Hello,
i have an hardware load balancer (level one fbr 4000) connected to the mikrotik,
but if i set load balancing on "ip addresses" it doesn't work because the load balancer see only one ip (of the mikrotik!).
How can i solve this problem?

Do you suggest me to remove the load balancer and use mikrotik balancing???

Hi

It occour because you are doing NAT on you mikrotik, check it out and look if you
really need to do it at mikrotik.

I dont know fbr4000 you are using but RouterOS has some options to implement
balance:
PCC: http://wiki.mikrotik.com/wiki/PCC#Introduction
ECMP: http://wiki.mikrotik.com/wiki/ECMP_load ... masquerade
NTH: http://wiki.mikrotik.com/wiki/NTH_load_ ... masquerade

Jorge

thank you it works, but the navigation becomes very very slow...
where is the problem?

What is your hardware? Maybe your new problem is related with CPU Load. Look under system -> resources.

cpu load is about 50%, i think the problem is in the load balancer configuration...