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Date:      Thu, 29 Nov 2012 14:07:09 -0600
From:      dweimer <dweimer@dweimer.net>
To:        Fleuriot Damien <ml@my.gd>
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: CARP within VirtualBox Does it =?UTF-8?Q?work=3F?=
Message-ID:  <a36ea7e237eb291f7fabf7daa7c3f8ab@dweimer.net>
In-Reply-To: <9232DDFC-F40B-4914-A92D-3B5D9C1ECE5F@my.gd>
References:  <737f4b1c8bff13850af119f917ed811c@dweimer.net> <9232DDFC-F40B-4914-A92D-3B5D9C1ECE5F@my.gd>

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On 2012-11-29 12:53, Fleuriot Damien wrote:
> On Nov 29, 2012, at 6:43 PM, dweimer <dweimer@dweimer.net> wrote:
>
>> I was trying to setup a test of CARP on two virtual machines running 
>> in VirtualBox 4.2.4r81684 I am not sure if I have something wrong with 
>> my CARP configuration or if VirtualBox just doesn't work right with 
>> it.  I can only ping the CARP interface IP address from the machine 
>> listed as MASTER, if I do an ifconfig carp0 down on the MASTER the 
>> other machine correctly switches form BACKUP to MASTER and then I can 
>> ping the interface from it but not from the Original system.
>>
>> The VirtualBox systems are both using bridged networking, and the 
>> host cannot ping the carp0 IP address but can ping the interface IP 
>> address.
>>
>> Before I go through more trouble shooting, does anyone know if CARP 
>> doesn't work with VirtualBox?
>>
>> carp configuration
>> Machine1:
>> ifconfig_em0="UP"
>> ifconfig_em0_name="LAN"
>> ipv4_addrs_LAN="10.20.190.201/16"
>> defaultrouter="10.20.111.2"
>> cloned_interfaces="carp0"
>> ifconfig_carp0="vhid 1 advskew 100 pass ReduntantCarpTest 
>> 10.20.190.203/16
>>
>> ifconfig carp0:
>> carp0 flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
>> inet 10.20.190.203 netmask 0xffff0000
>> nd6 options=29<PREFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>> carp: MASTER vhid 1 advbase 1 advskew 100
>>
>>
>> Machine2:
>> ifconfig_em0="UP"
>> ifconfig_em0_name="LAN"
>> ipv4_addrs_LAN="10.20.190.202/16"
>> defaultrouter="10.20.111.2"
>> cloned_interfaces="carp0"
>> ifconfig_carp0="vhid 1 pass ReduntantCarpTest 10.20.190.203/16
>>
>> ifconfig carp0:
>> carp0 flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
>> inet 10.20.190.203 netmask 0xffff0000
>> nd6 options=29<PREFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>> carp: BACKUP vhid 1 advbase 1 advskew 0
>>
>> FreeBSD version is 9.1RC3 on both test machines.
>
>
>
> We're using FreeBSD and CARP in virtualized environments at work,
> albeit not on VirtualBox but on Proxmox/KVM.
>
> First, I would advise replacing 10.20.190.203/16 with 
> 10.20.190.203/32
>
>
> I notice your carp0 is MASTER on machine1 with an advskew of 100 vs
> machine 2 advskew 0, same advbase.
> Confirm this is *after* you've set carp0 down on machine2.
>
> If both carps are up and machine1 with advskew 100 beats machine2
> with advskew 0, you have an additional problem.
>
>
> See if you have any more luck with the /32 address on carp0 anyway.

The documentation shows the mask matching that of the interface:
hostname="hostb.example.org"
ifconfig_fxp0="inet 192.168.1.4 netmask 255.255.255.0"
cloned_interfaces="carp0"
ifconfig_carp0="vhid 2 pass testpass 192.168.1.51/24"

This is consistent with the man page for CARP on the system as well.  
Regardless I tried with the /32 and had the same result as I did with 
the /16.  I had done various UP/DOWN on interfaces so the current MASTER 
was just the last one to have not been DOWN.  I think I might just copy 
these VMs to my VMWARE Workstation 9 install on my home PC after work 
tonight and see if the problem persists.

-- 
Thanks,
    Dean E. Weimer
    http://www.dweimer.net/



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