WATSON SHDSL Operating Manual - page 22
Watson SHDSL Router
Operating Manual
Watson-SHDSL-Router-Manual.doc
Version 1.0-03
A client (host) sends out a broadcast message on the LAN requesting an IP address 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 simultaneously 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 network. 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 available for use by oth-
ers.
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 address 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 network to exchange in-
formation with PCs on the Internet. PPPoE supports the protocol layers and authentication widely
used in PPP and enables a point-to-point connection to be established in the normally multipoint ar-
chitecture of Ethernet. A discovery process in PPPoE determines the Ethernet MAC address of the
remote device in order to establish a session.
Watson SHDSL router’s Point-to-Point Protocol (PPP) currently supports four authentication proto-
cols: Password Authentication Protocol (PAP), Challenge Handshake Authentication Protocol
(CHAP), and Microsoft CHAP version 1 and 2.
PPP supports encryption facilities to secure the data across the network connection. A wide variety
of encryption methods may be negotiated, although typically only one method is used in each direc-
tion of the link. Please note that PPP encryption can only be used with MS-CHAP or MS-CHAP-V2
authentication protocols.
Also supported is the PPP Compression Control Protocol (CCP) which is responsible for configur-
ing, enabling, and disabling data compression algorithms on both ends of the point-to-point link. It is
used to signal a failure of the compression/ decompression mechanism in a reliable manner.
3-2
Revision: 2007-05-24