Securing Xen's Virtual Network
From a security standpoint, there are two aspects of Xen networking that bear mentioning. First, we want to make sure that the users can't pretend to be someone they're not. This is addressed by specifying an IP address and enabling the antispoofing rules. Second, we want to protect the dom0 while letting traffic through to the domUs. This is easily handled by appropriate iptables rules.
Specifying an IP Address
The antispoofing rules use iptables to ensure that the Xen box will drop packets that don't match the expected address for the vif that they're coming from, thus protecting your network from a rogue domU. The network scripts set this up using iptables to add a rule to the FORWARD chain allowing packets that ...
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