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Shiyao Wang
Asked: 2022-12-27 00:03:00 +0800 CST

Can DHCP Option121 work with DHCP Option3 together?

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I have a router with DHCP Option3(Router) set, and it works well.

DHCP Option3

My Ubuntu22.04 machine was able to configure the default route automatically.

Ubuntu Route Option3 Only

Yesterday, I configured DHCP Option121 (Classless route) on my DHCP Server.

DHCP Option121

After this configuration change, my Windows machine was able to get both configuration information (3 and 121) from DHCP.

However, my Ubuntu22.04 machines dropped configuration information from Option3 and no default route is configured.

Ubuntu Route Option121 Configured

I wonder if this is by design? Or did I misconfigure anything?

linux

1 Answers

  1. Best Answer

    "If the DHCP server returns both a Classless Static Routes option and a Router option, the DHCP client MUST ignore the Router option."

    https://www.rfc-editor.org/rfc/rfc3442.html

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