sepp01:
But i nót understand how i have to upload this file...
- Connect the Arduino as ISP programmer to your Nano
- Tools > Board > ATmega328P 16MHz, 8 Analog Inputs, Ariadne Bootloader
- Tools > Programmer > Arduino As ISP
- Tools > Burn Bootloader
- Wait for the Burn Bootloader process to finish successfully
- Disconnect the Arduino as ISP from your Nano
- Connect the W5100 Ethernet controller to your Nano (this is necessary even when you are uploading over USB).
- Connect your Nano to your computer using a USB cable
- File > Examples > NetEEPROM > WriteNetworkSettings
- Edit the WriteNetworkSettings sketch according to your network configuration
- Tools > Port > select the COM port of your Nano
- Sketch > Upload
sepp01:
If i uploeaded like any sketch then i think will be overwritet if i upload after any other sketch
No, because it writes the network settings to EEPROM. EEPROM is not overwritten when you do an upload via USB or TFTP. It will be overwritten if you do a Tools > Burn Bootloader or a Sketch > Upload Using Programmer. You do need to make sure that any other sketches don't write to the EEPROM used to store the network configuration settings: 0-26 for network settings and 27-63 for the password used in the EthernetReset library.