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i want to change my hostname that appears in my router DHCP things that i already tried 

sudo hostname ___

also tried to change it from /etc/hostname and /etc/hosts

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you need to do that on the router not on the host.

this will typically be done by assigning an ip and hostname combination to the mac address of the network adapter you use on your host.

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    My router uses the device's hostname, but I found that it caches it, so it doesn't refresh if I change it.
    – You'reAGitForNotUsingGit
    Sep 27, 2016 at 13:42
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    if you host is set with a specific hostname it will include this in the DHCP query , this will be how the router knows about it. It will be cached for the lifetime of the DHCP lease.
    – Amias
    Sep 27, 2016 at 13:44

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