second Ethernet port won't work until reboot????

[bbaa aaa]

We have DELL 2650 server and this server come with two Ethernet ports (eth0 
and eth1).   Redhat AS 2.1 is installed on it.  After three months first 
Ethernet port setup, I connect cable to second Ethernet port.  I use "neat" 
to do the configuration, But communication does NOT work.  I also tried 
"ifup", "ifdown" and "networt service start".  it make NO difference.  I 
need reboot server to make it work.

does anyone know why?

Thanks.

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