I got problem with configuration for multi nat. at outside using 3 isp and at inside have 3 network, 1 as server network, 2 as priority user network and 3 as normal user network.

ISP 1 for Mail server connecttion

ISP 2 for Priority User

ISP 3 for Non Priority User

with the configuration we attached at, all system running but with few problem :

1. slow connection at non priority user, dunno why but after we check tracert command the packet run through ISP 1 not going to ISP 3. But when we check nat translation tabel, all translation going to ISP 3.

2. we need to add extra feature, when ISP_2 down, nat will moved to ISP 1 ( Failover for priority user)

We need help from anyone who can help us solve this problem.

Kindest regards,

Abdon Erwin

Network Engineer

PT. DATA KREASI INDOTAMA