User's Manual

Chapter 6 Home Networking
B222s User’s Guide
70
Subnet Mask
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.
DHCP
DHCP ( Dynam ic Host Configurat ion Prot ocol) allows client s t o obt ain TCP/ I P configurat ion at st ar t-
up from a server. This LTE Device has a built- in DHCP ser ver capability t hat assigns I P addresses
and DNS servers t o system s that support DHCP client capability.
DNS
DNS ( Dom ain Nam e System ) m aps a dom ain nam e t o its corresponding I P address and vice versa.
The DNS server is ext rem ely im port ant because w it hout it , you m ust know t he I P address of a
com puter before you can access it. The DNS server addresses you ent er when you set up DHCP are
passed t o t he client m achines along w it h t he assigned I P address and subnet m ask.
6.1.2.2 About UPnP
How do I know if I'm using UPnP?
UPnP hardware is ident ified as an icon in the Net work Connections folder ( Window s XP) . Each UPnP
com patible device inst alled on your net work will appear as a separate icon. Selecting t he icon of a
UPnP device w ill allow you t o access t he inform ation and propert ies of t hat device.
Cautions with UPnP
The autom at ed nature of NAT t raversal applicat ions in establishing t heir own services and opening
firewall port s m ay present net work security issues. Net work inform ation and configuration m ay also
be obtained and m odified by users in som e net work environm ent s.
When a UPnP device j oins a net work, it announces it s pr esence with a m ulticast m essage. For
securit y reasons, the LTE Device allows m ulticast m essages on the LAN only.
All UPnP- enabled devices m ay com m unicat e freely wit h each ot her wit hout additional configurat ion.
Disable UPnP if t his is not your int ent ion.