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Optional Type: Patch

IPv4 address promotion

Released: Jun 6, 2008     Updated: Jun 6, 2008


The kernel 2.6.14 allows the address promotion of secondary IPv4 addresses.

- === 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.

If you try to enable the feature "promote_secondaries" creating 3 addresses on the same interface (eth0) and same netmask, and during a ping to the secondary, try to delete the primary, the "promotion" fails and also the ping.

This problem is not present with a recent distribution of RedHat enterprise 5 and with the PNE LE 2.0 EAR.

Product Version

Linux Platforms 1.x


Installation Notes

Installation Notes

  1. Unzip the patch under [install_dir]/updates

    2. Install the patch CD by entering the patch CD directory and run setup_linux.

    3. This is a source only patch so you will have to build the kernel

    4. Issue a make fs and make the kernel in a configured directory.

    5. Upload the kernel and rootfs into the target and boot it up.

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