Network Manager GUI Tool shows DNS servers in Wireless section. nmcli dev list iface command works for Ubuntu 13.10 and earlier. resolvectl status command available in newer Ubuntu versions. /etc/resolv.conf shows DNS servers but cannot be modified directly
AXIS IP Utility and Device Manager are free tools for network device management. Both applications support multiple browsers including Chrome, Firefox, Edge, Safari. Default IP addresses vary by AXIS OS version: 169.254.0.0/16 for 12.0+
BPDU Guard places ports in errdisable mode when receiving BPDU packets. Feature should be configured on access ports, not uplinks or downlinks. Can be configured in Global or Interface mode. Port-Fast forces immediate forwarding state, affecting loop detection
Docker automatically assigns IP addresses to containers using DHCP. Containers communicate using internal DNS through dockerd server. Docker.internal domain provides alternative host-to-container communication
DHCP automates IP address assignment to network devices. DHCP operates as client-server protocol with pool management. Clients broadcast requests to DHCP server after initialization. Server responds with IP address and lease duration
Network configuration can be done via interfaces file, NetworkManager, Systemd, or Netplan. Most network setup is done in /etc/network/interfaces for basic configurations. New systems use hardware-based interface names like eno0 instead of eth0