Are you trying to provide a DHCP service to clients or are you trying to get a DHCP client to use a specific DNS server (say, for browsing?).
Uhhh port 67 is for DHCP server broadcasts. If a DHCP client was not negotiating properly for a lease, the DNS service would be the least of your worries.
If you are not getting any information about DNS servers in your DHCP responses then you are either explicitly telling dhclient to _not_ use the DNS inf (rare) or the information is not being supplied.
So I guess I'm not really sure if or what your problem is.
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