Abstract
Currently, the Linux kernel is used to implement the NetServ transport layer. Packet filters, used to intercept packets in the NetServ node, and rules, used to route them to the proper service container, are installed in the node forwarding plane by using the netfilter library through the iptables tool. This type of solution is optimal in a prototyping point of view, but could be a bottleneck in real deployment environments. In fact the packets data path is implemented in software and, not only for a packet elaboration, but also for a normal routing task, it could takes times; in terms of performances, it cannot compete with common hardware routers, making difficult to widely adopt NS in real networks. The need of having a fast data path is now solved through the integration of an OpenFlow (OF) enabled switch inside the NS architecture. The switch acts as an hardware forwarding plane for the NS node, providing wire speed for packets that only needs to be routed or partially modified.
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