Bedienungsanleitung ZyXEL NBG-318S (Seite 258 von 306) (Englisch)

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Appendix C IP Addresses and Subnetting

NBG318S User’s Guide

258

Configuring IP Addresses

Where you obtain your network number depends on your particular situation. If the ISP or

your network administrator assigns you a block of registered IP addresses, follow their

instructions in selecting the IP addresses and the subnet mask.

If the ISP did not explicitly give you an IP network number, then most likely you have a single

user account and the ISP will assign you a dynamic IP address when the connection is

established. If this is the case, it is recommended that you select a network number from

192.168.0.0 to 192.168.255.0. The Internet Assigned Number Authority (IANA) reserved this

block of addresses specifically for private use; please do not use any other number unless you

are told otherwise. You must also enable Network Address Translation (NAT) on the

NBG318S.

Once you have decided on the network number, pick an IP address for your NBG318S that is

easy to remember (for instance, 192.168.1.1) but make sure that no other device on your

network is using that IP address.

The subnet mask specifies the network number portion of an IP address. Your NBG318S will

compute the subnet mask automatically based on the IP address that you entered. You don't

need to change the subnet mask computed by the NBG318S unless you are instructed to do

otherwise.

Private IP Addresses

Every machine on the Internet must have a unique address. If your networks are isolated from

the Internet (running only between two branch offices, for example) you can assign any IP

addresses to the hosts without problems. However, the Internet Assigned Numbers Authority

(IANA) has reserved the following three blocks of IP addresses specifically for private

networks:

• 10.0.0.0 — 10.255.255.255

• 172.16.0.0 — 172.31.255.255

• 192.168.0.0 — 192.168.255.255

You can obtain your IP address from the IANA, from an ISP, or it can be assigned from a

private network. If you belong to a small organization and your Internet access is through an

ISP, the ISP can provide you with the Internet addresses for your local networks. On the other

hand, if you are part of a much larger organization, you should consult your network

administrator for the appropriate IP addresses.

Regardless of your particular situation, do not create an arbitrary IP address; always follow the

guidelines above. For more information on address assignment, please refer to RFC 1597,

Address Allocation for Private Internets and RFC 1466, Guidelines for Management of IP

Address Space.

14 255.255.255.252 (/30) 16384 2

15 255.255.255.254 (/31) 32768 1

Table 114 16-bit Network Number Subnet Planning (continued)

NO. “BORROWED”

HOST BITS

SUBNET MASK NO. SUBNETS

NO. HOSTS PER

SUBNET

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