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Internal
Info
Ubuntu Version
lsb_release -a
Configuration
Network
Network Interfaces
ifup
ifup is one of the utilities that can be used to configure the network interfaces. It reads its configuration from /etc/network/interfaces.
NetworkManager
dhclient
DNS
DNS Resolver
DNS resolver is configured with resolvconf. Normally, resolvconf is invoked by network interface configuration programs, such as ifup, NetworkManager or dhclient. resolvconf can be run by administrators, but this s normally necessary.