Solaris 10 route queries

Hi,

We have a Solaris 10 server that configured with 2 IP addresses (2 NIC interface) with different network segments as follows:

172.28.5.15

172.28.9.16

The defaultrouter is 172.28.5.1

When an external server with IP 172.28.9.149 trying to connect to 172.28.5.15, the return traffic is through 172.28.9.x from the Solaris 10 server instead of the defaultrouter 172.28.5.1.

Is there a way that the return traffic to go to via defaultrouter 172.28.5.1 ?

Thanks in advance.