Watson SHDSL Router
Operating Manual
Watson-SHDSL-Router-Manual.doc
Version 1.1-07
3-2
Revision: 2012-02-15
3.1.3 Dynamic Host Configuration Protocol (DHCP)
Watson SHDSL router’s WAN connection can be configured to act as a DHCP
client. The server that assigns the router with an IP address also assigns a sub-
net mask that can be overridden if necessary.
Watson SHDSL router’s Dynamic Host Configuration Protocol (DHCP) server
makes it possible to easily add computers that are configured as DHCP clients to
the local network. It provides a mechanism for allocating IP addresses and deliv-
ering network configuration parameters to such hosts. Watson SHDSL router’s
default DHCP server is the LAN bridge.
A client (host) sends out a broadcast message on the LAN requesting an IP ad-
dress for itself. The DHCP server then checks its list of available addresses and
leases a local IP address to the host for a specific period of time and simultane-
ously designates this IP address as `taken'. At this point the host is configured
with an IP address for the duration of the lease.
The host can choose to renew an expiring lease or let it expire. If it chooses to
renew a lease then it will also receive current information about network services,
as it did with the original lease, allowing it to update its network configurations to
reflect any changes that may have occurred since it first connected to the net-
work. If the host wishes to terminate a lease before its expiration it can send a
release message to the DHCP server, which will then make the IP address avail-
able for use by others.
Watson SHDSL router's DHCP server:
Displays a list of all DHCP host devices connected to it
Defines the range of IP addresses that can be allocated in the LAN
Defines the length of time for which dynamic IP addresses are allocated
Provides the above configurations for each logical LAN connection which can
be configured and enabled/disabled separately
Can assign a static lease to a LAN PC so that it receives the same IP ad-
dress each time it connects to the network, even if this IP address is within
the range of addresses that the DHCP server may assign to other computers.
Provides the DNS server with the host name and IP address of each PC that
is connected to the LAN
Additionally, Watson SHDSL router can act as a DHCP relay, escalating DHCP
responsibilities to a WAN DHCP server.
In this case, Watson SHDSL router will act merely as a router, while its LAN
hosts will receive their IP addresses from a DHCP server on the WAN.
3.1.4 Point-to-Point Protocol over Ethernet (PPPoE)
Watson SHDSL router supports the Point-to-Point Protocol over Ethernet
(PPPoE).
PPPoE enables your local network PCs that communicate on an Ethernet net-
work to exchange information with PCs on the Internet. PPPoE supports the pro-
tocol layers and authentication widely used in PPP and enables a point-to-point
connection to be established in the normally multipoint architecture of Ethernet. A
discovery process in PPPoE determines the Ethernet MAC address of the re-
mote device in order to establish a session.