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IP Addressing for Private Networks If you are designing an IP addressing scheme for your organization's internal network, you have some addressing flexibility that you would not have if you were designing a network that touches the public Internet. Some special addresses have been made available for use in private networks. The Internet Assigned Numbers Authority (IANA) in RFC 1597 (and more recently in RFC 1918) set aside specific network addresses for use in private networks in order to preserve the remaining pool of public addresses. These are:
The above addresses are not used anywhere on the public Internet. You may use them for your organization's private internal network without registration or special permission. As long as your network remains isolated from the public Internet (and from other networks that use the same addresses), the RFC1918 addresses may be shared by many organizations. Internet connectivity can still be accomplished through the use of Network Address Translation (NAT) and other techniques. There are several advantages to using the RFC 1918 addresses on your private network. An additional measure of security is provided for your network because TCP/IP data frames containing private addresses are not forwarded by backbone routers on the public Internet. Additional subnetting flexibility is available to you because you have available a much larger number of host and subnet addresses. You can, for example, dedicate an entire Class A address (or multiple Class B addresses) to your internal network. It is highly unlikely that you could procure your own publicly-registered Class A or B address at this time. There are many benefits to designing your internal network using RFC 1918 IP addresses. Give ITS Networking Services a call to see how they might be used on your network. |
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To discuss your networking requirements, email us at waltermorris3@yahoo.com OR call (408) 842-8630. |
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