protocol

Dovecot: Fatal: Error in configuration file /etc/dovecot/dovecot.conf: protocols: Unknown protocol: sieve

1.0 Error: While configuring the Dovecot Mail Delivery Agent, the Dovecot server would not start and the following error messages were printed. $ sudo systemctl start dovecot Job for dovecot.service failed because the control process exited with error code. See “systemctl status dovecot.service” and “journalctl -xe” for details. $ systemctl status dovecot.service ● dovecot.service – …

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ss command in Linux

1. ss command The ss command gives the socket statistics. It gives information about the network connections. ss is a replacement for the netstat command. By default, the ss command gives information about non-listening sockets. $ ss Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port u_str ESTAB 0 0 * 4482 * 4481 u_str ESTAB …

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ip command in Linux with examples

1.0 INTRODUCTION The iproute2 package contains utilities for network and traffic control. The major commands in iproute2 package are the ip command for IPV4 and IPV6 configuration and tc for traffic control. These commands replace the older ifconfig and the route commands of the net-tools package. iproute2 package utilities use the Netlink interface to communicate …

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netstat

1. netstat command The netstat command in Linux provides network statistics and information about the networking subsystem. It gives information about network connections, routing tables and network interface statistics. For example, $ netstat Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 myhost.local:53744 mail.example.i:imaps ESTABLISHED tcp 0 0 …

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Routing in Linux

In Internet, the Internet Protocol (IP) is at the Network Layer, which is the third layer of the ISO reference model of network architecture. IP deals with IP packets or datagrams, which are the basic transfer units in the Internet. The higher level protocols like UDP and TCP are built on top of IP datagrams. …

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Synchronize your computer’s clock using the NTP

Coordinated Universal Time The Coordinated Universal Time (UTC) is the universally accepted time standard based on atomic clocks with leap seconds added judiciously to keep it in tune with the traditional solar time. The UTC is available as standard from designated national measurement institutes (NMIs) in most countries. It is used as the standard by …

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