My crystal ball says it thinks you have also got an Ethernet shield too but it cant tell me what type etc.
PS Ethernet cables should conform to the standards and 10 meters is nothing in terms of what they are capable of.
For very long runs you can insert repeaters or hubs.
As for the rest of your question its difficult to make much sense of it.
Maybe include the ACTUAL code your are using (but please use the code tags that look like "</>" on the toolbar.)