Re: question about ifup and ifconfig

[Shyamal Prasad <shyamal.prasad@sbcglobal.net>]

    Ren> [deleted /etc/init.d/networkings with office/home query]
    Ren> and it works good.  my question here is: 1) is ifup/ifdown
    Ren> written in c and realized a set function of ifconfig and add
    Ren> route table?  2) how can i use ifconfig to bring up eth0 with
    Ren> dhcp?

Ren,

I suggest you 'man interfaces'. The man page has an example of how to
use the 'mapping' keyword to do exactly what you want, choose a
home/office setting to decide how to bring up the interface. I wish I
could help you more, but I don't currently use the mapping method. 

You don't use ifconfig to bring up eth0 with dhcp. You use a dhcp
client which (most likely) uses ifconfig to bring up eth0. For
example, if you really want to do this by hand, your networking script
needs to run something like 'pump -i eth0' when you decide you do want
to do dhcp.

Cheers!
Shyamal

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