ifconfig eth0 unplumb equivalent

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http://www.unix.com – ifconfig eth0 unplumb will perfectly work on solaris , but linux dont support unplumb option ..what is the correct way to remove the interface , forgive me if this topic is already discussed .. i tried this rename /etc/sysconfig/network-scripts/ifcfg-eth0 & restart the network service .. but is not helping . (HowTos)