Network Functions Virtualization(NFV)

• Server Virtualization
• Storage Virtualization
• Network Virtualization

Virtualized Network Function(VNF)

tunnel

tunnel protocols:

• MPLS tunnel: for MPLS network(?)
• IP tunnel:
• Security: IPsec, TLS
• GRE/NVGRE:
• TCP/UDP tunnel:
• PPTP: for PPP on TCP
• L2TP: Level 2 Tunnel Protocol on UDP
• HTTP tunnel:

Proxy:

• HTTP Proxy (HTTP)
• Sock4/Sock5 Proxy (TCP/UDP)
• VPN (IP)

TUN and TAP

• TUN: L3 IP frames, /dev/net/tun
• TAP: L2 ethernet frames

https://www.kernel.org/doc/Documentation/networking/tuntap.txt http://en.wikipedia.org/wiki/TUN/TAP

XEN Network

每个physical NIC可以指定一个运行模式：

• Bridge: vif/MAC visible (pNIC as switch on Internet)
• Router: vif/MAC invisible, IP visible (pNIC as gateway on Internet)
• NAT: vif invisible, IP invisible (port map)

OpenStack Neutron

Neutron plugins:

• Open vSwitch(OVS): Distributed virtual switches
• Linux Bridge: linux built-in L2 switch
• Modular Layer2(ML2)

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