Frequently Asked Questions About Linux / UNIX » netstat command http://www.cyberciti.biz/faq Every answer asks a more beautiful question. Fri, 03 Feb 2012 22:38:32 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Debian Linux Install OpenSSH SSHD Serverhttp://www.cyberciti.biz/faq/debian-linux-install-openssh-sshd-server/ http://www.cyberciti.biz/faq/debian-linux-install-openssh-sshd-server/#comments Wed, 11 Jan 2012 13:06:15 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=11384 How do I install OpenSSH sshd server under Debian GNU/Linux operating systems?]]> http://www.cyberciti.biz/faq/debian-linux-install-openssh-sshd-server/feed/ 0 RHEL 6: Change OpenSSH Port To 1255 ( SELinux Config )http://www.cyberciti.biz/faq/centos-redhat-enterprise-linux6-change-sshd-port-number/ http://www.cyberciti.biz/faq/centos-redhat-enterprise-linux6-change-sshd-port-number/#comments Fri, 13 May 2011 21:17:47 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10484 I've edited /etc/ssh/sshd_config to change the port number:
Port 1255
However, I'm getting an error as follows:
sshd[26792]: error: Bind to port 1255 on 192.168.1.100 failed: Permission denied
How do I change default OpenSSH port number from 22 to 1255 under RedHat Enterprise Linux server version 6 and SELinux? ]]> http://www.cyberciti.biz/faq/centos-redhat-enterprise-linux6-change-sshd-port-number/feed/ 3 Linux: Check Network Connection Commandhttp://www.cyberciti.biz/faq/check-network-connection-linux/ http://www.cyberciti.biz/faq/check-network-connection-linux/#comments Mon, 10 Jan 2011 19:50:28 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9703 How do I check network connections under Linux using command line options? ]]> http://www.cyberciti.biz/faq/check-network-connection-linux/feed/ 1 Linux Find Out My IP Number ( IP Address )http://www.cyberciti.biz/faq/what-is-ip-number-of-my-linux-server/ http://www.cyberciti.biz/faq/what-is-ip-number-of-my-linux-server/#comments Fri, 12 Nov 2010 20:30:25 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9317 How do I find out ip number (IP Address) of my Linux server using command line options?]]> http://www.cyberciti.biz/faq/what-is-ip-number-of-my-linux-server/feed/ 0 Linux: Find Out Which Process Is Listening Upon a Porthttp://www.cyberciti.biz/faq/what-process-has-open-linux-port/ http://www.cyberciti.biz/faq/what-process-has-open-linux-port/#comments Sun, 31 Oct 2010 18:02:23 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9174 How do I find out running processes were associated with each open port? How do I find out what process has open tcp port 111 or udp port 7000 under Linux?]]> http://www.cyberciti.biz/faq/what-process-has-open-linux-port/feed/ 13 ping command: TTL Expired In Transit Error and Solutionhttp://www.cyberciti.biz/faq/ttl-expired-in-transit-linux-unix-windows-router-error/ http://www.cyberciti.biz/faq/ttl-expired-in-transit-linux-unix-windows-router-error/#comments Wed, 27 Oct 2010 10:28:12 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9149 When I try to ping other UNIX / Linux / BSD or MS-Windows servers in our network I get the following message:
TTL Expired In Transit
How do I fix this problem?]]> http://www.cyberciti.biz/faq/ttl-expired-in-transit-linux-unix-windows-router-error/feed/ 1 HowTo: UNIX / Linux Open TCP / UDP Portshttp://www.cyberciti.biz/faq/linux-unix-open-ports/ http://www.cyberciti.biz/faq/linux-unix-open-ports/#comments Fri, 03 Sep 2010 02:25:35 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=8628 How do I open the TCP or UDP ports under UNIX / Linux like operating systems?]]> http://www.cyberciti.biz/faq/linux-unix-open-ports/feed/ 4 Nginx: Configure and Install With IPv6 Networking Supporthttp://www.cyberciti.biz/faq/nginx-ipv6-configuration/ http://www.cyberciti.biz/faq/nginx-ipv6-configuration/#comments Thu, 22 Jul 2010 01:52:06 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=8506 How do I configure IPv6 networking under nginx? How do I assign and use an IPv6 address under nginx web server? How do I enable IPv6 Support in nginx?]]> http://www.cyberciti.biz/faq/nginx-ipv6-configuration/feed/ 1 OpenBSD: Static Routing Configurationhttp://www.cyberciti.biz/faq/howto-setup-static-routes-on-openbsd-unix-networking/ http://www.cyberciti.biz/faq/howto-setup-static-routes-on-openbsd-unix-networking/#comments Tue, 06 Jul 2010 11:42:17 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=8151 I know how to setup static routing under Linux and FreeBSD operating systems. But, how do you setup static routing under OpenBSD operating systems?]]> http://www.cyberciti.biz/faq/howto-setup-static-routes-on-openbsd-unix-networking/feed/ 3 HowTo: Update Centos Linux 5.4 to 5.5http://www.cyberciti.biz/faq/centos-upgrade/ http://www.cyberciti.biz/faq/centos-upgrade/#comments Mon, 17 May 2010 21:31:07 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=7451 CentOS Linux v5.5 has been released. How do I upgrade CentOS Linux from version 5.4 to latest version 5.5 over the Internet?]]> http://www.cyberciti.biz/faq/centos-upgrade/feed/ 0 Debian / Ubuntu Linux: Install and Configure snmpd Servicehttp://www.cyberciti.biz/faq/debain-ubuntu-install-net-snmpd-server/ http://www.cyberciti.biz/faq/debain-ubuntu-install-net-snmpd-server/#comments Mon, 01 Feb 2010 15:44:08 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=6367 SNMP (Simple Network Management Protocol) is a protocol used for network management. How do I install SNMP server under Debian or Ubuntu Linux to configure various monitoring service?]]> http://www.cyberciti.biz/faq/debain-ubuntu-install-net-snmpd-server/feed/ 14 Linux: Show / Display Available Network Interfaceshttp://www.cyberciti.biz/faq/linux-list-network-interfaces-names-command/ http://www.cyberciti.biz/faq/linux-list-network-interfaces-names-command/#comments Tue, 12 Jan 2010 12:58:49 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10813 How do I display all available network interfaces names under Linux operating systems using bash shell prompt?]]> http://www.cyberciti.biz/faq/linux-list-network-interfaces-names-command/feed/ 0 FreeBSD: NIC Bonding / Link Aggregation / Trunking / Link Failover Tutorialhttp://www.cyberciti.biz/faq/freebsd-network-link-aggregation-trunking/ http://www.cyberciti.biz/faq/freebsd-network-link-aggregation-trunking/#comments Fri, 13 Feb 2009 19:42:49 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=3298 I've two Intel gigabit network card installed in HP server. I know how to setup bounding under CentOS Linux, but I'd like to do same under FreeBSD. How do I setup link aggregation of multiple network interfaces as one virtual trunk interface for the purpose of providing fault-tolerance and high-speed links under FreeBSD 7.x server? ]]> http://www.cyberciti.biz/faq/freebsd-network-link-aggregation-trunking/feed/ 16 Linux See Ethernet Statisticshttp://www.cyberciti.biz/faq/linux-ethernet-statistics/ http://www.cyberciti.biz/faq/linux-ethernet-statistics/#comments Sat, 31 Jan 2009 12:01:40 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=5604 How do I see Ethernet (eth) statistics under Linux operating systems?]]> http://www.cyberciti.biz/faq/linux-ethernet-statistics/feed/ 1 Solaris UNIX: Show Network Routing Table Informationhttp://www.cyberciti.biz/faq/solaris-unix-display-routing-table-status-with-netstat/ http://www.cyberciti.biz/faq/solaris-unix-display-routing-table-status-with-netstat/#comments Tue, 27 Jan 2009 06:42:09 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=5560 How do I show networking routing table information under Solaris UNIX operating systems using a shell prompt?]]> http://www.cyberciti.biz/faq/solaris-unix-display-routing-table-status-with-netstat/feed/ 0 Red Hat / CentOS: Check / List Running Serviceshttp://www.cyberciti.biz/faq/check-running-services-in-rhel-redhat-fedora-centoslinux/ http://www.cyberciti.biz/faq/check-running-services-in-rhel-redhat-fedora-centoslinux/#comments Wed, 14 Jan 2009 19:48:16 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=3065 Q. How do I list all currently running services in Fedora / RHEL / CentOS Linux server?]]> http://www.cyberciti.biz/faq/check-running-services-in-rhel-redhat-fedora-centoslinux/feed/ 11 Detecting DoS / DDoS Attack on a Windows 2003 / 2008 Serverhttp://www.cyberciti.biz/faq/detect-ddos-dos-attack-on-windows-server/ http://www.cyberciti.biz/faq/detect-ddos-dos-attack-on-windows-server/#comments Fri, 21 Nov 2008 08:28:12 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=2533 Question: How do I detect a DDOS (Distributed denial of service) / DOS attack on a Windows Server 2003 / 2000 / 2008? Can I use Linux netstat command syntax to detect DDoS attacks?]]> http://www.cyberciti.biz/faq/detect-ddos-dos-attack-on-windows-server/feed/ 7 Debian / Ubuntu: Apache2 Change Default Port / IP Bindinghttp://www.cyberciti.biz/faq/linux-apache2-change-default-port-ipbinding/ http://www.cyberciti.biz/faq/linux-apache2-change-default-port-ipbinding/#comments Fri, 14 Nov 2008 07:51:16 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=2438 Question: How do I change Apache 2 default port under Debian / Ubuntu Linux? I've couple of public IPv4 address assigned by my ISP, how do I force Apache2 to listen to a specific IP address? How do I change Apache2 IP address binding?]]> http://www.cyberciti.biz/faq/linux-apache2-change-default-port-ipbinding/feed/ 6 Bind Postfix Mail Server To Localhost or Specific IP Address Onlyhttp://www.cyberciti.biz/faq/postfix-receive-mail-on-specific-network-interfaces/ http://www.cyberciti.biz/faq/postfix-receive-mail-on-specific-network-interfaces/#comments Tue, 10 Jun 2008 13:13:42 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1102 http://www.cyberciti.biz/faq/postfix-receive-mail-on-specific-network-interfaces/feed/ 2 How To Tell If Your Linux Server Uses xinetd OR inetd severhttp://www.cyberciti.biz/faq/how-to-tell-if-your-linux-server-uses-xinetd-or-inetd-sever/ http://www.cyberciti.biz/faq/how-to-tell-if-your-linux-server-uses-xinetd-or-inetd-sever/#comments Mon, 10 Mar 2008 20:19:06 +0000 Vivek Gite http://www.cyberciti.biz/faq/how-to-tell-if-your-linux-server-uses-xinetd-or-inetd-sever/ http://www.cyberciti.biz/faq/how-to-tell-if-your-linux-server-uses-xinetd-or-inetd-sever/feed/ 2