.Dd 30 January, 2015
.Dt FREEVRRPD 8
.Sh NAME
.Nm freevrrpd
.Nd Virtual Redundancy Router Protocol Daemon
.Sh SYNOPSIS
.Nm freevrrpd
.Bk -words
.Op Fl F
.Op Fl f Ar config_file
.Op Fl c Ar chroot_directory
.Sh DESCRIPTION
.Nm freevrrpd
is a RFC2338/5798 compliant daemon. VRRP can be used with multiple
interfaces as well as multiple VRIDs. For each VRID defined in the
configuration file,
.Nm freevrrpd
creates a thread for managing a poll of one or multiple virtual IP
addresses. The daemon currently only supports IPv4 but IPv6 is being
developed.
.Pp
When
.Nm freevrrpd 
start, it reads /usr/local/etc/freevrrpd.conf file and then daemonizes
itself.  All of the options are defined in the config file. 
.Pp
.Nm freevrrpd is compatible with FreeBSD.
.Pp
Functionality includes :
.Bl -bullet -compact
.It
Support of multiple VRIDs
.It
State announcements are multicast using the
.Xr bpf 4
device.
.It
Changing routes and IP in 3 seconds
.It
Sending gratuitous ARP requests to clean the ARP cache of all hosts listening hosts.
.It
Election between different backup and master servers with differing priorities
.It
THe same host can be both a SLAVE and MASTER at the same time for different VRIDs.
.It
Automatic downgrade to BACKUP state if the MASTER returns to service.
.It
Support of netmasks for virtual IP addresses.
.El
.Sh CONFIGURATION
.Pp
.Nm freevrrpd
reads its configuration data from /usr/local/etc/freevrrpd.conf, or
the file specified with -f on the command line. The config file
contains keyword-argument pairs, one per line. Each VRID definition is
define by the [VRID] keyword. Lines statring with '#' and empty lines
are interpreted as comments.
.Pp
The possible keywords and their meanings are as follows (note that keywords and arguments are cas-sensitive):
.Bl -tag -width Ds
.It Cm serverid
This keyword is followed by a decimal number between 1 and 255 and represent the group identifier (Virtual Router Identifier).
.It Cm interface
This keyword is followed by an interface name where multicast VRRP annonce on the specified serverid group will be sent.
.It Cm useVMAC
Specifies wheter Virtual MAC adress (like 00:5E:00:...) is permitted.
The default is
.Dq yes .
Note that disabling useVMAC is a RFC infragment but must be necessary for some specific cases. If disabled,
.Dq sendgratuitousarp
must be enabled.
.It Cm priority
This keyword can be followed by a decimal number between 0 to 255. a priority of 255 mean a MASTER server. a priority between 0 to 254 is a BACKUP priority.
Note that 0 is the minimal BACKUP priority and 254 is the higher. If the VRID MASTER fail, tha higher BACKUP priority will become MASTER.
.It Cm addr
Specifies all Virtual IP adresses separated by commas of the corresponded VRID. a VIP syntax will be: 
.Dq xxx.xxx.xxx.xxx/yy 
or 
.Dq device:xxx.xxx.xxx.xxx/yy. 
.Dq xxx.xxx.xxx.xxx 
represent the IP adress and 
.Dq yy 
is a netmask in CIDR format. device is an optional device where VIP will be setted.
.It Cm monitoredcirctuis
Specifies whether NIC monitoring is enabled. This option use a special ioctl for getting carrier, duplex and health of the network card.
The default is 
.Dq yes .
Note that your NIC driver must support mii bus functionnality. Some old drivers cannot use this option and must be disabled.
.It Cm MCClearErrorsCount
This keyword can be followed by a decimal number that represent the number of concurrent valid checks (monitored circuits) before nberrors flag will be resetted at 0.
The default is
.Dq 3600 .
Note that the default value mean that 30 concurrent checks ok on a NIC by monitored circuits will reset the error counter for this NIC.
If a value of 
.It Cm masterscript
This keyword can be followed by a script name with an absolute path and will be executed during MASTER transition state.
.It Cm backupscript
This keyword take same argument as 
.Dq masterscript 
except that this script is executed during BACKUP transition state.
.It Cm vridsdep
This keyword can be followed by a list of VRID in decimal format separated by commas and depends from this one. If this VRID become BACKUP, all VRIDs specified will become BACKUP too.
.It Cm password
This keyword can be followed by a password for authenticate VRRP packets on a specific VRID.
Note that the password will be transmitted in clear with this method.
.It Cm AHencryption
Not implemented yet
.It Cm useIKE
Not implemented yet
.It Cm presharedkey
Not implemented yet
.Sh IMPLEMENTATION NOTES
This utility doesn't quit properly if you use the -KILL signal. If you want to stop freevrrpd, you can use kill [PID] and not kill -9 [PID], then it can delete virtual IP addresses and routes properly on shutdown.
.Sh BUGS
.Nm freevrrpd
is in active developpement, please send me bugs report and suggestions.
.Sh AUTHORS
.An Sebastien Petit Aq spe@bsdfr.org
.Sh HISTORY
first appeared in FreeBSD-4.3