my question is not clear?! let me explain it in another way
I got a Sun using oracle solrais x86, solaris 10 with patches had been installed on the machine, I configued one interface net0 with 10.10.10.10 with DGW of 10.10.10.1
Now I need to change this DGW as fixed one.
and also configure net1 with IP 184.108.40.206 and DGW of 220.127.116.11
As far as i understand so far (please correct me if i'm wrong so i will remove my post)
When Your system send a packet, it find the destination IP to which it is supposed to be sent.
It checks if there are specific route to follow for that target IP, if no route is specified, then it is sent to the default Gateway.
You should set up your routes accordingly to fit your needs.
Maybe Solaris 10 offers network capabilities for setting differents types of configurations, but since it is not exactly in my area, i am not sure about what is possible or not.
In such case, the best is to get the relvant documentation (PDF or other) and read it.