[44net] Tunnel keep allive

So with Brians "pressure" on me (HI) i think i have found the problem ... it it the tunnel keep alive and now the questions 1)Does it necessary to turn it on ? 2) why this uses source address of amprGW and destination of my local address maybe its a a bug in the Mikrotik tunnel ? what protocol keep alive uses ? is there anyone else here with mikrotik that have a keep alive open and know if he get same errors from AMPGW ? I have changed the keep alive timing from every 10 to 610 seconds and the errors reduced to 2 every 15 minutes from about 100 Ronen - 4Z4ZQ