vrrpd - Virtual Router Redundancy Protocol Deamon
vrrpd -i ifname -v vrid [-f piddir] [-s] [-a auth] [-p prio] [-m
ifname] [-c delta] [-nhD] ipaddr
vrrpd is an implementation of VRRPv2 as specified in rfc2338. It run in
userspace for linux. In short, VRRP is a protocol which elects a
master server on a LAN and the master answers to a ’virtual ip
address’. If it fails, a backup server takes over the ip address.
A longer answer in the rfc2338 abstract : "This memo defines the
Virtual Router Redundancy Protocol (VRRP). VRRP specifies an election
protocol that dynamically assigns responsibility for a virtual router
to one of the VRRP routers on a LAN. The VRRP router controlling the
IP address(es) associated with a virtual router is called the Master,
and forwards packets sent to these IP addresses. The election process
provides dynamic fail over in the forwarding responsibility should the
Master become unavailable. This allows any of the virtual router IP
addresses on the LAN to be used as the default first hop router by end-
hosts. The advantage gained from using VRRP is a higher availability
default path without requiring configuration of dynamic routing or
router discovery protocols on every end-host." Copyright (C) The
Internet Society (1998). All Rights Reserved.
Monitored interface functionality is useful on high availability router
or firewall platforms, where single interface failure can cause
asymmetrical routing issues.
Ideally, what is required is a method for a vrrpd process to detect a
failure of the ’other’ network interface, and lower it’s own VRRP
priority below that of the ’backup’ vrrpd process. This allows
failover to occur normally.
-h display this short inlined help
-n Don’t handle the virtual mac address
-D Go into background mode, daemonize
the interface name to run on. More than one interface can be
monitored by the one vrrpd process, a list like "eth1 eth2 eth3
eth4 eth5" is acceptable. Losing link-beat on any of these will
cause the priority of that vrrpd process to be decreased by the
specified value, or a default of 100. Note that as MII calls
are used, this implementation is limited to Fast and Gigabit
Ethernet chipsets only - 10Mbps Ethernet cards will not work.
the id of the virtual server [1-255]
-s iqxSwitch the preemption mode (Enabled by default)
set the authentification type auth=(none|pw/hexkey|ah/hexkey)
hexkey=0x[0-9a-fA-F]+ Password is a symbolic security, anybody
with a sniffer can break it. AH is a bit stronger.
Set the priority of this host in the virtual server (dfl: 100)
specify the directory where the pid file is stored (dfl:
Set the advertisement interval (in sec) (dfl: 1) -m ifname
Interface(s) to monitor for failure. Use " " for multiple
Set the delta to decrease priority by (dfl: 50)
ipaddr the ip address(es) of the virtual server
vrrpd -i eth0 -v 50 10.0.0.1
run vrrp on the interface eth0 with the virtual id 50 and 10.0.0.1 as
virtual ip address
vrrpd was written by Jerome Etienne <firstname.lastname@example.org>, it was later
improved by Alexandre Cassert <email@example.com> and David Hunter
Suggestions, bugs or questions should be directed to the Sourceforge
project at http://sourceforge.net/projects/vrrpd/
Bug reports regarding this package should be submitted to Debian using
the reportbug or bug tool.
For more information please read the documents under
/usr/share/doc/vrrpd/ : README, README.Debian FAQ and TODO.