Hallo,
if you ethernet card is not plumbed type
ifconfig bge0 plumb
ifconfig bge0 auto-dhcp
after you can verify with ifconfig bge0
Also if wou want reconfigure you server to use the dhcp you can "unconfigure" and reconfigure it with command sys-unconfig
Your question is not in the correct forum.
I believe you will obtain better guidance if you post it to the Network forum.
<a href="http://supportforum.sun.com/network/" target="_blank">http://supportforum.sun.com/network/</a>
That would be a better place to find out how to fine-tune all the software for a connection, particularly since your hardware does NOT seem to be a computer manufactured by Sun.