User's Manual
Appendix A IP Addresses and Subnetting
B222s User’s Guide
186
Configuring IP Addresses
Where you obt ain your net work num ber depends on your particular sit uat ion. I f t he I SP or your
network adm inistrat or assigns you a block of registered I P addresses, follow t heir instructions in
select ing t he I P addresses and t he subnet m ask.
I f t he I SP did not explicitly give you an I P net work num ber, t hen m ost likely you have a single user
account and the I SP will assign you a dynam ic I P address when t he connect ion is established. I f this
is t he case, it is recom m ended t hat you select a net w ork num ber from 192.168.0.0 to
192.168.255.0. The I nt ernet Assigned Num ber Aut horit y (I ANA) reserved t his block of addresses
specifically for privat e use; please do not use any ot her num ber unless you are t old ot herw ise. You
m ust also enable Network Address Translation ( NAT) on t he LTE Device.
Once you have decided on the net work num ber, pick an I P address for your LTE Device t hat is easy
to rem em ber ( for instance, 192.168.1.1) but m ake sure t hat no ot her device on your net work is
using t hat I P address.
The subnet m ask specifies t he net work num ber port ion of an I P address. Your LTE Device will
com pute the subnet m ask autom at ically based on t he I P address that you ent ered. You don't need
to change t he subnet m ask com put ed by the LTE Device unless you are instruct ed t o do ot herw ise.
Private IP Addresses
Every m achine on t he I nternet m ust have a unique address. I f your net works ar e isolat ed from the
I nt ernet ( running only bet w een two branch offices, for exam ple) you can assign any I P addresses t o
the host s without problem s. However, t he I nternet Assigned Num bers Aut horit y ( I ANA) has
reserved the following t hree blocks of I P 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 obt ain your I P address from t he I ANA, from an I SP, or it can be assigned from a private
network. I f you belong to a sm all organizat ion and your I nt ernet access is t hrough an I SP, t he I SP
can provide you wit h t he I nternet addresses for your local networks. On the other hand, if you are
par t of a m uch larger organization, you should consult your net w ork adm inistrat or for t he
appropriate I P addresses.
Regardless of your part icular situat ion, do not creat e an arbit rar y I P address; always follow t he
guidelines above. For m ore inform at ion on address assignm ent , please refer t o RFC 1597, Address
Allocation for Privat e I nt ernets and RFC 1466, Guidelines for Managem ent of I P Address Space.
13 255.255.255.248 ( / 29) 8192 6
14 255.255.255.252 ( / 30) 16384 2
15 255.255.255.254 ( / 31) 32768 1
Table 84 16- bit Network Num ber Subnet Planning (continued)
NO. “BORROWED”
HOST BITS
SUBNET MASK NO. SUBNETS
NO. HOSTS PER
SUBNET