Dual NICs - When I 'ifup eth1' it replaces eth0

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http://www.unix.com – I've got an issue with a VMWare server running RHEL 6.3 that has dual E1000 NICs. I have configured the cards as I would normally do in /etc/sysconfig/network-scripts as ifcfg-eth0 and ifcfg-eth1. I can execute ifup eth0 and bring the interface up quite happily, however when I execute ifup eth1 it succeeds but the IP details are assigned to eth0 and eth1 has no IP details as shown below: Code: eth0      Link encap:Ethernet  HWaddr 00:50:56:XX:XX:XX            inet addr:X.X.X.X  Bcast:X.X.X.X  Mask:   &nbsp (HowTos)