DHCP automatic IP address v Static IP

For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

"My system chose its own IP address ... does it matter?" From Skype - a fresh server (a real "beast") is just being commissioned:

newsystem 06/08/2007 07:22
okay, this beastie has powers beyond my full comprehension. Firstly, it has two ethernet ports. secondly, it automatically chose an IP address. I did no setting up; just plug and play.

06/08/2007 07:23
naturally, it did not like the ip addy you gave it, so it chose 21

06/08/2007 07:23
I cannot see (at first look) how to change its mind on this

wellhograham 06/08/2007 07:24
I doubt whether IT chose 21. It's probably set up to "DHCP" which means it shouts on our network "who am I" and our router gave it that number. You need to say "manual IP" not "via DHCP" and the boxes in which it can be changed will be activated

If you have a DHCP server on your network, newly installed systems will shout out "please give me an address". A great system - works well for individual user's machines (client systems), but isn't recommended for servers. Client machines on our HQ network are allocated in the range 192.168.200.2x, and on the Well House Manor network 192.168.200.8x, with the next number in sequence being issued. As a pooling system where, over time, a lot of machines will connect for just a few days it's brilliant, but as a long term solution for servers it would be utterly impractical as clients had to search for "today's IP address" for the server.

So - an earlier request for a static IP address within our network, and the decision to have the new machine sidestep the default system set up to provide easy network numbering and go this something manual, is correct for the server.
(written 2007-08-06)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

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  [1945] Summary - Apache httpd build on Linux - (2008-12-14)
  [2080] Using ApacheBench and jconsole to test and monitor Tomcat - (2009-03-14)
  [2096] Where is my new Apache httpd installed - (2009-03-22)
  [2184] Choosing the right version of Java and Tomcat - (2009-05-16)
  [2520] Global and Enable - two misused words! - (2009-11-30)
  [3426] Automed web site testing scripted in Ruby using watir-webdriver - (2011-09-09)
  [4437] Adding a PHP build option, rotating an image based on camera data, and a new look at thumbnails in PHP - (2015-02-22)

A199 - Web Application Deployment - Additional Linux Administration
  [476] May I be politically incorrect? - (2005-10-25)
  [1774] What is my real and my effective ID? [Linux] - (2008-08-27)
  [2232] Why sendmail one way, and pop3 the other? - (2009-06-12)

A191 - Web Application Deployment - Installing Linux
  [705] Disc Partitioning - (2006-04-30)
  [1288] Linux run states, shell special commands, and directory structures - (2007-08-03)
  [3632] What is Make? - (2012-03-02)

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Some other Articles

An example of Java Inheritance from scratch
Weymouth - Sunny Summer Sunday afternoon
DHCP automatic IP address v Static IP
Day trip to Weymouth
Badges, Breakfasts and Trigger
Pure Perl
Work and play at Well House Manor - Football and Shell Shortcuts
A wasted evening?
An example of Java Inheritance from scratch

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