This post is a follow on from my post last week regarding how to install the telnet client. The telnet client is simple yet extremely powerful in helping us gain a quick idea of where a problem may lie with TCP connectivity, it’s one of my first go to tools to use when testing a network connection to a server.
Category Archives: How To - Page 13
How to test network connectivity with telnet
Posted by Jarrod Farncomb
on February 18, 2015
7 comments
How to enable the telnet client in Windows 8.1
Posted by Jarrod Farncomb
on February 11, 2015
3 comments
By default the telnet client in Microsoft’s Windows operating systems is disabled, this is unfortunate as it is an extremely useful tool which can be used for testing TCP connectivity to external hosts on a specified port.
This is great when you’re trying to troubleshoot network connectivity problems, for example, say we have a web server which should be listening on port 80 to serve HTTP traffic but we are not able to load a web page, by using telnet to connect to the web server on port 80 we can verify the connectivity.
It may be that the connectivity is fine but there is a problem with the web server, or that the web server is stopped and the port is not listening at all, for instance. With telnet we can get a better understanding of what’s going on.
How to use the CloudNS DNS resolver with Windows
Posted by Jarrod Farncomb
on September 15, 2013
No comments
In this post I outline how you can set up and use the CloudNS DNS resolver on a Windows computer. CloudNS is a free security focused service currently providing two servers in Australia for DNS resolution. CloudNS only allows connections with DNSCrypt which ensures messages are safely and securely sent to the resolver and not tampered with, DNSSEC is also supported. The resolvers also support Namecoin resolution which is an alternative decentralized DNS system, allowing you to start accessing .bit domains. CloudNS also does not log any of the queries or connections taking place, keeping things anonymous.
How to Increase the size of a Linux LVM by adding a new disk
Posted by Jarrod Farncomb
on December 14, 2012
171 comments
This post will cover how to increase the disk space for a VMware virtual machine running Linux that is using logical volume manager (LVM). Firstly we will add a new disk to the virtual machine and then extend the original LVM over this additional space. Basically we will have two physical disks but just one volume group and one logical group that is using the space on both disks together. With this method there is no down time for the virtual machine.
How to Increase the size of a Linux LVM by expanding the virtual machine disk
Posted by Jarrod Farncomb
on December 12, 2012
302 comments
This post will cover how to increase the disk space for a VMware virtual machine running Linux that is using logical volume manager (LVM). Firstly we will be increasing the size of the actual disk on the VMware virtual machine, so at the hardware level – this is the VM’s .vmdk file. Once this is complete we will get into the virtual machine and make the necessary changes through the operating system in order to take advantage of the additional space that has been provided by the hard drive being extended. This will involve creating a new partition with the new space, expanding the volume group and logical group, then finally resizing the file system. Read more »