Old ethX numbering not used when swapping network cards

This document (3687342) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Desktop 9
SUSE Linux Enterprise Server 9


When swapping network cards in SUSE Linux, old ethX identifiers will not be used for the new card. For example, if a machine has a single NIC identified as eth0 and that NIC is swapped out the new NIC will use eth1, not eth0.


This behavior is governed by the persistent device identifier set in /etc/udev/rules.d/30-net_persistent_names.rules. Contained in this file is a line for each NIC, such as:
SUBSYSTEM=="net", ACTION=="add", SYSFS{address}=="00:15:60:ed:b7:5b", IMPORT="/lib/udev/rename_netiface %k eth0"
This line maps a MAC address to an identifier. To cause a new NIC to use an old identifier, remove the old line and restart the server. After configuring the new NIC, it will use the old identifier.


This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:3687342
  • Creation Date: 20-Nov-2006
  • Modified Date:16-Mar-2021
    • SUSE Linux Enterprise Desktop
    • SUSE Linux Enterprise Server

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