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Multiple Routes with Hex String in DHCP option 249

03/26/2020 7 People found this article helpful 96,334 Views

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    Description

    This article covers how to configure multiple routes with hex string in DHCP option 249 (Private Use) on a SonicWall firewall.

    Resolution

    STEP 1: Create Option Object
    Go to Network | DHCP Server screen,

    Image
    Step 2: Now, click on Advanced,

    Image
    Step 3: Click DHCP Generic Option drop down Menu and select "Create New DHCP Option Object"
    Image
    Step 4: Now, you have to fill up all the necessary fields,

    OPTION NAME is the name of the object, OPTION NUMBER chosen is "DHCP Option 249" with OPTION ARRAY check-box "DISABLED" and OPTION TYPEset as "HEX STRING".

    Example: You have to Add two Routes:

    1)Network is 10.56.0.0/16 and Gateway is 10.10.5.253 and 

    2)Network is 10.58.0.0/16 and Gateway is 10.10.5.253

    When using Option Type as Hex String we have to convert each Decimal to its Hexadecimal value and add them in a continuous line but we have to separate each route with a SPACE/ENTER.

    In Order to convert a Decimal to its Hexadecimal value follow this link:

    "http://www.binaryhexconverter.com/decimal-to-hex-converter"

    Now, before converting the Decimals to Hexadecimals you have to write the whole Route in the following patter:

    "16;10;56;10;10;5;253" and start converting the Decimals starting from Left side i.e. 16;x;x;x;x;x;x as shown in the image below:

    Image

    Now the syntax that we have to use in this scenario goes as follows:

     

    100A380A050101                                   FOR Network 10.56.0.0/16 and Gateway 10.10.5.253 (16;10;56;10;10;5;253)
    100A380A050101100A3A0A050101  FOR Network 10.58.0.0/16 and Gateway 10.10.5.253 (16;10;58;10;10;5;253)

    Image 

    Step 5: In order to Verify the same, you can run a packet capture on WIRESHARK and the results should be as follows:

    Image

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    Categories

    • Firewalls > SonicWall SuperMassive 9000 Series > DHCP Server
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