3.2.2.2 System setup in Fast switching mode

PRIMECLUSTER Global Link Services Configuration and Administration Guide: Redundant Line Control Function 4.2 (for Linux)

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Chapter 3 Environment configuration

> 3.2 System Setup

> 3.2.2 Network configuration

3.2.2.2 System setup in Fast switching mode

Common settings between IPv4 and IPv6

To create backup of the physical interface settings (the "/etc/sysconfig/network-scripts/ifcfg-ethX" or "/etc/sysconfig/network/ifcfg-ethX" file), the file name must begin with names other than "ifcfg-".
(e.g. bak_ifcfg-ethX)
If the file name begins with "ifcfg-", OS might recognize the interface as an interface to be activated during system startup.

When using an IPv4 address

Define the IPv4 address (virtual IP address, physical IP address, logical virtual interface, takeover virtual IP address) and a host name in /etc/hosts file. These host names must be specified in the /etc/hosts file even if no host names but IP addresses are directly specified in environment definitions.
Before defining a virtual interface, the physical interface you are going to apply must be in active state and be sure the IPv4 address is assigned. (When the system is RHEL, in the file /etc/sysconfig/network-scripts/ifcfg-ethX, define "ONBOOT=yes" and "IPADDR=X.X.X.X" then reboot the system.)

When using an IPv6 address

Define the IPv6 address (logical virtual interface, takeover virtual IP address) and a host name in /etc/hosts file.
Before defining a virtual interface, the physical interface you are going to apply must be in active state and be sure the IPv6 link-local address is assigned. (When the system is RHEL, in the file /etc/sysconfig/network-scripts/ifcfg-ethX, define "ONBOOT=yes" and in the /etc/sysconfig/network file, define "NETWORKING_IPV6=yes" then reboot the system.)
You must start the radvd daemon on 2 or more servers running as Fast switching mode in order to set the stateless address auto-configuration. Note that when starting up radvd on multiple servers, synchronize the prefix data of the virtual interfaces defined in /etc/radvd.conf between the servers. An example of setting a /etc/radvd.conf file when using a Linux server as an IPv6 router is shown below. In addition, depending on the version of radvd, kernel parameter(net.ipv6.conf.all.forwarding=1) must be defined in /etc/sysctl.conf file. For details on this topic, see the manual of radvd.conf(5) and radvd(8).

/etc/radvd.conf

interface sha0
{
        AdvSendAdvert on;        # Sending router advertisements
        MinRtrAdvInterval 3;
        MaxRtrAdvInterval 10;      
        prefix fec0:1::0/64      # Sending Prefix fec0:1::0/64 from sha0
        {
                AdvOnLink on;
                AdvAutonomous on;
                AdvRouterAddr on;
        };
};

When setting stateless address auto-configuration against the physical interface(ethX) using Fast switching mode, start up radvd on either of the servers or provide IPv6 router on the same network. Additionally, stateless address auto-configuration on the physical interface (ethX) does not apply on the server that has kernel configuration (net.ipv6.conf.all.forwarding=1) for starting up radvd. In such case, after starting radvd, use sysctl command to reconfigure the kernel parameter. For details, refer to sysctl(8) manual.

# sysctl -w net.ipv6.conf.all.forwarding=0

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