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Prestige 2802HW(L)-Ix Support Notes
All contents copyright (c) 2007 ZyXEL Communications Corporation.
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RL (that you can specify) while you are off line.
Use WAN IP Address
Select this option to update IP Address of the host name to the WAN IP Address.
D
y
namic DNS server
auto detect IP Address
Select this option only when there are one or more NAT routers between ZyXEL
Device and DDNS server. This feature has DDNS server automatically detect
and use the IP address of the NAT router that has a public IP address.
NOTES :
The DDNS server may not be able to detect the proper IP address if there is an
HTTP proxy server between the ZyXEL Device and the DDNS server.
Use specific IP Address
Tyep the IP address of hostname. Use this if you have a static IP address.
Network Management Using SNMP
1. SNMP Overview
The
Simple Network Management Protocol
(SNMP) is an applications-layer protocol used to exchange the
management information between network devices (e.g., routers). By using SNMP, network administrators can
more easily manage network performance, find and solve network problems. The SNMP is a member of the
TCP/IP protocol suite, it uses the UDP to exchange messages between a management Client and an Agent,
residing in a network node.
There are two versions of SNMP: Version 1 and Version 2. ZyXEL supports SNMPv1. Most of the changes
introduced in Version 2 increase SNMP's security capabilities. SNMP encompasses three main areas:
1. A small set of management operations.
2. Definitions of management variables.
3. Data representation.
The operations allowed are: Get, GetNext, Set, and Trap. These functions operates on variables that exist in
network nodes. Examples of variables include statistic counters, node port status, and so on. All of the SNMP
management functions are carried out through these simple operations. No action operations are available, but
these can be simulated by the setting of flag variables. For example, to reset a node, a counter variable named
'time to reset' could be set to a value, causing the node to reset after the time had elapsed.
SNMP variables are defined using the OSI Abstract Syntax Notation One (ASN.1). ASN.1 specifies how a
variable is encoded in a transmitted data frame; it is very powerful because the encoded data is self-defining.