than you guys for the information you add to me, i made that digram in my home last night and i end up with error failed to initialize OpenGL and i saw strange things after i made change from 1eth to use two eth NIC:
i got error saying ailed to initialize OpenGL
i found i have eth0 and eth0:0
there is internal and external one
my DHCP i made in external and the internal will be fixed IP or to get IP from my DSL router DHCP.
disabling DHCP in DSL is not good idea for my case since sevral laptop accessing the internet and don't want to go through the LMCE. i have to find some other way to set up two DHCP one for DSL and another for LMCE
. otherwise i will follow you advice by changing everything to have LMCE as the only DHCP in my home
but i need to know the usage and difference between LMCE internal and external NIC