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18.2. Major Kernel Changes 2.6.11 - 2.6.15

Refer to for a list of major changes. Some of them are highlighted below.

18.2.1. IPv4 Address Promotion

Starting with version 2.6.12 of the kernel, a new feature has been added called named address promotion. This feature allows secondary IPv4 addresses to be promoted to primary addresses. Usually when the primary address is deleted, all secondary addresses are deleted as well. If you enable the new sysctl key net.ipv4.conf.all.promote_secondaries, or one of the interface specific variants, you can change this behavior to promote one of the secondary addresses to be the new primary address.