ping command HowTo - Linux / Unix Q & A from nixCraft

Ping using specific gateway interface or source IP address

last updated July 29, 2018 in FreeBSD, Linux, Networking, OpenBSD, UNIX

I have multiple gateways configured on my Linux or Unix based router. How do I ping through a specific interface of the gateway? How can I ping using a particular source IP address?

How to find disk I/O latency with ioping monitoring tool on Linux

last updated September 21, 2017 in FreeBSD, Linux, Mac OS X, OpenBSD, UNIX

How do I monitor disk I/O latency in real time on Linux, FreeBSD, OpenBSD, and MacOS operating system?

How to ping and test for a specific port from Linux or Unix command line

last updated February 18, 2019 in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, Ubuntu Linux, UNIX

I wanted to see if a specific port of a desktop computer or server is open from a Linux or Unix command line shell. How do I ping a specific port? Is it possible possible to ping an 192.168.1.254:80 or 192.168.1.254:23 ports?

OpnBSD PPTP Client: Install and Create a VPN

last updated December 1, 2012 in Networking, OpenBSD, UNIX

I work form home, and I need to login into our corporate network (Microsoft based PPTP server) using a pptp based vpn. How do I configure and setup up a PPTP VPN client under OpenBSD desktop / laptop or router / server operating systems?

HowTo: Speedup ping and traceroute Command Responses under Linux / Unix

last updated December 29, 2015 in Debian / Ubuntu, Linux, Networking, RedHat and Friends, Troubleshooting, UNIX

The following question was asked in the Unix networking exam:

How do you speed up ping and traceroute command responses under Unix or Linux operating systems?

How can I speed up my ping or traceroute commands on a Linux?

FreeBSD PPTP Client: Install and Create a VPN

last updated December 1, 2012 in FreeBSD, Networking, UNIX

I work form home and I need to login into our corporate network using a pptp based vpn. How do I configure and setup up a PPTP VPN client under FreeBSD desktop / laptop or server operating systems?

ping command: TTL Expired In Transit Error and Solution

last updated October 27, 2010 in BASH Shell, Networking

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?