OpenVPN 2.0 HOWTO-方式和网络规划篇(翻译)

原文:http://openvpn.net/howto.html
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Determining whether to use a routed or bridged VPN
See FAQ for an overview of Routing vs. Ethernet Bridging. See also the
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Ethernet Bridging page for more notes and details on bridging.
Overall, routing is probably a better choice for most people, as it is more efficient and easier to set up (as far as the OpenVPN configuration itself) than bridging. Routing also provides a greater ability to selectively control access rights on a client-specific basis.
I would recommend using routing unless you need a specific feature which requires bridging, such as:
the VPN needs to be able to handle non-IP protocols such as IPX,
you are running applications over the VPN which rely on network broadcasts (such as LAN games), or
you would like to allow browsing of Windows file shares across the VPN without setting up a Samba or WINS server.
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Numbering private subnets
Setting up a VPN often entails linking together private subnets from different locations.
The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets (codified in RFC 1918):
10.0.0.0 10.255.255.255 (10/8 prefix)
172.16.0.0 172.31.255.255 (172.16/12 prefix)
192.168.0.0 192.168.255.255 (192.168/16 prefix)
While addresses from these netblocks should normally be used in VPN configurations, it's important to select addresses that minimize the probability of IP address or subnet conflicts. The types of conflicts that need to be avoided are:
conflicts from different sites on the VPN using the same LAN subnet numbering, or
remote access connections from sites which are using private subnets which conflict with your VPN subnets.
For example, suppose you use the popular 192.168.0.0/24 subnet as your private LAN subnet. Now you are trying to connect to the VPN from an internet cafe which is using the same subnet for its WiFi LAN. You will have a routing conflict because your machine won't know if 192.168.0.1 refers to the local WiFi gateway or to the same address on the VPN.
As another example, suppose you want to link together multiple sites by VPN, but each site is using 192.168.0.0/24 as its LAN subnet. This won't work without adding a complexifying layer of NAT translation, because the VPN won't know how to route packets between multiple sites if those sites don't use a subnet which uniquely identifies them.
The best solution is to avoid using 10.0.0.0/24 or 192.168.0.0/24 as private LAN network addresses. Instead, use something that has a lower probability of being used in a WiFi cafe, airport, or hotel where you might expect to connect from remotely. The best candidates are subnets in the middle of the vast 10.0.0.0/8 netblock (for example 10.66.77.0/24).

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