suvenk:
I have been using your library and webserver examples for the enc28j60 and they work great. Thank you for your work.
My idea is to use a microSD breakout board with the enc28j60, read files from the sd card and send them over ethernet.
I have been using this > EmbeddedMarket.com
and >EmbeddedMarket.com
Using the simplified library(Simon Monk's) I can read from the sd card and send files over the ethernet.
However there are a few problems:1.With Simon Monk's library the size of the files that can be sent is limited by the buffer size. To send the contents of the buffer I have to use the e.respond(); which closes the connection to the client and no more data can be sent.
Wow, there are a lot of companies that assembles ENC28J60 modules. I really need to buy more modules to test compatibility! If do you know people at these companies and you think they can give me one board (free) for testing, please contact me via direct message!
Actually, my library also have this limitation. I need to implement the calculation of TCP packet number so we can send more than one packet per connection. Now I can't do it because I'm working on TCP client-side (3-way handshake), but it is in the roadmap.
suvenk:
2. With your library if I only write this one line #include <SD.h> and make no other additions to the sketch the webserver example stops working (the board replies to pings but if i open the address in a browser it just keeps waiting). I assume the problem is a buffer overrun.
It looks like a memory issue (when you include SD library, it uses more RAM and ATMega can't store all the request info). Please try to do a light request, using wget or curl.
suvenk:
Regarding this I have a few questions I will be thankful if you can help.
Is it possible fill the buffer with chars and send the contents of the buffer to the client without closing the connection?
To explain further : Read single chars from the file on sd card > fill the buffer with these chars > send the packet when the buffer is full > continue reading from file and begin filling buffer again > repeat till the whole file is sent.If we can implement this, we can have fully functional web servers working off the arduino+enc28j60.
Hoping you can help me with this. Bravo for the good work again !!
For now we can't do it. But, as I said, it is a known limitation and is planned to be removed soon. 
Thanks for using and helping the project!