For 2021 - online Python 3 training - see ((here)).
Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.
Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Domain Forwarding - 2 ways of doing it
It's always seemed to be a real hassle to move domains and DNS service from one ISP to another, and I think that's partly because the ISP that you're leaving might not want to loose business, and partly because of necessary security checks to avoid domains being stolen. But it's lead us to some interesting situations / setups in the last couple of years.
If you visit our Opentalk domain
, you'll be taken to a DNS server in Germany that resolves to a web server with the same ISP, also in Germany. Visit pages on the domain, and the server in Germany will forward the request and grab the content from another server that we run - with a different ISP - in the USA. This is known as Web Forwarding
and can work reasonably well; on the down side, it can be a bit slow and the forwarding host may wrap the content in frames which mean that you can't bookmark / see the URL of individual pages.
Better than Web Forwarding is DNS Forwarding
, where a DNS server in one part of the world points directly to a host computer in another. Our wellho.co.uk domain
works like this; The DNS server that you'll go to if you visit the site is located (I think) in the UK, but that returns the IP address of another server, again in the USA. Access to pages on the web site then bypasses the UK system making for faster access, and bookmarkable pages without frames. (written 2005-11-29, updated 2006-06-09)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesA163 - Web Application Deployment - Network Configuration and Security 
A bolt of lightning on Multicasting - (2004-08-11) 
Security and Safety - (2004-09-03) 
Searching security holes - (2005-04-04) 
Looking up IP addresses - (2005-06-01) 
What are DHCP and DNS? - (2005-11-27) 
Heartbeat script in Perl - (2007-02-09) 
Wireless hotel tips - FTP and Skype connections failing - (2007-10-26) 
Slow boot and terminal start on Linux boxes - (2008-06-05) 
As different as night and tyres - (2008-07-18) 
Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23) 
How was my web site compromised? - (2009-02-24) 
Parallel Pinging, using Python Threads or Expect spawn lists - (2009-11-02) 
Checking all the systems on a subnet, using Expect and Tk - (2011-09-18) 
Setting up your MacBook Air as a mobile broadband router - (2013-07-07)
Some other Articles
MySQL - an FAQCrazy Day-siesMySQL - JOIN or WHERE to link tables correctly?Exciting futures - the Well House Manor projectDomain Forwarding - 2 ways of doing itDynamic Web presence - next generation web siteSnippets from GeekmasComment, please!Introduction to Object Oriented Programming
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This is a page archived from The Horse's Mouth at
the diary and writings of Graham Ellis.
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