NetworkManager and team in RHEL7 In previous Red Hat Enterprise Linux releases, the default way to configure networking was using network scripts. The term network scripts is commonly used for the script /etc/init.d/network and any other installed scripts it calls. The user supplied files are typically viewed as configuration, but can also be interpreted as an amendment to the… Continue reading NetworkManager and team in RHEL7

Something you need to know about NTP, timezone and system time

NOTE: All the answers are excerpts from related reference web pages. How time zones are handled with NTP? NTP does not regconize time zones, instead it manages all time information based on UTC. In general the handling of time zones is a job of a computer’s operating system. Under Windows, Linux and FreeBSD the system… Continue reading Something you need to know about NTP, timezone and system time

tcpattemptfails $ ndd -get /dev/tcp tcp_time_wait_interval 60000 $ ndd -get /dev/tcp tcp_fin_wait_2_flush_interval 16000 $ ndd -get /dev/tcp tcp_rexmit_interval_max 10000 $ ndd -get /dev/tcp tcp_ip_abort_interval 60000 $ ndd -get /dev/tcp tcp_keepalive_interval 90000 $ ndd -get /dev/tcp tcp_conn_req_max_q 16384 $ ndd -get /dev/tcp tcp_conn_req_max_q0 16384 $ ndd -get /dev/tcp tcp_xmit_hiwat 131072 $ ndd -get /dev/tcp tcp_recv_hiwat 131072… Continue reading tcpattemptfails

Spanning Tree Protocol and PortFast

What is Spanning Tree and Portfast, and how can they affect my Altiris environment? During the execution of the Spanning-Tree Algorithm, Spanning-Tree will force the ports to go into five different states: Blocked Listen Learn Forward Disabled The transitioning period from state to state takes the following times by default: From blocking to listening: 20… Continue reading Spanning Tree Protocol and PortFast