load balancing with ip or gateway?

hi dear
here you can see my configuration
ether1=192.168.100.1/24
ether2,3,4=DHCP-Client
ether2=ip2,gw2 ether3=ip3,gw3 ether4=ip4,gw4
which load balancing is correct ?

/ip route add dst-address=192.168.100.0/0 gateway=ip1,ip2,ip3 check-gateway=arp routing-mark=SUBNET-LAN
/ip route add dst-address=192.168.100.0/0 gateway=gw1,gw2,gw3 check-gateway=arp routing-mark=SUBNET-LAN

i check both of them, but only the second works for load balancing

thank you so much

the second one is really working?.. I’m surprised… I’d say that first one is correct…

but i check more and more
only second is working

I absolutelty can’t understant, how it is working )) if only your provider use proxy-arp…