query in relay behavior

ameen.shajahan at wipro.com ameen.shajahan at wipro.com
Thu Mar 21 15:55:41 UTC 2013

Hi All,

Please find the below setup of DHCP v4 relay and please let me know the behavior happens in below test cases.

DHCP Server------------------------------------Relay----------------------------------Cisco switch-----------------------------PC
eth0-                           eth0-                                       access port            trunk port
                                                            eth0.1-                                       vlan1

Running relay like below use cases.

Use case 1 :
./dhcrelay -4 -d -i eth0.1   During this use case  , I supplied ipconfig /renew from Windows PC . But no message reaches relay .
                                                                            I would like to know why it's happening.

Use case 2 :
./dhcrelay -4 -d -i eth0   During this use case  , I supplied ipconfig /renew from Windows PC . Forwarded BOOTRequest message comes in relay .
                                                                         I can able to see some messages.

Why client is not broadcasting message to virtual interface(eth0.1) . Why client looking for real interface(eth0).
Please let me know why it is so.


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