OMG, thats it.
Downgrade to 1.6.11 solved problem.
Thanks for your time. Y'r great!

This node is controled by Domoticz. I saw this hardware in controler without presentation name and childrens. When I turnoff this hardware in Domoticz, node doesen' reset. Log in Domo with hardware up:
2017-08-19 23:38:37.109 TCP: Reconnecting...
2017-08-19 23:38:38.109 MySensors: connected to: 192.168.0.172:5003
2017-08-19 23:38:46.940 (ethGet1) Humidity (SOL 2 Hum)
2017-08-19 23:38:47.037 (ethGet1) General/Voltage (SOL 2 Vcc )
2017-08-19 23:38:47.110 MySensors: Connection reset!
2017-08-19 23:38:47.110 TCP: Reconnecting in 30 seconds...
2017-08-19 23:38:54.939 (ethGet1) Temp (STA Temp)

IMHO connection reset concerning presentation problem.
But still I don't understand why node doesn't present name and relay childs in Domo.
Version of motherboard 1.6.19. powered by ac adapter.
At the end of before() serial printed text to debuger - befor() is ok.
I commented all lines. Save only presentation sketch name.
Setup and loop are empty.
Still the same. I'm going creazy...
All of source:

// Enable debug prints to serial monitor
#define MY_DEBUG

// Enable gateway ethernet module type
#define MY_GATEWAY_W5100

// W5100 Ethernet module SPI enable (optional if using a shield/module that manages SPI_EN signal)
//#define MY_W5100_SPI_EN 4

// Renewal period if using DHCP
//#define MY_IP_RENEWAL_INTERVAL 60000
// The port to keep open on node server mode / or port to contact in client mode
#define MY_PORT 5003
#define MY_MAC_ADDRESS 0xDE, 0xAD, 0xBE, 0xEE, 0xEE, 0xED // zarezerwowane na 192.168.0.172

// Enable inclusion mode
//#define MY_INCLUSION_MODE_FEATURE
// Enable Inclusion mode button on gateway
//#define MY_INCLUSION_BUTTON_FEATURE
// Set inclusion mode duration (in seconds)
//#define MY_INCLUSION_MODE_DURATION 60
// Digital pin used for inclusion mode button
//#define MY_INCLUSION_MODE_BUTTON_PIN  3

// Set blinking period
//#define MY_DEFAULT_LED_BLINK_PERIOD 300


#include <Ethernet.h>
#include <MySensors.h>
#include <SPI.h>



#define RELAY_1  22 
#define NUMBER_OF_RELAYS 8 // Total number of attached relays
#define RELAY_ON 1  // GPIO value to write to turn on attached relay
#define RELAY_OFF 0// GPIO value to write to turn off attached relay
/*
void before()
{
  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
    // Then set relay pins in output mode
    pinMode(pin, OUTPUT);
    digitalWrite(pin, RELAY_OFF);
    // Set relay to last known state (using eeprom storage)
    //digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
  }
}
*/
void presentation()
{
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Mega_eth", "1.0");

  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
    // Register all sensors to gw (they will be created as child devices)
    present(sensor, S_BINARY);
  }
}

void setup()
{
}

void loop()
{
}```

Sure
Part of relay code, same I use now with NRF:

#define RELAY_1  22 
#define NUMBER_OF_RELAYS 8 // Total number of attached relays
#define RELAY_ON 1  // GPIO value to write to turn on attached relay
#define RELAY_OFF 0// GPIO value to write to turn off attached relay

void before()
{
  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
    // Then set relay pins in output mode
    pinMode(pin, OUTPUT);
    digitalWrite(pin, RELAY_OFF);
    // Set relay to last known state (using eeprom storage)
    //digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
  }
}

void presentation()
{
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Mega_eth", "1.0");

  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
    // Register all sensors to gw (they will be created as child devices)
    present(sensor, S_BINARY);
  }
}```

I try to prepare GW sketch for node with relays.
I'v got problems with NRF (a lot of transmission problems) but I can use LAN for communications.
All log from node:
0;255;3;0;9;MCO:BGN:INIT GW,CP=R-NGA--,VER=2.1.1
0;255;3;0;9;MCO:BGN:BFR
IP: 192.168.0.172
0;255;3;0;9;MCO:BGN:STP
0;255;3;0;9;MCO:REG:NOT NEEDED
0;255;3;0;9;MCO:BGN:INIT OK,TSP=NA
0;255;3;0;9;Eth: connect
0;255;3;0;9;MCO:BGN:INIT GW,CP=R-NGA--,VER=2.1.1
0;255;3;0;9;MCO:BGN:BFR
IP: 192.168.0.172
0;255;3;0;9;MCO:BGN:STP
0;255;3;0;9;MCO:REG:NOT NEEDED
0;255;3;0;9;MCO:BGN:INIT OK,TSP=NA

IMHO it's a problem with initialize radio and sketch halted before Presentation procedure.
But why?

HI, I'd like to prepare node on mega+ethShield5100 without radio. Arduino 1.6.9; mysensor 2.1.1.
So I commented in the sketch line #define MY_RADIO_NRF24.
At the moment system startup with IP, but halted o the:
0;255;3;0;9;MCO:BGN:STP
0;255;3;0;9;MCO:REG:NOT NEEDED
0;255;3;0;9;MCO:BGN:INIT OK,TSP=NA
After that system restart startup procedure.
What I should change?

THX for your response. You save me a lot of evenings. So i try to create central gwEth on mega+eth5100+NRF with relays set.
HLD=High Level Design :)
Thanks a lot.

That's my first post, so Wlecome!
I'v got problems with my home automation project. I try to prepare HLD for it.
Please help me with my head of terms:
Domoticz serwer is runnig on Synology NAS (done)
GW eth<>nrf to connect with some nodes outside the home (soil, rain, wind) - gw is working fine (Promini+nrf)
Problems:

1. Is it possible to create gwEthernet on Mega2560?
2. Is it possible to use gwEthernet to connect some sensors, relays or rs485 modem?
   THX for all