Define all host names and IP addresses used in a Redundant line Control Function in the /etc/hosts files of the local system.
The length of MTU cannot be modified.
Multicast IP addresses cannot be used.
An IPv6 over IPv4 tunneling interface (sitX) is not supported.
If a user individually activates or deactivates virtual interfaces registered in the cluster, the interface status monitoring feature restores them to their original state on the operation.
It is not possible to use DHCP (a server function and a client function) as the upper application.
Redundant Line Control Function must be operating on each system that performs duplicated operation by Fast switching mode.
In Fast switching mode, one virtual network is configured to the redundant transfer route. Therefore, a new network number or a subnetwork number to this virtual network is necessary.
Only one NIC interface is connectable on one network. It is not possible to connect more than one interface on the same network.
Any combination is possible for redundant NICs. When combined those of different transfer abilities, the communication ability is suppressed by the one of less transfer ability. Therefore, it is recommended to combine the same kind of NICs and to make them redundant.
In Fast switching mode, a dedicated Ethernet frame is used. Therefore, when operating VLAN (Virtual LAN), occasionally it is not possible to communicate depending on the setting of VLAN. In such a case, either stop using VLAN or change the setting of VLAN so that it becomes possible to use an optional Ethernet frame.
The interface created by SR-IOV cannot be used.
When operating the virtual interface with IPv6 addresses in the environment where the firewalld service is enabled, change the setting of IPv6_rpfilter in the /etc/firewalld/firewalld.conf file to no ("IPv6_rpfilter=no").
If the firewalld service is enabled, the virtual interface works in the default zone after the OS is restarted, depending on the OS version.
Check the zone where the virtual interface works by using the firewall-cmd --get-active-zones command.
