Appendix B IP Addresses and Subnetting
VMG1312-B Series User’s Guide
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Configuring IP Addresses
Where you obtain your network num ber depends on your particular sit uation. I f the I SP or your
net work adm inistrator assigns you a block of registered I P addresses, follow t heir inst ruct ions in
selecting the I P addresses and the subnet m ask.
I f t he I SP did not explicitly give you an I P net work num ber, then m ost likely you have a single user
account and t he I SP will assign you a dynam ic I P address when t he connection is established. I f t his
is the case, it is recom m ended that you select a network num ber from 192.168.0.0 t o
192.168.255.0. The I nternet Assigned Num ber Authority (I ANA) reserved t his block of addresses
specifically for private use; please do not use any ot her num ber unless you are told otherwise. You
m ust also enable Net work Address Translation ( NAT) on the Device.
Once you have decided on the network num ber, pick an I P address for your Device that is easy t o
rem em ber ( for inst ance, 192.168.1.1) but m ake sure t hat no other device on your net work is using
that I P address.
The subnet m ask specifies the network num ber port ion of an I P address. Your Device will com pute
the subnet m ask aut om atically based on t he I P address t hat you entered. You don't need to change
the subnet m ask com puted by t he Device unless you are inst ruct ed t o do ot herwise.
Private IP Addresses
Every m achine on t he I nt ernet m ust have a unique address. I f your networ ks are isolat ed from t he
I nternet (running only betw een t wo branch offices, for exam ple) you can assign any I P addr esses t o
the host s wit hout problem s. However, the I nt ernet Assigned Numbers Aut hority (I ANA) has
reserved the following three blocks of I P addresses specifically for private net works:
• 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 obt ain your I P address from the I ANA, from an I SP, or it can be assigned from a pr ivat e
net work. I f you belong to a sm all organizat ion and your I nternet access is through an I SP, the I SP
can provide you w ith t he I nt ernet addresses for your local net works. On t he other hand, if you are
part of a m uch larger organizat ion, you should consult your net work adm inist rator for the
appropriat e I P addr esses.
Regardless of your part icular sit uation, do not create an arbitrary I P address; always follow t he
guidelines above. For m ore inform ation on address assignm ent , please refer t o RFC 1597, Address
Allocation for Privat e I nternet s and RFC 1466, Guidelines for Managem ent of I P Address Space.
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