot image etc..)