Is DHCP client of any use on my desktop computer?
I use my computer mainly for office purposes (web browsing/media consuming/libre office).
As I am setting up some firewall rules, I wish to restrict any process that is not useful.
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In very nearly all typical end-user configurations, network configuration of the host is done via DHCP. If you disable the DHCP Client (or block DHCP traffic with your host's firewall), it's exceedingly likely that your computer will still function, but anything requiring network connectivity will not.