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=== IP conntracks ===
'''IP connection tracking should be enabled for CT0'''. For recent OpenVZ kernels (2.6.9 and later) connection tracking for CT0 is enabled by default, but it can be disabled by vzctl 4.7 and newer (because it has a negative impact on venet performance, see {{Bug|2755}}). So, make sure there is '''NO''' line like
options nf_conntrack ip_conntrack_disable_ve0=1
in <code>/etc/modules.conf</code>, <code>/etc/modprobe.conf</code>, or any file under <code>/etc/modprobe.d/</code> (such as <code>/etc/modprobe.d/parallelsvz.conf</code>). '''If there is such a line, please'''
#change <code>=1</code> to <code>=0</code>
#reboot the node.
[https://bugs.launchpad.net/ubuntu/+source/procps/+bug/84537 Launchpad]
The syntax of /etc/sysctl.conf has changed to :
<pre>net.ipv4.conf.default.forwarding=1
net.ipv4.conf.all.forwarding=1</pre>
===Enable iptables in OpenVZ 7/Virtuozzo 7===
If you use OpenVZ 7/Virtuozzo 7 and want to manage iptables through iptables-services you must disable firewalld and enable iptables:
# systemctl stop firewalld
# systemctl mask firewalld
# yum install iptables-services
# systemctl enable iptables
== How to create the container and attach network properties to it ==
# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
# service iptables save
# service iptables restart
=== Firewall ===
# iptables -A RH-Firewall-1-INPUT -s 192.168.2.0/24 -j ACCEPT
=== Test ===
