ok maybe I ll just back up an present how i chronically settle this kind of 
issue. maybe there are better ways, but ssomewhere in the mix you ll find the 
answer.

http://www.sun.com/bigadmin/faq/indexNet.html has lots of FAQ s of various ages 
and level of complexity if youa re interested

1. Is there a link light (often green and flashing if there is traffic) at both 
the ethernet card in your comp and at the switch/router/modem that your comp 
directly connects to.
    -establishs the presence of functional Physical layer ie. working Enet 
ports and wire.

2. gotta be su for most of this stuff:
bash-3.2$ ifconfig -a
bash: ifconfig: command not found
bash-3.2$ su
Password: 

3. do I have a working driver? ( breaking up the ifconfig output with comments 
here.)

============
# ifconfig -a

=============Kernel has install networking modules for IPv4
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 
index 1
        inet 127.0.0.1 netmask ff000000 
=============


=============I have an interface that is --  tcge0  Yay!
=============I have an IP address (inet 192.168.0.2) and mask (netmask 
255.255.255.0 = ffffff00), Yay!

tcge0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2
        inet 192.168.0.2 netmask ffffff00 broadcast 192.168.0.255
        ether 0:c:6e:60:7e:75 

=============Kernel has installed networking modules for IPv6
lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 
index 1
        inet6 ::1/128 
==============

4. so to recap
    Do I have Physical and Link layers (good wire and ports)
    Do I have Network and Transport layers (kernel modules, ports drivers, 
TCP/IP numbers)
    Fianlly, do I have a good software layer (does ping to a numerical address 
work, does ping to a named address work)

Hope this will be helpful in getting you started, you can use the log files, 
the command prtconf -D to look for your driver name, the command prtdiag to 
look for your ethernet card/mb chip.

SGK
 
 
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