Network goes down after running ifup em3

Solution Unverified - Updated -

Issue

  • Experiencing a strange network issue with RHEL 6.3 when I try to add in a custom ifcfg-xxx file. When following file is created for a new interface, it kills networking across the entire host:
    DEVICE=em3
    BOOTPROTO=static
    HWADDR=AA:AA:AA:AA:AA:AA
    NM_CONTROLLED=no
    ONBOOT=yes
    TYPE=Ethernet
    IPADDR=xx.xx.xx.yy
    GATEWAY=yy.yy.yy.yy
    NETMASK=255.255.255.0

After creating this file, running ifup em3 kills the interface on em1 (the primary interface for the system).

Environment

  • Red Hat Enterprise Linux 6.3

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