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- Be more informative about advbase and advskew. [1]

Browse Source 
- Fix ifconfig commands. Replace 'mekmitasdigoat' with
  'foobar'. While the former is more cool, the latter
  makes example lines shorter.

Wording by:     scottl
MFC after:	3 days
This commit is contained in:
glebius 2005-04-07 14:20:34 +00:00
parent 75b2f0b4cc
commit 18ca5d4e9f
1 changed files with 26 additions and 17 deletions
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43
share/man/man4/carp.4
View File

@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd March 23, 2005
.Dd April 7, 2005
.Dt CARP 4
.Os
.Sh NAME
@ -70,6 +70,23 @@ is the master for a virtual host, and
which is used to authenticate
.Nm
advertisements.
The
.Cm advbase
parameter stands for
.Qq advertisement base .
It is measured in seconds and specifies the base of the adverisement interval.
The
.Cm advskew
parameter stands for
.Qq advertisement skew .
It is measured in 1/256 of seconds.
It is added to the base advertisement interval to make one host advertise
a bit slower that the other does.
Both
.Cm advbase
and
.Cm advskew
are put inside CARP advertisments.
These configurations can be done using
.Xr ifconfig 8 ,
or through the
@ -127,22 +144,18 @@ configured on one physical interface and 192.168.2.y/24 on another.
This is the setup for host A:
.Bd -literal -offset indent
ifconfig carp0 create
ifconfig carp0 vhid 1 pass mekmitasdigoat 192.168.1.1 \e
255.255.255.0
ifconfig carp0 vhid 1 pass foobar 192.168.1.1/24
ifconfig carp1 create
ifconfig carp1 vhid 2 pass mekmitasdigoat 192.168.2.1 \e
255.255.255.0
ifconfig carp1 vhid 2 pass foobar 192.168.2.1/24
.Ed
.Pp
The setup for host B is identical, but it has a higher
.Cm advskew :
.Bd -literal -offset indent
ifconfig carp0 create
ifconfig carp0 vhid 1 advskew 100 pass mekmitasdigoat \e
192.168.1.1 255.255.255.0
ifconfig carp0 vhid 1 advskew 100 pass foobar 192.168.1.1/24
ifconfig carp1 create
ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat \e
192.168.2.1 255.255.255.0
ifconfig carp1 vhid 2 advskew 100 pass foobar 192.168.2.1/24
.Ed
.Pp
Because of the preempt option, when one of the physical interfaces of
@ -169,11 +182,9 @@ of 100 on the second virtual host means that its advertisements will be sent
out slightly less frequently.
.Bd -literal -offset indent
ifconfig carp0 create
ifconfig carp0 vhid 1 pass mekmitasdigoat 192.168.1.10 \e
255.255.255.0
ifconfig carp0 vhid 1 pass foobar 192.168.1.10/24
ifconfig carp1 create
ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat \e
192.168.1.10 255.255.255.0
ifconfig carp1 vhid 2 advskew 100 pass foobar 192.168.1.10/24
.Ed
.Pp
The configuration for host B is identical, except the
@ -181,11 +192,9 @@ The configuration for host B is identical, except the
is on virtual host 1 rather than virtual host 2.
.Bd -literal -offset indent
ifconfig carp0 create
ifconfig carp0 vhid 1 advskew 100 pass mekmitasdigoat \e
192.168.1.10 255.255.255.0
ifconfig carp0 vhid 1 advskew 100 pass foobar 192.168.1.10/24
ifconfig carp1 create
ifconfig carp1 vhid 2 pass mekmitasdigoat 192.168.1.10 \e
255.255.255.0
ifconfig carp1 vhid 2 pass foobar 192.168.1.10/24
.Ed
.Pp
Finally, the ARP balancing feature must be enabled on both hosts: