Table of Contents
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Chapter 6 LAN Setup
Subnet Mask
The subnet mask specifies the network number portion of an IP address. Your Device 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 Device unless you are instructed to do otherwise.
DHCP
DHCP (Dynamic Host Configuration Protocol) allows clients to obtain TCP/IP configuration at start-
up from a server. This Device has a built-in DHCP server capability that assigns IP addresses and
DNS servers to systems that support DHCP client capability.
DHCP Relay
You can also configure the Device to relay client DHCP requests to a DHCP server and the server's
responses back to the clients.
RIP
RIP (Routing Information Protocol) allows a router to exchange routing information with other
routers.
Multicast and IGMP
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1 recipient)
or Broadcast (1 sender - everybody on the network). Multicast delivers IP packets to a group of
hosts on the network - not everybody and not just 1.
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish membership
in a Multicast group - it is not used to carry user data. There are two versions 1 and 2. IGMP version
2 is an improvement over version 1 but IGMP version 1 is still in wide use.
DNS
DNS (Domain Name System) maps a domain name to its corresponding IP address and vice versa.
The DNS server is extremely important because without it, you must know the IP address of a
computer before you can access it. The DNS server addresses you enter when you set up DHCP are
passed to the client machines along with the assigned IP address and subnet mask.
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P-870HNU-51b User's Guide
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Troubleshooting
