Monitor last lines of messages file journalctl --no-hostname --follow --boot Output log in a colored fashion grc journalctl --no-hostname --follow --boot Monitor log for Intrusion Detection System Monitor last lines of DDOS protection journalctl --no-hostname --follow --boot --unit fastnetmon.service Monitor last lines of Dynamic Host Control Protocol (DHCP) Monitor last lines of DHCP server journalctl --no-hostname --follow --boot --unit isc-dhcp-server.service Monitor last lines of DHCP client journalctl --no-hostname --follow --boot --unit "dhclient@*.service" Show DHCP client log on specific interface journalctl --no-hostname --follow --boot --unit "dhclient@$6.service" Monitor last lines of Dynamic Host Control Protocol IPv6 (DHCPv6) Monitor last lines of DHCPv6 server journalctl --no-hostname --follow --boot --unit isc-dhcp-server6.service Monitor last lines of DHCPv6 client journalctl --no-hostname --follow --boot --unit "dhcp6c@*.service" Show DHCPv6 client log on specific interface journalctl --no-hostname --follow --boot --unit "dhcp6c@$6.service" Monitor last lines of flow-accounting log journalctl --no-hostname --boot --follow --unit uacctd.service Monitor last lines of Linux Kernel log journalctl --no-hostname --boot --follow --dmesg Monitor last lines of NHRP log journalctl --no-hostname --boot --unit opennhrp.service Monitor last lines of PPPoE log journalctl --no-hostname --boot --follow --unit "ppp@pppoe*.service" Monitor last lines of PPPoE log for specific interface journalctl --no-hostname --boot --follow --unit "ppp@$6.service" Monitor log for Routing Protocol Monitor log for OSPF journalctl --follow --no-hostname --boot /usr/lib/frr/ospfd Monitor log for OSPF for IPv6 journalctl --follow --no-hostname --boot /usr/lib/frr/ospf6d Monitor log for BGP journalctl --follow --no-hostname --boot /usr/lib/frr/bgpd Monitor log for RIP journalctl --follow --no-hostname --boot /usr/lib/frr/ripd Monitor log for RIPng journalctl --follow --no-hostname --boot /usr/lib/frr/ripngd Monitor log for static route journalctl --follow --no-hostname --boot /usr/lib/frr/staticd Monitor log for Multicast protocol journalctl --follow --no-hostname --boot /usr/lib/frr/pimd Monitor log for ISIS journalctl --follow --no-hostname --boot /usr/lib/frr/isisd Monitor log for NHRP journalctl --follow --no-hostname --boot /usr/lib/frr/nhrpd Monitor log for BFD journalctl --follow --no-hostname --boot /usr/lib/frr/bfdd Monitor log for MPLS journalctl --follow --no-hostname --boot /usr/lib/frr/ldpd Monitor last lines of Simple Network Monitoring Protocol (SNMP) journalctl --no-hostname --boot --follow --unit snmpd.service onitor last lines of Secure Shell (SSH) journalctl --no-hostname --boot --follow --unit ssh.service