CentOS - Aug 2013 - Setting Up LVS to Load Balance DNS

Greetings, all:

OS: CentOS 6.4 x86_64
Kernel: 2.6.32-358.14.1

I could use some assistance with setting up pulse to load balance my dns
servers. I've configured tcp and udp port 53 with the piranha gui, set up
arptable rules on the real servers and added the virtual ip to the bond0
interface on the real servers, but I'm still having no luck in getting
things going. A dig against the virtual ip address simply times out and
ipvsadm shows no servers under the UDP connection for the virtual IP I
defined in lvs.cf. Nanny also complains in /var/log/messages like so:

READ to x.x.x.x timed out

I've attached my lvs.cf and sysctl.conf files for the lvs server and real
dns servers. Any help or nudges in the right direction would be greatly
appreciated!

Thanks.

--

lvs.cf:
serial_no = 56
primary = 10.100.9.40
service = lvs
backup_active = 1
backup = 10.100.9.41
heartbeat = 1
heartbeat_port = 539
keepalive = 6
deadtime = 18
network = direct
debug_level = NONE
monitor_links = 1
syncdaemon = 1
syncd_iface = eth0
syncd_id = 0
virtual ns1 {
     active = 1
     address = 10.100.9.224 eth0:2
     vip_nmask = 255.255.255.0
     port = 53
     use_regex = 0
     load_monitor = rup
     scheduler = wlc
     protocol = tcp
     timeout = 6
     reentry = 15
     quiesce_server = 0
     server ns1a {
         address = 10.100.9.221
         active = 1
         weight = 1
     }
     server ns1b {
         address = 10.100.9.222
         active = 1
         weight = 1
     }
}
virtual ns1 {
     active = 1
     address = 10.100.9.224 eth0:2
     vip_nmask = 255.255.255.0
     port = 53
     send = "\n"
     use_regex = 0
     load_monitor = rup
     scheduler = wlc
     protocol = udp
     timeout = 6
     reentry = 15
     quiesce_server = 0
     server ns1a {
         address = 10.100.9.221
         active = 1
         weight = 1
     }
     server ns1b {
         address = 10.100.9.222
         active = 1
         weight = 1
     }
}

/etc/sysctl.conf (LVS):
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 1

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Promote secondary IPs (virtual) upon failover
net.ipv4.conf.all.promote_secondaries = 1

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# Disable netfilter on bridges.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

# Controls the maximum size of a message, in bytes
kernel.msgmnb = 65536

# Controls the default maxmimum size of a mesage queue
kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296

# Force nfs lock daemon to a set port
fs.nfs.nlm_udpport=35001
fs.nfs.nlm_tcpport=35001

/etc/sysctl.conf (Real Server):
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# Disable netfilter on bridges.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

# Controls the default maxmimum size of a mesage queue
kernel.msgmnb = 65536

# Controls the maximum size of a message, in bytes
kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296

# Force nfs lock daemon to a set port
fs.nfs.nlm_udpport=35001
fs.nfs.nlm_tcpport=35001