Date: Thu, 15 Mar 2007 20:45:33 +0200 From: Stefan Lambrev <stefan.lambrev@sun-fish.com> To: freebsd-net@freebsd.org Subject: Re: CARP Question Message-ID: <45F9944D.6070707@sun-fish.com> In-Reply-To: <45F97BE2.4010605@netfence.it> References: <45F97BE2.4010605@netfence.it>
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Hi,
Andrea Venturoli wrote:
> Hello.
>
> I've got two servers configured as follows:
>
> a)
> /etc/rc.conf:
> ifconfig_xl0="inet 192.168.0.2 netmask 255.255.255.0"
> ifconfig_fxp0="inet 192.168.101.4 netmask 255.255.255.0"
> cloned_interfaces="carp0 carp1 carp2 carp3"
> ifconfig_carp0="vhid 1 advskew 100 pass xxxx 192.168.101.10"
> ifconfig_carp1="vhid 2 pass yyyy 192.168.101.10"
> ifconfig_carp2="vhid 3 advskew 100 pass zzzz 192.168.0.4"
> ifconfig_carp3="vhid 4 pass wwww 192.168.0.4"
>
> /etc/sysctl.conf:
> net.inet.carp.arpbalance=1
> net.inet.carp.preempt=1
>
>
>
> b)
> /etc/rc.conf:
> ifconfig_fxp0="inet 192.168.101.1 netmask 255.255.255.0"
> ifconfig_fxp1="inet 192.168.0.3 netmask 255.255.255.0"
> cloned_interfaces="carp0 carp1 carp2 carp3"
> ifconfig_carp0="vhid 1 pass xxxx 192.168.101.10"
> ifconfig_carp1="vhid 2 advskew 100 pass yyyy 192.168.101.10"
> ifconfig_carp2="vhid 3 pass zzzz 192.168.0.4"
> ifconfig_carp3="vhid 4 advskew 100 pass wwww 192.168.0.4"
>
> /etc/sysctl.conf:
> net.inet.carp.arpbalance=1
> net.inet.carp.preempt=1
>
>
>
> With this I would expect that, being both servers online, they should
> have two MASTER and two BACKUP carp interfaces each.
> Instead, one has all MASTERs and the other all BACKUPs.
>
> a) ifconfig
> carp0: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
> inet 192.168.101.10 netmask 0xffffff00
> carp: BACKUP vhid 1 advbase 1 advskew 100
> carp1: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
> inet 192.168.101.10 netmask 0xffffff00
> carp: BACKUP vhid 2 advbase 1 advskew 0
> carp2: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
> inet 192.168.0.4 netmask 0xffffff00
> carp: BACKUP vhid 3 advbase 1 advskew 100
> carp3: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
> inet 192.168.0.4 netmask 0xffffff00
> carp: BACKUP vhid 4 advbase 1 advskew 0
>
> b) ifconfig
> carp0: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
> inet 192.168.101.10 netmask 0xffffff00
> carp: MASTER vhid 1 advbase 1 advskew 0
> carp1: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
> inet 192.168.101.10 netmask 0xffffff00
> carp: MASTER vhid 2 advbase 1 advskew 100
> carp2: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
> inet 192.168.0.4 netmask 0xffffff00
> carp: MASTER vhid 3 advbase 1 advskew 0
> carp3: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
> inet 192.168.0.4 netmask 0xffffff00
> carp: MASTER vhid 4 advbase 1 advskew 100
>
>
> Why?
>
man carp:
net.inet.carp.preempt Allow virtual hosts to preempt each
other. It
is also used to failover carp interfaces as a
group. When the option is enabled and one of
the carp enabled physical interfaces goes
down,
advskew is changed to 240 on all carp inter-
faces. See also the first example. Disabled
by default.
>
> bye & Thanks
> av.
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--
Best Wishes,
Stefan Lambrev
ICQ# 24134177
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