ubuntu 18.04: not releasing old IPs from DHCP
73215
Ubuntu 18.04 minimal server has two IP addresses!
61492
Where does netfilter-persistent save the iptables rules?
59587
Why doesn't "ipconfig /flushdns" completely wipe your DNS?
156065
linux setting a server to static ip and server name
128671
DNS on static IP address
140704
How to set a static IP address?
148095
Locally, External IP Resolves to Router Admin
74749
Command line program to test DHCP service
16703
No DNS resolution after upgrade from ubuntu 14.04 to 16.04
17046
iptables: difference between NEW, ESTABLISHED and RELATED packets
46194
Why some iptables DNAT rules don't work until reboot?
134119
Debian workaround 838871: dhcp network configuration without blocking boot process
153039
How to stop dhclient from updating resolvconf on Debian?
124404
How can I release and renew my DHCP lease from Terminal?
833
Can I have multiple DHCP servers on one network?
136683
Rogue DHCP Server Can't be found
140313
How do I set a static IP in Ubuntu?