VisionNet ADSL 201ER, User Manual

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DMZ:
DMZ is an acronym for demilitarized zone. It is a common area between two different networks, such as
the Internet and a secure private network. When enabled, all traffic initiated from the Internet to the
201ER will be directed to 1 defined IP address on the LAN. Some companies prefer, for security reasons,
to use a DMZ to locate secure servers that will be accessed by outside trusted entities instead of placing
those servers on their private network. That way they can limit the protocols that can be used to access
their private network, but still share information such as sales leads, client records or inventory
information. The servers located on the DMZ are more secure than if they were directly on the Internet.
DMZ is also used for Internet Gaming applications.
DHCP Relay:
DHCP stands for Dynamic Host Configuration Protocol. In addition to the DHCP server feature, the
201ER is enhanced to support the DHCP relay function. When it is configured as DHCP relay, it is
responsible for forwarding the requests and responses negotiated between the DHCP clients and the
remote DHCP server.
IGMP Proxy:
The IGMP Proxy mechanism was added to the Unidirectional Link Routing feature to permit hosts that
are not directly connected to a downstream router to be able to join a multicast group sourced from an
upstream network.
DNS Proxy:
When enabled, the 201ER acts as a DNS server for internal clients. When disabled, the user must enter
DNS addresses within the devices TCP/IP properties.
PPP Reconnect on WAN Access:
If you entered a disconnect timeout value in the Quick Start or WAN menu, the PPP session will connect
upon a URL request. If the PPP reconnect on WAN access was enabled and you enter a URL, you
establish a PPP session.
PPP Half Bridge:
Allows the modem to authenticate to the PPP server and hand off a public IP address to the PC.
IGMP:
Internet Group Management Protocol (IGMP) was primarily designed for hosts on multi-access networks
to inform locally attached routers of their group membership information. IGMP allows hosts to
communicate their desired group memberships to their local queries router to receive any datagram
’
s
sent to this router and targeted to a group with a specific IP multicast address.