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Forums » Internetwork Expert Products » CCIE R&S Lab Workbook Volume I Version 5.0 » IP Services » 13.7 DHCP Proxy - issues with GNS3?
Latest post 05-03-2010 9:43 PM by ie_ccie_2009. 1 replies.
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  • 01-23-2010 5:58 PM

    13.7 DHCP Proxy - issues with GNS3?

    Reply Contact

    I wasn't able to get the solution to work as shown in the solution guide.  Debugs on the DHCP server showed that it was receiving the request and that it was unicasting the DHCPOFFER to R3, but R3 never received the offer.  However, when I added "ip helper-address 155.1.146.6" to the serial interface, then it all worked.  I was using 3725 routers with 12.4(15)T10.  Anybody get this to work as shown in the SG using GNS3?
    • Post Points: 20

  • 05-03-2010 9:43 PM In reply to

    Re: 13.7 DHCP Proxy - issues with GNS3?

    Reply Contact

    Hi

    I believe this is an issue with GNS. My Solution in Dynamips is not working if i use exact same solution provided by SG.

    We need to understand that the Volume-1 Solution has been written keeping in mind the real Routers, while dynamips/GNS can have some bugs and can behave anomalously.

    As far as solution is concerned to make this work, I used the command "ip dhcp relay information option" which as per Cisco doc, automatically adds the circuit identifier suboption and the remote ID suboption to the DHCP relay agent information option (also called option 82). This made the solution working however Task 13.8 asks the DHCP information option to use as a separate Task. 

    "ip helper-address" is one of the ways of using a DHCP Relay agent. So if you use this command, then there is no need for a DHCP Relay agent command to use, i.e. "ip address-pool dhcp-proxy-client" & "ip dhcp-server 155.1.146.6".

    Hope this helps.

    Regards,

     

    Muhammad
    • Post Points: 5
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