monitoring-DORA-process

DORA PRoces:

D :Discover

O :Offer

R :Request

A :Acknowledgement

TO understand how clint can get ip address from server, this DORA process can very help full.

To view DORA process need a newly connected PC, which has no IP address.

Discover : A new system just connected to a network. That PC has only MAC address. The clint wants a IP address, but clint doesnt know server IP, so it will send a brodcast request(hear 255.255.255.255 is used for brodcast address.) with IP address 0.0.0.0, and MAC address A231.**** (System mac address).

Offer : One or more servers can recieve that brodcast message, and sent an OFFERED confiuration . server also dont know the clint IP, so server also send the brodcast message. Using MAC address clint can recieve the servers message.

Request: Then clint can REQUEST one of server's configuration, this will depends of which servers offer will comes first.

ACK: Finally server will sent and Acknowledgement.

1. ipconfig/release This command is used to release current IP configuration. so now clint has no IP address.

2. Now come to server, open network monitor. It's a default tool, in windows sever 2003.

To install this : Control panel -> Add or remove Programs -> Add or remove windows componentes -> management and Monitoring Tools -> go to details -> click Network monitoring Tools -> OK ->Next->Finish. It will appeared in administrative tools.
3. Network monitor will appear. click start capture button. Now it will capture all the Network traffic from server side. means capture all the data packets send or recieves from server.
4. Come to clint system open command prompt and type : ipconfig/renew. means clint wants a ip. clint send a brodcast message, and now starts DORA process. Finally clint recieve ip address.
5. This is all captured by network monitor. Now click stop capture button.
6. To view captured data, click on Display Captured Data button.
7. Now observe Frame no: 8,9,10,11. These are Discover ,Offer, Request, Ack Packets