The NIC which has two IP addressses is not active always

Solution Unverified - Updated -

Issue

  • RHEL5 server has one Network Interface card with two IP addresses (eth0 and eth0:0); when it changes its network the eth0:0 address goes "inactive", but in both positions eth0 is "active".
    We need also eth0:0 be network sensitive, i.e. when we are in 1st network eth0 active, in 2nd network eth0:0 be active.
    Before a general electrical failure we had experienced it was working well.

Environment

  • Red Hat Enterprise Linux (RHEL) 5

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