Private Ip Addresses; Rip Setup - ZyXEL Communications ZyWALL 10 User Manual

ZyWALL 10 Internet Security Gateway
The subnet mask specifies the network number portion of an IP address. Your ZyWALL will compute the
subnet mask automatically based on the IP address that you entered. You don't need to change the subnet
mask computed by the ZyWALL unless you are instructed to do otherwise.

3.1.3 Private IP Addresses

Every machine on the Internet must have a unique address. If your networks are isolated from the Internet,
e.g., only between your two branch offices, you can assign any IP addresses to the hosts without problems.
However, the Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of IP
addresses specifically for private networks:
10.0.0.0
172.16.0.0
192.168.0.0
You can obtain your IP address from the IANA, from an ISP, or assigned from a private network. If you
belong to a small organization and your Internet access is through an ISP, the ISP can provide you with the
Internet addresses for your local networks. On the other hand, if you are part of a much larger organization,
you should consult your network administrator for the appropriate IP addresses.
Regardless of your particular situation, do not create an arbitrary IP address; always
follow the guidelines above. For more information on address assignment, please refer
to RFC 1597, Address Allocation for Private Internets and RFC 1466, Guidelines for

3.1.4 RIP Setup

RIP (Routing Information Protocol, RFC1058 and RFC 1389) allows a router to exchange routing
information with other routers. The RIP Direction field controls the sending and receiving of RIP packets.
When set to Both or Out Only, the ZyWALL will broadcast its routing table periodically. When set to
Both or In Only, it will incorporate the RIP information that it receives; when set to None, it will not send
any RIP packets and will ignore any RIP packets received.
The Version field controls the format and the broadcasting method of the RIP packets that the ZyWALL
sends (it recognizes both formats when receiving). 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, RIP direction is set to Both and the Version set to RIP-1.
3-2
- 10.255.255.255
- 172.31.255.255
- 192.168.255.255
Management of IP Address Space.
Internet Access