Softlayer的机房，可以说是美国最豪华顶级的机房了。拥有softlayer的服务器，那是多么值得高兴的事情。Softlayer服务器的IP有Static IP和Portable IP区别。www.ctohome.com简单的解释下： Portable IP就是我们常见的IP段。有网关，子网掩码，广播地址 3个IP浪费，无法真正利用他们来做网站。而 Static IP 可以免去网关，子网掩码，广播地址3个IP浪费，让你可用的IP最大化。比如/29 Portable IP 可用IP是5个，而Static IP可用IP是8个。 根据softlayer的说法，Static IP是他们的默认方式，只有Portable IP才可以在vm/vps中使用。所以，你在申请IP的时候，要注意了，如果要做vps业务，必须申请Portable IP。

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SoftLayer currently offers 2 different types of IP blocks, Static and Portable. The different types of IP blocks are designed to be used in different ways. Below is a brief description on each type of block that is offered by SoftLayer as well as a section on using these IP addresses within a Virtual Machine.

Static IP Block

The most popular type of IP block within the SoftLayer network is the Static IP block. A Static IP block is a block of IP’s that are routed directly to a specific IP on our network. Every IP address in a Static block is usable on the server. One of the primary benefits to a Static block of IP’s is that you do not lose the first two and last IP from the block. Below is an example of a small Static IP block 192.168.0.4/30.

·192.168.0.4 – Usable Address

·192.168.0.5 – Usable Address

·192.168.0.6 – Usable Address

·192.168.0.7 – Usable Address

As this example shows, all 4 IP’s in this block would be available to the server, while with a potable block, only a single IP from this block would actually be useable on the server due to the network, gateway and broadcast IP’s being bound directly to the VLAN.

Portable IP Block

A SoftLayer Portable IP block is considered to be any IP block that can be used on multiple servers within a single VLAN concurrently. We currently offer two different types of Portable IP blocks. The first type of Portable IP block is a “Routed to VLAN” block. This is a Static IP block that is routed to an entire VLAN rather than a specific IP address. The other type of Portable IP Block is “Secondary on VLAN”. A Secondary on VLAN block is designed to be used within a Virtual Environment.

The primary difference between the two is the number of IP’s that are available for use. A Routed to VLAN block, like a static block provides the user access to all IPs within the block. A Secondary on VLAN block however requires that the Network, Gateway and Broadcast IP’s be bound directly to the VLAN rendering them unusable by the user. A Routed to VLAN block would be used when the user wanted to use any IP within that block on any server within the VLAN at any time. The Secondary on VLAN block is used in conjunction with a Virtual Machine. More information on Secondary on VLAN blocks is provided under the IP’s for Virtual Machines section.

When ordering a Portable IP block, by default SoftLayer will provide you with a Secondary on VLAN block. If you wish to have this block converted to a Routed to VLAN block for use on your servers within a single VLAN, please open a support ticket requesting that this block be converted to a Routed to VLAN block