The default Openvz network setup is designed for when a server is directly connected to a switch.
If you are running OpenVZ on Xen/KVM guest, traffic goes through the Ethernet bridge on the node which is why proxy-arp is needed. By default this is disabled in /etc/sysctl.conf:
net.ipv4.conf.default.proxy_arp = 0
It’s quite rare to have the setup like this.
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