Hi @Valentin
Sorry for the delay in my response to you. I havent been able to lay my ethernet cable yet, but I have bought a TP-Link TL-MR3020 multipurpose access point and a 3G dongle to add a temporary internet connection to the ethernet network in my grainstore.
I have had to switch to an Arduino Mega 2560 (albeit a cheaper clone), I found the single hardware serial port on the Uno was not enough (using software serial and ethernet shield together doesnt seem to be reliable at all!), and the program stability on the mega seems much better, I think I might have been having memory issues on the Uno.
You can see the status of my ntrip server here: http://rtk2go.com:2101/SNIP::MOUNTPT?NAME=ArduinoUnoRTCM
I have added details of the hardware and setup I have used in the github repository: GitHub - MattWoodhead/NTRIP_LAN_Server_for_Arduino: An NTRIP Server suitable for use with an Arduino Mega and an Ethernet shield (Note the name change from Client to Server - Doh!)