Multiple Routes with One Byte Data in DHCP option 121 (Classless Static Route Option)

03/26/2020 10 People found this article helpful 486,763 Views

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STEP 1: Create Option Object

Go to Network > DHCP Server screen,

Step 2: Now, click on Advanced,

Step 3: Click DHCP Generic Option drop down Menu and select "Create New DHCP Option Object"

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 121" with OPTION ARRAY check-box "ENABLED" and OPTION TYPE set as "ONE BYTE DATA".

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

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

16;10;56;10;10;5;253;

16;10;58;10;10;5;253

OR

16;10;56;10;10;5;253;16;10;58;10;10;5;253

*It might form a continuous line but keep them separated by ";" (semi-colons), but separate each Route with a SPACE/ENTER.

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

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Multiple Routes with One Byte Data in DHCP option 121 (Classless Static Route Option)

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