[SunHELP] Network configuration is not working properly

[sunhelp at sunhelp.org]

Hello

I added new workstation Ultra60 on our development environment. Since it was
used at other place, it had totally different ipaddress in interface. So I
used 

interface hme0 192.xxx.xxx.xx 

interface hme0 down 
interface hme0 up 


I also edited default gateway by editting 
/etc/defaultrouter 

IP address was changed, and I could telnet to other server without any
problem. 
However, when I rebooted, the workstation has set diffrent IP address. 
Moreover, OS set default gateway, that I have not wrote at
/etc/defaultrouter. 

Currently this workstaion can not join network by itself unless someone
change network configuration manually. 

I want IP address to be kept saved though the workstation were rebooted, and
gateway should be set as I edited at /etc/defaultrouter. 

How can I do it? 

Excuse me if this question is simple.