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Chapter 5 Device Network Settings
Vantage CNM User’s Guide
82
5.3.2.3 PPTP Encapsulation
Point-to-Point Tunneling Protocol (PPTP) is a network protocol that enables secure transfer of
data from a remote client to a private server, creating a Virtual Private Network (VPN) using
TCP/IP-based networks.
PPTP supports on-demand, multi-protocol and virtual private networking over public
networks, such as the Internet.
RIP Direction RIP (Routing Information Protocol) allows a router to exchange routing information
with other routers. The RIP Direction field controls the sending and receiving of
RIP packets.
Choose Both, None, In Only or Out Only.
When set to Both or Out Only, the Vantage CNM will broadcast its routing table
periodically.
When set to Both or In Only, the Vantage CNM will incorporate RIP information
that it receives.
When set to None, the Vantage CNM will not send any RIP packets and will ignore
any RIP packets received.
By default, RIP Direction is set to Both.
RIP Version The RIP Version field controls the format and the broadcasting method of the RIP
packets that the Vantage CNM sends (it recognizes both formats when receiving).
Choose RIP-1, RIP-2B or RIP-2M.
RIP-1 is universally supported; but RIP-2 carries more information. RIP-1 is
probably adequate for most networks, unless you have an unusual network
topology. Both RIP-2B and RIP-2M sends the routing data in RIP-2 format; the
difference being that RIP-2B uses subnet broadcasting while RIP-2M uses
multicasting. Multicasting can reduce the load on non-router machines since they
generally do not listen to the RIP multicast address and so will not receive the RIP
packets. However, if one router uses multicasting, then all routers on your network
must use multicasting, also. By default, the RIP Version field is set to RIP-1.
Multicast Choose None (default), IGMP-V1 or IGMP-V2. 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. IGMP version 2 (RFC 2236) is an
improvement over version 1 (RFC 1112) but IGMP version 1 is still in wide use. If
you would like to read more detailed information about interoperability between
IGMP version 2 and version 1, please see sections 4 and 5 of RFC 2236.
Apply Click Apply to save your changes back to the Vantage CNM.
Reset Click Reset to begin configuring this screen afresh.
Table 22 Device Operation > Device Configuration > Network > WAN > WAN1/2 - PPPoE
(ZyNOS ZyWALL with two WAN ports) (continued)
LABEL DESCRIPTION