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configuration needed to a Cisco Layer 3 Switch acting as DHCP to perform PXE booting

Dears, 

on my domain, we have created a new Server acting as a WDS server, but our DHCP server is a Cisco Layer 3 Switch delivers IPs across 5 VLANs, all option is now ready on WDS server but i'am not sure of dhcp configuration commands on the switch 

we set the ip helper command to indicate the wds server for clients

option 66 (ip of the wds)

option 67 (filename) i'am not sure of it & i need the help how to write it 

PCs already gets ips from the dhcp while booting but the following error occurred

http://store1.up-00.com/2016-09/1475048895111.jpg

notes :

we have a symantec end point firewall, does it block the tftp port on it ??

does option 60 for dhcp must specified in switch configuration ?

i read some about broadcasting packets across vlans to reach the wds server ?

thanks






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