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 Getting configuration  files from TFTP depends on which DHCP server you are using. Regarding  Cisco routers, you have to add this option 'option 66 ascii "xxx.xxx.xxx.xxx"' where xxx's are the IP address.     ISC's DHCP server requires a bit of different format 'option tftp-server-name "XXX.XXX.XXX.XXX";''  
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