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Simply configure iptables on cluster nodes. Allow only ip address and ports that you need for your customers and everything else drop. Of course, you will allow full communications between cluster nodes. Outside world will see only allowed services. I got proxmox box on public ip for years and...

and what performance do you expect from single sata disk and qcow2? Did you even read wiki howtos???... http://pve.proxmox.com/wiki/Performance_Tweaks If you want some performance go for hw raid 10 with at least 10000 rpm or try ssd.

unfortunatelly there is no "minimal or NO" downtime in your setup. I also have 4 node setup running on 2.3v. and Im not hurry to update as this will by pain in the a.s and so far cluster running without problems so I will wait. Recomended scenario is make complete backup and start clear...

# smtp example iptables -t nat -A PREROUTING -i $isp -p tcp -d $isp_IP --dport 25 -j DNAT --to yourIP:25 iptables -A FORWARD -i $isp -o $lan -p tcp -d yourIP --dport 25 -j ACCEPT

Well, I did more testing and it looks like something wrong with one of nics on board. I didnt use this one before proxmox install, so this would be the real source of my problem, no cluster setup. Anyway thx.

Hi, I just trying to setup 4 nodes cluster(meantime without HA), which was not problem after reading wiki. I want ask about nodes synchronisation which creates big amount of traffics on our network infrastructure. I definitely dont expect such a multicast storm as its lead to sucessfully DOS...