Discover DNS Server
How can a node discover the DNS Server in the network other than through DHCP /manual configurations ?
Is there any broadcast message specific for DNS Server ?
heh. There is no specific broadcast message in the DNS protocol, but considering how broadcast is just UDP, and it is sent to every UDP bound service on a given port, then I dont' see why you can't manipulate things a little. You may have to code a little program though. This program would send a UDP broadcast DNS request on port 53. Then it will sit back and take note of any responses that are sent from dns servers on the network. Then the program can notify the user of all the server IP's.