Verify that your VMware appliance host machines deny IPv6 router autoconf settings unless necessary.

About this task

The autoconf setting controls whether router advertisements can cause the system to assign a global unicast address to an interface.

Procedure

  1. Run the # grep [01] /proc/sys/net/ipv6/conf/*/autoconf|egrep "default|all" command on the VMware appliance host machines to verify that they deny IPv6 router autoconf settings.

    If the host machines are configured to deny IPv6 router autoconf settings, this command will return values of 0.

    /proc/sys/net/ipv6/conf/all/autoconf:0
    /proc/sys/net/ipv6/conf/default/autoconf:0 

    If the host machines are configured correctly, no further action is necessary.

  2. If you need to configure a host machine to deny IPv6 router autoconf settings, open the /etc/sysctl.conf file in a text editor.
  3. Check for the following entries.
    net.ipv6.conf.all.autoconf=0
    net.ipv6.conf.default.autoconf=0

    If the entries do not exist or if their values are not set to zero, add the entries or update the existing entries accordingly.

  4. Save any changes you made and close the file.