Using the Arduino Ethernet shield with AMICUS18 (Joint forum project?)

[HenrikOlsson]

Hi,
Just thought I'd give those with interest in this project a short update of what I've been doing.

Take a look at the following screenshot:



The screenshot itself is pretty self explainatory but I'll do a short explanation of what is happening (it's quite a bit).

At bootup the DHCP code is executed to retrieve the network parameters from the DHCP server, then the W5100 is configured with those parameters. Then the SNTP code is executed to retrieve current time from an SNTP server on the net. Then a series of DNS queries are run, looking up the IP-adress of some well known URL's. The last URL that DNS queries is the SMTP server for my email account. Once it gets that IP-adress it uses it in the SMTP code to login to my account, using authentication (no encryption just AUTH LOGIN (BASE64 encoded username and password)), and sends an email to my account - which you can see next to the serial terminal.


There is one thing I don't get though. Browsing to to the IP-adress retrieved by the DNS code gets me to the correct places in all but ONE instances, namely THIS SITE. If I PING www.picbasic.co.uk I get the same IP as my DNS code and if I run Wireshark and browse to www.picbasic.co.uk its DNS-records shows the same IP-adress but if I browse to that very same IP I do not end up here. I'm pretty sure it's not an error in my code since every other URL I've tried seems to work. It has to be something specific with where and how this site is hosted. Anyone know, and can explain, what's going on?

Anyway the DNS code currently "only" handles normal queries, not reversed or any other type, like MX etc. It does handle both direct type A responses and CNAME responses, either single or "nested". For example, the query for microsoft results in a response with no less than three CNAME records (aliases) before finally arriving at the IP-adress shown.

That's it, just wanted to show you what's going on at my end. If anyone else is doing anything cool, please tell!

/Henrik.