On 2012-11-29 14:07, dweimer wrote:
On 2012-11-29 12:53, Fleuriot Damien wrote:
On Nov 29, 2012, at 6:43 PM, dweimer <dwei...@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.
The behavior definitely changed going from VirtualBox to VMWare, the
only change in my configuration was the IP addresses to match the home
network. However now I can talk to the carp interface form other
machines, but they receive two response one from each of the test
systems. TCPDUMP shows that they are each seeing the others broadcasts,
but for some reason they are both running as MASTER. If you run a
DOWN/UP on the interface, it briefly shows as BACKUP before switching to
MASTER. I tried with both /24 subnet of my home network, and setting
the carp0 interface to /32, both behaved the same. Any one have any
other ideas, as to whether this comes down to a Virtual Network Issue,
or a setup issue on my part.
--
Thanks,
Dean E. Weimer
http://www.dweimer.net/
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