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carp(4) consistently omits the word "netmask" in its ifconfig examples.
Here's a patch to correct it.

--
stephen.marley@cl-is.com

Index: carp.4
================================================== =================
RCS file: /var/cvs/src/share/man/man4/carp.4,v
retrieving revision 1.17
diff -u -r1.17 carp.4
--- carp.4 17 May 2005 13:16:13 -0000 1.17
+++ carp.4 24 May 2005 17:06:04 -0000
@@ -124,20 +124,20 @@
.Bd -literal -offset indent
# ifconfig carp0 create
# ifconfig carp0 vhid 1 pass mekmitasdigoat 192.168.1.1 \e
- 255.255.255.0
+ netmask 255.255.255.0
# ifconfig carp1 create
# ifconfig carp1 vhid 2 pass mekmitasdigoat 192.168.2.1 \e
- 255.255.255.0
+ netmask 255.255.255.0
.Ed
.Pp
The setup for host B is identical, but it has a higher 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
+ 192.168.1.1 netmask 255.255.255.0
# ifconfig carp1 create
# ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat \e
- 192.168.2.1 255.255.255.0
+ 192.168.2.1 netmask 255.255.255.0
.Ed
.Pp
Because of the preempt option, when one of the physical interfaces of
@@ -163,10 +163,10 @@
.Bd -literal -offset indent
# ifconfig carp0 create
# ifconfig carp0 vhid 1 pass mekmitasdigoat 192.168.1.10 \e
- 255.255.255.0
+ netmask 255.255.255.0
# ifconfig carp1 create
# ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat \e
- 192.168.1.10 255.255.255.0
+ 192.168.1.10 netmask 255.255.255.0
.Ed
.Pp
The configuration for host B is identical, except the skew is on
@@ -174,10 +174,10 @@
.Bd -literal -offset indent
# ifconfig carp0 create
# ifconfig carp0 vhid 1 advskew 100 pass mekmitasdigoat \e
- 192.168.1.10 255.255.255.0
+ 192.168.1.10 netmask 255.255.255.0
# ifconfig carp1 create
# ifconfig carp1 vhid 2 pass mekmitasdigoat 192.168.1.10 \e
- 255.255.255.0
+ netmask 255.255.255.0
.Ed
.Pp
Finally, the ARP balancing feature must be enabled on both hosts: