Ricoh Laser MFP, User Manual

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TCP/IP environment
3. 2
SLP
Service Location Protocol (SLP) is an Internet standard network
protocol that provides a framework to allow networking
applications to discover the existence, location, and
configuration of networked services in enterprise networks,
such as printers, Web servers, fax machines, video cameras,
file systems, backup devices (tape drives), databases,
directories, mail servers, and calendars.
In order to locate services on the network, users of network
applications are required to supply the host name or network
address of the device that supplies a desired service. However,
SLP eliminates the need for a user to know the name of a
network host supporting a service. Rather, the user only needs
to supply the desired type of service and set of attributes or
keywords, which describe the service.
Based on that description, SLP also resolves the network
address of the service of the user. Administrators do not need
to help clients find new services or to remove services when
they are no longer available. SLP uses multicasting and can
work over subnet boundaries.
Configuring SLP
You can configure SLP protocol settings through Web Image
Monitor Type 104. Select
Network Settings
Æ
SLP .
• SLP Protocol : You can enable or disable SLP.
• Port Number : The port number is fixed to 427.
• Scope 1 ~ 3 : A scope is a set of services and a string used
to group resources by location, network, or administrative
category. Each scope should not be more than 32
characters.
• Message Type : You can select the outgoing SLP message
type sent to network devices. The default value is
Multicast .
• Multi Cast Radius : You can specify the maximum number
of subnets that SLP multicasts can travel across. This value
is also called the “hop count” or “time-to-live” (TTL). The
default value is 255.
• Registration Lifetime : You can define the time in seconds
before the Server Agents registration expires.
• Multicast Address : The Multicast Address value is fixed to
239.255.255.253, 224.0.1.127.
Using SLP
Once SLP enabled is checked, the network print server works
as a Service Agent and the User Agent.
Dynamic DNS (DDNS)
DNS (Domain Name System) is used for registration of domain
names and provides Host names to an IP address resolution
service. For printer devices, DNS may be utilised for printer
domain name registration, so that print server clients may refer
to the printer by its host name rather than by its IP address.
Even though a printer’s IP address is changed, all clients can
operate this printer without reconfiguration. Addressing to a
printer device by IP address is not convenient and may often go
stale if an IP address to a device is assigned dynamically via a
DHCP server. If the DHCP server can provide information about
a printer’s changing IP address to the DNS server
automatically, user convenience is increased. The printer’s
name will be used as its DNS name.
Configuring DDNS
1
Let the DHCP server provide updated information to the
DNS server.
2
Configure the same DDNS domain through Web Image
Monitor Type 104 as entered in the DNS server.
If you connect your network printer via a web browser, you
can enable this by selecting
Network Settings Æ TCP/
IP Æ Dynamic DNS Registration .
3
Set the IP assignment method of your network print server
to
DHCP and reboot the printer.
The DNS server will update its database and users can use
the printer’s name instead of its IP address.
WINS
Before Dynamic DNS was defined, DNS could only be updated
manually when DHCP servers automatically provided (or
removed) IP addresses. As a result, DNS servers often
contained obsolete listings. In response, Microsoft developed
Windows Internet Name Service (WINS) to solve this problem
for NetBIOS names.
Microsoft now recommends moving to Dynamic DNS and away
from WINS. However, many customers including Microsoft
maintain WINS systems and need devices to interoperate with
WINS. So devices must, at least for now, support WINS
interoperability to allow for dynamic NetBIOS name to IP
address registration and resolution.
WINS provides a distributed database for registering and
querying dynamic NetBIOS names to IP address mapping in a
routed network environment. This is the best choice for
NetBIOS name resolution in such a routed network because it
is designed to solve the problems that occur with name
resolution in complex Internet networks.