network not responding on proxmox 3.0

Hi ,

I am using proxmox 3.0 i am having 4 interface eth0 as vmbr0 and eth1, eth2, eth3 as vmbr1 in bond.

frequently i am not able to connect to proxmox server and vm's one restarted the network it start working. and i am not able to ping localhost host also i am getting "connect: No buffer space available"
changed some sysctl variables also

net.ipv4.neigh.default.gc_interval = 3600
net.ipv4.neigh.default.gc_stale_time = 3600
net.ipv4.neigh.default.gc_thresh3 = 4096
net.ipv4.neigh.default.gc_thresh2 = 2048
net.ipv4.neigh.default.gc_thresh1 = 1024

syslog error:

Mar 18 16:00:05 proxmox1 kernel: __ratelimit: 3705 callbacks suppressed
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:05 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: __ratelimit: 3317 callbacks suppressed
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.
Mar 18 16:00:10 proxmox1 kernel: Neighbour table overflow.



regards,
asaguru