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Is it possible DHCP client check the contents of an option ?

I need provisioning a Linux server with DHCP option 140 (option-140).

But the server behaves as if the DHCP did not contain the information.

In the file /var/lib/dhcp/dhclient.eth0.leases

I do not see advanced DHCP options (option-140, option-141, option-142).

How can I manually request the DHCP server to give me the contents of an option (to control the content)?

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  1. Fire up tcpdump or tshark on eth0... look for all UDP packets and make your sniffer give verbose output (see manpage)
  2. sudo dhclient -r
  3. sudo dhclient
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